472 



MRS. O. A. MERRITT HAWKES ON THE 



[May 28, 



The mouth is succeeded by the pharynx into which open the 

 six pairs of branchial clefts, the first of which is 1 cm. longer than 



Text-fig. 138. 



S.V. 



Alimentary canal from the middle of the stomach to the middle of the 

 colon of CMamydoselachus. 



Heference Xietters. 

 B.D. Bile-duct. 

 B.D.B.E. Dotted lines showing the position of the apparently enlarged end of the 

 bile-duct in the walls of the bursa entiana. 

 B.E. Bursa entiana. 



C. Caecum at the hinder end of the larger arm of the stomach. 

 L.T.S. Thickening of the stomach wall, probably due to a lymphatic gland. 

 Py.V. Pyloric valve. 

 S. Stomach. 



S'. Short arm of the stomach. 

 S.V. Spiral valve. 



