156 Exoglossum. 
Exoglossum, meaning outside tongue. It will belong to the 
same natural order and family of the genera Cyprinus, Catoslo- 
mus, &c. 
Exociossum. Generic Definition—Body oblong, thick, and 
scaly ; head without. scales, mouth without lips or teeth, 
upper jaw longer, entire; the lower trilobed, middle lob 
longer, performing the office of tongue ; dorsal fin opposite to 
the abdominal fins ; three rays to the branchial membrane. 
Remarks. Besides the above characters, the two species 
known at present have, in common, the lateral line ascending 
upwards at the base, tail forked, &c. 
1. Species. Exroglossum vittatum, Raf. Cyprinus mazil- 
lingua, Lesueur. Specific Definition —Back brownish olive; 
sides blue, with a brownish band; a black spot at the base ol 
the caudal fin, lower parts silvery gray ; lateral line ascending 
upwards at the base ; dorsal and anal fins with nine rays} tail 
forked. 
Remarks. Length four inches; vulgar name little sucker. 
For further particulars, see Lesueur’s description, p- 85.cll™ 
ic. I have been obliged to change the specific name of mazil: 
lingua, since it has the same meaning as the generic name. 
“2, Species. Ezoglossum annulatum, Raf. Head black 
above, cheeks and gills olivaceous, back blackish olive, sides 
olivaceous, lower parts olive gray; a black ring at the base 
the tail ; lateral line ascending upwards at the base, tail forked, 
dorsal and anal fins with nine rays. 
Remarks. Length from three to six inches ; vulgar nate, 
Black chub. Head broad and flat above, iris large and gr ; 
fins olivaceous, abdominal distant and with nine rays, pector® 
with fifteen, caudal with twenty-four. | 
