When Summer has left and his ruling staff been broken, as a gesture for us all to understand, then something remarkable occurs:

... Several Asian cultures, including that of the Andaman Islands, believe that humanity emerged from a bamboo stem. In the Philippine creation myth, legend tells that the first man and the first woman were split open from a bamboo stem that emerged on an island created after the battle of the elemental forces (Sky and Ocean).

In Malaysian legends a similar story includes a man who dreams of a beautiful woman while sleeping under a bamboo plant; he wakes up and breaks the bamboo stem, discovering the woman inside.

The Japanese folktale 'Tale of the Bamboo Cutter' (Taketori Monogatari) tells of a princess from the Moon emerging from a shining bamboo section. Hawaiian bamboo ('ohe) is a kinolau or body form of the Polynesian creator god Kane. 

An ancient Vietnamese legend tells of a poor, young farmer who fell in love with his landlord's beautiful daughter. The farmer asked the landlord for his daughter's hand in marriage, but the proud landlord would not allow her to be bound in marriage to a poor farmer. The landlord decided to foil the marriage with an impossible deal; the farmer must bring him a 'bamboo tree of one-hundred sections'. The benevolent god Bụt appeared to the farmer and told him that such a tree could be made from one-hundred sections from several different trees. Bụt gave the him four magic words to attach the many sections of bamboo: 'Khắc nhập, khắc xuất', which means 'put in immediately, take out immediately'. The triumphant farmer returned to the landlord and demanded his daughter. The story ends with the happy marriage of the farmer and the landlord's daughter ...

In general the structure with a hard outer shell containing good soft things is recognizable from the bivalve which Raven found half buried in the primeval long sandy beach. A woman inside is necessary or else there will no births (no mankind).

Raven has a raucous voice because he cannot drink, but that is not the whole truth:

... As you know the Raven has two voices, one harsh and strident, and the other which he used now, a seductive, bell-like croon which seems to come from the depth of the sea, or out of the cave where winds are born. It is an irresistable sound, one of the loveliest in the world. It wasn't long before first one and then another of the little shell-dwellers emerged from the shell. Some scurried back when they saw the Raven, but eventually curiosity overcame their caution and all of them had crept or scrambled out.

Very strange creatures they were: two legged like Raven, but otherwise very different. They had no feathers. Nor fur. They had no great beak. Their skin was pale, and they were naked except for the dark hair upon round, flat-featured heads. Instead of strong wings like raven, they had thick stick-like arms that waved and fluttered constantly. They were the first humans. For a long time Raven amused himself with these new playthings. Laughing as they explored with wonder a much expanded world. Sometimes they helped each other, sometimes they fought over something they had found. Raven even taught them some tricks, but soon he became tired of their ceaseless activity. For one thing, they were so helpless out in the world. They needed shelter from the sun and the rain. They were so fearful and seemed so small. And there were no girls among them, only boys. Raven was about to shove these tired, demanding and annoying creatures back into their shell and forget them, when, as so often happens with Raven, he had an idea for some fun.

Raven began to search for the girls. For it is the way of things in the world that there are both males and females of every creature. Somewhere there must be girls. Raven searched and searched. Under logs and behind rocks, he looked. But he could not find the hiding place of the first girls. But as he searched, the tide was going out, and as it reached its lowest, the Raven spotted some giant Chitons clinging to the rocks. These giant shell fish had but one shell, fastened tightly to the rocks with huge soft lips around their edges. Raven pried one loose with his beak. And there inside was a girl. He pried off another, and another, and another in each was a girl. They were very similar to the creatures he had found in the clamshell, but more like the Chiton, softer and rounder, in contrast to the hard shell and strong muscles of the clam. And these were just as frightened of the Raven. He gathered them onto his back with difficulty, and brought them to the boys he had found in the clamshell.

Raven was expecting the boy creatures to be very happy he had found the girl creatures, but to his surprise. They were frightened of them and some even ran back into the Giant clamshell to hide. The girl creatures were just as shy and huddled together watching the males with fearful and curious eyes. Both the boy and girl creatures seemed very modest and sought to cover their bodies with strips of kelp and woven sea weed from the shore ...

The chitons are female in contrast to the male bivalves, this myth states. Sun has 2 residences during his year, while Moon has 8 periods we can read in the C text:

"Chitons have a dorsal shell which is composed of eight separate shell plates or valves." (Wikipedia)

 

Could the oval in Ca7-24 be a chiton? Perhaps not, because the mama type of glyph (with only 4 dorsal plates) is more similar: