The Emhryology of Chlamydoselachus 



543 



of the uterine portion of the right, and rarely the left oviduct, which is necessary to ac- 

 commodate the huge eggs and later the yolk sacs and the developing embryos in this 

 viviparous shark. 



In going through Dr. Dean's few scattered notes — literally with a magnifying glass 

 because they are at times written in a minute hand — I have been able to correlate certain 

 widely separated records and to find certain data either overlooked or not clearly evaluated 

 before. These have to do mainly with the reproductive organs of the female and with the 

 question as to whether those of both sides are functional or whether those of only one 

 side are used in reproduction. These data are so interesting and so valuable that they 

 deserve careful study. However, we will first take up the literature dealing with each 

 set of organs — ovaries and oviducts — and then consider Dean's notes which will throw 

 much hght on both structure and function. 



Text-figure 8 

 Ovaries and oviducts of Chlamydoselachus, drawn one-half natural size. 

 n. g., nidamental glands. 



Printed from the original woodcut after the drawing by Paulus Roetter for Garman, 1885, Fig. 1, pi. XIX. 



The ovaries and the anterior portions of the oviducts of Chlamydoselachus were 

 first figured by Garman (1885). Because of its historic interest, his drawing is reproduced 

 from the original woodcut (Text-figure 8 herein). Garman merely says of these organs 

 ''A section some 12 inches in length of the ovaries and oviducts is represented in the 

 sketch". It is a long jump from Garman's figure (1885) to Deinega's representation (1925) 

 of the genital organs of our fish. His small figure printed on poor paper is not easy to 

 understand. However, Smith's admirable drawings, made from his dissections of four 

 specimens from Japan in the Museum collection, give a clear picture of the form and the 

 relative sizes of the female reproductive organs in various stages of development. They 

 will be referred to later for positions and structures of both ovaries and oviducts. 



And last of all Momose (1938) has figured the abdominal viscera of a 1510-mm. 

 female Chlamydoselachus with the huge ovaries removed. This figure is reproduced in 

 his article in small size on soft paper and is not suitable for reproduction. However, 

 Momose has been good enough to send me the original drawing with the huge ovaries 



