. Chimæroid fishes and their development. Fishes; Chimaeridae. 28 CHIMv^ROID FISHES AND THEIR DEVELOPMENT. (plate II, fit;. 5), if placed on a fiat surface, it spreads out circu- larly, measuring in this way over 5 cm. in diameter. It is pinkish (it is earlier 3'ellow, and later creamy white), although its tint is probably due to the capillaries in the enveloping membrane. These capillaries, it may be noted in passing, become focused around a well-marked stigma. In the disposition of yolk the egg differs slightly from that of tyiiical selachians {e\ ^., as shown by Riickert in Torpedo). {Cj. p
. Chimæroid fishes and their development. Fishes; Chimaeridae. 28 CHIMv^ROID FISHES AND THEIR DEVELOPMENT. (plate II, fit;. 5), if placed on a fiat surface, it spreads out circu- larly, measuring in this way over 5 cm. in diameter. It is pinkish (it is earlier 3'ellow, and later creamy white), although its tint is probably due to the capillaries in the enveloping membrane. These capillaries, it may be noted in passing, become focused around a well-marked stigma. In the disposition of yolk the egg differs slightly from that of tyiiical selachians {e\ ^., as shown by Riickert in Torpedo). {Cj. p. 47.) In the matter of fertilization, sperms have been found in the uppermost portion of the oviduct, and there can be little ques- tion that the earliest stages of fertilization here take place. It is further evident that the eggs are received in the oviducts one after another, for there is but a single funnel present, and it is prob- able, from the condition of the ovaries examined, that the eggs are shed from both right and left sides at almost the same time. B}' this inference we can also best explain the passage of the eggs, one to the right oviduct and one to the left, since if the first egg were blocking the upper portion of one oviduct, the second egg would natural!}' pass to the other. The fluidity of the egg at this stage unquestionably aids it in passing through the narrow opening of the oviduct in the zone of the capsular gland (plate 11, fig. 6), granting even that this opening is greatly enlarged at the time of the egg's descent. THE EGG-CAPSULE. The egg-capsules of Chim^eroids* are illustrated in figs. 13-23, and a list of those hitherto described, together with notes as to the depth at which they were collected, is given in Table C on page 29. An examination of the capsules indicates that they may be grouped according to the genera and species which they repre-. capsule of Chimaeroid?). From lithographic stone of Lerida (Spain). Ju- rassic. After Sauvage. *In
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfishes, bookyear1906
