28 jfirst annual deport 



kidneys lie. The general shape of the abdominal cavity may be seen 

 from that of the viscera (Figure 3), which conforms to it in outline. 

 As may also be seen, the shape quite closely resembles that of Rhino- 

 bat us productus, in spite of the extreme difference in external form 

 of these two species. It is interesting to note that in the batfish, 

 having a breadth one and seven-tenths times its length, the abdom- 

 inal cavity is even narrower and longer than in the "shovel nose" 

 with a breadth of only one-third the length. Evidently the shape of 

 the abdominal cavity is not determined by the external form in these 

 species, but rather is coincident with the depressed body and similar 

 habits of the two. 



The alimentary canal, liver, spleen and pancreas will be seen to 

 closely resemble those of R. productus except that the liver is bilo- 

 bate and somewhat larger. In Figure 4 the spleen is shown attached 

 to the pyloric tract of the stomach, but in reality it lies between and 

 against the two divisions, as it does also in R. productus. The spiral 

 valve in this species has twenty-two turns (just double the number 

 of R. pr//(/iictux), each being quite narrow, as shown in the figure. 

 The pylori s is much farther in advance of the spiral valve than in 

 the latter species, also. 



The urogenital organs are best shown in the figure (Figure 4). 

 The testes in this specimen are united throughout the posterior half 

 of their length, attaching at the common end to the rectal gland. 

 Whether or not this is the normal condition of the species was not 

 determined, as only one specimen was dissected. Dorsal of the 

 middle of the testes extend the kidneys and Wolffian ducts, the 

 former mainly developed posteriorly, as shown, the latter extending 

 forward to the u'sophageal region, where they unite witli the vasa 

 efferent ia from the testes. Posteriorly the Wolffian ducts (vesicula? 

 seminalis) and the sperm sacs open into the cloaca by a single pore, 

 the urogenital sinus, which is well beyond the anal opening of the 

 alimentary canal. Other relationships may be seen from the figure. 



In the stomach of this specimen was found a considerable amount 

 of meat, but so chewed up as to prevent identification, except that 

 the remains of several polychaet worms were recognizable. No 

 chitinous or bony remains were found, and apparently this specimen 

 had eaten no crustacean or vertebrate food. 



Family CHIMAERIDAE 



Chimaera colliei Lay and Bennett. Chimaera, Ratfish. 

 One specimen brought in by fishermen at Newport; presumably 

 from deep water. 



