CYPRTNID^E. CVIII. 273 



nn. Small weak species, with the head short, 

 mouth small, and the lower jaw usually 

 not projecting; scales scarcely silvery; 

 inner row of teeth 4-4, with masticatory 

 surface. . . . HYBOPSIS, 11. 



II. Lateral line with more than 45 scales ; head broad 

 and large; body little compressed; teeth with- 

 out masticatory surface, 2, 5-4, 2. 



SEMOTILUS, 7. 



. Mouth inferior, scarcely oblique, the upper jaw being 

 notably longest. 



1. Intestinal canal about eight times the length of the 



body, its numerous convolutions entirely surround- 

 ing the small air-bladder; peritoneum black ; head 

 rather long and narrow, with sub- vertical cheeks; 

 lips with cartilaginous sheaths ; eyes well back and 

 high up the head, the iris orange-colored; scales 

 rather small, more or less mottled; a blackish verti- 

 cal bar behind head and a dusky band across dorsal 

 and anal, which in spring males is bordered with 

 fiery orange; back and head coarsely tuberculated 

 in $ in spring; teeth 4-4, with oblique masticatory 

 surface CAMPOSTOMA, 2. 



2. Sub-orbital bone, interopercle and base of mandible 



much dilated, cavernous, crossed by large mucous 

 channels (these readily seen under any circum- 

 stances, by looking at the head of the fish from 

 beloio); snout thick; slender fishes, brightly silvery; 

 teeth 1, 4-4, 0, hooked, without masticatory surface. 



ERICYMBA, 6. 



3. Mandible much contracted, with a lobe on each side at 



base; the middle portion appearing like a protrud- 

 ing tongue; intermaxillaries not projectile; stout 

 species, dusky in color; teeth 1,4-4, 1, hooked, with- 

 out masticatory surface. . . EXOGLOSSUM, 1. 



4. Lips large, defended by a cartilaginous sheath on their 



opposing edges, somewhat plicate or tuberculate; 

 18 



