The Emhryology of Chlamydoselachus 



545 



eggs of various si2,es and of various degrees of ''ripeness" such as I have found in the 

 ovaries in scores of dissected sharks and rays. Furthermore, although, as I have found, all 

 the eggs in the uterus of a viviparous shark or ray may vary somewhat in si2;e, the limits 

 are fairly close. They do not vary from "the size of the yolk of a small hen's egg" to that 

 "of large and small peas". Then too when a wind egg is found, it, though smaller in size. 



Urogenital system of the female Chlamydosel- 

 achus, ventral views, one-fifth natural sizie. 



Text-figure 10. Urogenital organs of a specimen 



1398 mm. long. The excretory ducts are 



concealed by the oviducts. 



ah.p., abdominal pore; m, mesonephros; ovd., oviduct; ovy., 

 ovary; r.cl., rectal portion of the cloaca; ug.s., opening from 

 the urogenital sinus; v.l, ventral ligament of the oviduct. 

 Drawn from specimen No. IV in the American Museum 

 of Natural History. 

 After Smith, 1937, p. 432. 



Text-figure 11. Urogenital organs of a specimen 

 1550 mm. long. The shell glands and the 

 adjacent portions of the oviducts are displaced 

 laterally, and the excretory ducts are not shown. 

 ab.p., abdominal pore; m., mesonephros; ovd., oviduct; 

 OFy., ovary; r.cl., rectal portion of the cloaca; s.g., shell 

 gland; ur.p., urethral pore; ut., uterus; f.I., ventral ligament 



of the oviduct. 



Drawn from specimen No. Ill in the American Museum 



of Natural History. 



After Smith, 1937, p. 432. 





Text-figure 10. 



Text-figure 11. 



is plainly recognisable as being a shell without embryo and yolk. To settle the matter 

 effectively, attention is called to the fact that Collett does not speak of egg shells. He 

 wrote uterus but he surely meant ovary. 



It seems that this misidentification of the genital organs may be due to the possibility 

 that Collett wrote in Norwegian and that his thesis was translated into English by another 

 hand and that it was published without his seeing the proofs. 



Hawkes (1907) had several specimens, but, of the organs under consideration, she 

 briefly states that "The ovaries are diffuse bodies attached by broad mesenteries to the 



