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alligator animal anterior appearance arch arises artery articulates becomes blood body bone border branches canal caudad cavity cells cleft close connection considerable consists continuous cord crocodile Crocodilia described diameter difference direction distance distinct divides dorsal ectoderm eggs embryo entire epithelium extends external fairly fibers Figure folds four gives glands groove head heart inner inserted internal intestine larger lateral layer length less lies lower marked mass median medullary membrane mesoblast middle muscle narrow nasal nearly nerve nest noted notochord opening origin outer outline pair passes Plate portion posterior preceding probably projecting region represented ribs seen short shown shows side skin skull smaller species spinal springs stage structure surface tail tendon thick thickened thin third tissue transverse upper usual vein ventral vertebrę vessels wall wide
Page 351 - A Selection from, the Catalogue of GP PUTNAM'S SONS Complete Catalogue...
Page 9 - Juan's. into the little lake, on their return down the river, and that the alligators were in such incredible numbers, and so close together from shore to shore, that it would have been easy to have walked across on their heads, had the animals been harmless?
Page 18 - One of the first things to be determined, of course, in the collection of embryological material is the time at which the eggs are laid. Judging from the statements of native hunters the laying season of the alligator might be thought to be at any time from January to September. As a matter of fact the month of June is the time when most, if not all, of the eggs are laid. SF Clarke gives June...
Page 8 - I say, that the river (in this place) from shore to shore, and perhaps near half a mile above and below me, appeared to be one solid bank of fish, of various kinds, pushing through this narrow pass of St.
Page 354 - BEDDARD. 8. Comparative Physiology of the Brain, etc. By JACQUES LOEB. 9. The Stars. By SIMON NEWCOMB. 10. The Basis of Social Relations. By DANIEL G. BRINTON. n. Experiments on Animals. By STEPHEN PAGBT. 12. Infection and Immunity.
Page 354 - MIVART. 3. Rivers of North America. By ISRAEL C. RUSSELL. 4. Earth Sculpture* or ; The Origin of Land Forms. By JAMES GEIKIE.
Page 18 - June 1 7th as the limits of the laying season in Florida, but I found at least one nest in which eggs were laid as late as June 26th : no eggs were found before the first date given by Clarke. It seemed quite certain that the laying, during the season in question, had been delayed by an extreme drought that had dried up the smaller swamps and reduced the alligator holes to mere puddles.
Page 225 - A ventral view of another embryo of the same age (fig. 2a), seen from the ventral side, shows that the blastopore extends quite through the blastoderm, in an oblique direction downwards and forwards, from the dorsal to the ventral side. The thickened area of the primitive streak is here very prominent. There is, too, the beginning of a curved depression at the -anterior end of the shield, the first formation of the head-fold.
Page 197 - ... veins which pass across the dorsal surface of the heart to enter the sinus venosus. The arterial blood is brought from the lungs by two wide, thinwalled pulmonary veins, Plate XIII, fig. 4, vpd, vps They leave the lungs somewhat caudad to their middle region, near the point, of entrance of the bronchii and the pulmonary arteries, pass mediad in a direction almost at right angles to the long axis of the body, and enter the left auricle at the same point. Blood leaves the heart through five large...
Page 29 - They also have a number of so-called " buttons'' or "corn marks" on the inside or under surface of an equal number of the scutes, resulting from embedded horn-like tissues in the center of those scales. These increase the difficulty in tanning the skins and detract somewhat from the appearance of the finished article, and for this reason the Florida skins are ordinarily the cheapest on the market. The farther south the skins are secured in Florida the greater the number of "corn marks," and those...