382 



KEPOKT OF THE COMMISSIONEK OF FISHERIES. 



slightly. Of 22 females examined, 3 had 3 p3doric coeca each and the 

 remainder but 2. Of 22 males dt had 3 cceca and the remainder 2. In 

 all the specimens of each species when but 2 pyloric coeca occur they 

 are located 1 on either side of the coecum. The 2 appendages are 

 never opposite. In all cases the right caecum is located about its width 

 in front of the left. When 3 appendages are present the third is 



Cut 5. — Alimentary canal of Typhlich- 

 thys subterraneus, side view, showing 

 gall-sac. 



Cut 6. 



Amblyopsis spclssus, showing 

 three pyloric coeca. 



always just back of the normal one, the 2 normal appendages retaining 

 their usual positions. Cut 7 shows the normal position of the pyloric 

 coeca (P) in Aniblyopsis. Cut 6 shows the 3 coeca in another speci- 

 men. But 1 specimen of Trogllchthys rosse Eigenmann was examined 

 and this had 2 pyloric coeca (cut 9). 



The general characters of the Aml)lyo2>sid86 may be summed up as 

 follows: Body varying considerably in shape in the different genera, 



Cot 7.— Alimentary canal of Arnblyoj^sia sjjelxus. A, air bladder; O, gall-sac; P, pyloric coeca; 



iS, spleen. 



but in all rather heavy anteriorly and the posterior portion com- 

 pressed; head more or less depressed, its upper surface quite Hat in 

 AmMyopsis; mouth large, the lower jaw gen(5rally projecting beyond 

 the upper; premaxillary not strictly protractile, although not firmly 

 joined to the ethmoid, and forming the entire margin of the upper 

 jaw; bands of villiform teeth on the dentary, premaxillary, and pala- 

 tine bones; braochiostegal rays 6; gillrakers very short; gill mem- 



