1906.] 



ANATOMY OF CENTROPHOTIUS CALCEUS, 



873 



povtion of the stomach, so tliat the condition found in Centropl torus 

 calceus seems to be unique. Owing to this fact that tlie bile- 

 duct opens into the large intestine and not into the elongated 

 portion of the duodenum, there is obviously no " Zwischendarm " 

 or small intestine * present in Gentro2)horus ccdceits as in the other 

 three Squalidas referred to. As regards the position of the 

 pyloric thickening in the gut of C. calceus, I regret not being 

 able to speak with certainty. Usually it occurs at the commence- 

 ment of the duodenum, i. e., anterior to the opening of the bile- 

 duct, and there certainly is a thickening in tliat position in 

 C. calceus, but it is not very distinct. There are no pyloric ca?ca 

 present in G. calceus such as occur in Lcemargas. 



Text-fiff. 135. 



Text-fig. 136. 



Centrophorus calceus. 

 Text-fig. 135.— Transverse section across bile-duct (0-P of PI. LVII. fig. 3). 



Letters as before. 



Text-fig. 136.— Transverse section across bile-duct (Q-R of PI. LVII. fig. 3). 



Letters as before. The bile-duct has here divided into two. 



The internal surface of the cardiac portion of the stomach is 

 quite smooth and devoid of glands; on the other hand, the 

 internal surface of the pyloric portion is folded into longitudinal 

 ridges and highly glandular (text-figs. 128, 129). Transverse 

 sections across the duodenum about half an inch fi"om its com- 

 mencement (text-figs. 130, 131), and about an inch from its 



* I am indebted to Dr. G. J. Jenkins for some information in this connection. 



58* 



