156 Exoglossum. 



Exoglossum, meaning outside tongue. It will belong to the 

 same natural order and family of the genera Cyprinus, Catos- 

 iomus, &c. 



Exoglossum. Generic Definition. — 'Body oblong, thick, and 

 scaly ; head without scales, mouth without lips or teeth-, 

 upper jaw longer, entire ; the lower trilobed, middle lobe 

 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, the tail forked, &c. 



1. Species. Exoglossum vittatum, Raf. Cyprinus maxil' 

 lingua, Lesueur. Specific Definition.'-— B^ck browniab olive ; 

 sides blue, with a brownish band ; a black spot at the base of 

 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. 86. cum. 

 ic. I have been obliged to change the specific name of maxil- 

 lingua, since it has the same meaning as the generic name. 



2. Species. Exoglossum annulatum, Raf. Head black 

 above, cheeks and gills olivaceous, back blackish olive, sides 

 olivaceous, lower parts olive gray ; a black ring at the base of 

 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 name, 

 Black chub. Head broad and flat above, iris large and gray; 

 fins olivaceous, abdominal distant and with nine rays, pectoral 

 with fifteen, caudal, with twenty -four. 



