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The other corresponds to the subintestinal vein and the ventral vessel of the worms. With the formation of these organs the progressive development of the Ascidia comes to an end, and degeneration sets in.
In the male the testicles pass out of the ventral cavity, and penetrate by the inguinal canal into a sac-shaped fold of the outer skin. The various mammals bring before us the successive stages of this displacement. In the elephant and the whale the testicles descend very little, and remain underneath the kidneys. In many of the rodents and carnassia they enter the inguinal canal.
Speaking of the rib, I may add to what I have said about the development of the skeleton, that the number of ribs is just the same in man and woman. In both of them the ribs are formed from the middle germinal layer, and are, from the phylogenetic point of view, lower or ventral vertebral arches.
In the Corycaeidae, Claus found all the ventral ganglia fused together into a single broad mass, and in the Calanidae a long ventral chain of ganglia, the former, therefore, in this respect resembling the Spider Crabs and the latter the Lobster; but no one would dream on this account of supposing that there was a relationship between the Corycaeidae and the Crabs, or the Calanidae and the Lobsters.
The organism which has issued from the egg is a boat-shaped body with a fin-shaped limb pointing backwards on the ventral face, formed by the junction of the two fore-limbs. The segmentation of the body is very clear, especially on the abdomen. The whole body is perfectly smooth, without the least suspicion of hair.
Our Mazaro men could hardly understand what they said. Some of them waded in the river and caught a curious fish in holes in the claybank. Its ventral fin is peculiar, being unusually large, and of a circular shape, like boys' playthings called "suckers." We were told that this fish is found also in the Zambesi, and is called Chirire.
Atlee submits quite a remarkable case of congenital ventral gestation, the subject being a girl of six, who recovered after the discharge of the fetal mass from the abdomen. McIntyre speaks of a child of eleven, playing about and feeling well, but whose abdomen progressively increased in size 1 1/2 inches each day.
They sound the heap, probe the interstices with their antennae and tap the individual eggs with their palpi; then, this one here, that one there, they quickly apply the tip of their abdomen to the egg selected. Each time, we see a slender, horny prickle darting from the ventral surface, close to the end.
Man's ancestors are skull-less Vertebrates, like the Amphioxus. The body is a series of metamera, as several of the primitive segments are developed. The head contains in the ventral half the branchial gut, the trunk the hepatic gut. The medullary tube is still simple. No skull, jaws, or limbs. The number of metamera increases.
There were three different species of flies which sought shelter in my tent, which, unitedly, kept up a continual chorus of sounds one performed the basso profondo, another a tenor, and the third a weak contralto. The first emanated from a voracious and fierce fly, an inch long, having a ventral capacity for blood quite astonishing.
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