CYPBTNID^E. CVHI. 299 



head flattish above; mouth little oblique; greenish, sides 

 leaden silvery; D. I, 8; A. I, 8; lat. 1. 38. Ohio Valley. 



3. C. leucioda, (Cope) Jor. Head 4 in length; eye 

 moderate, 3^ in head; olive, scales above dark-edged; 

 sides silvery with a purple band; muzzle and base of 

 dorsal red in males; a black spot at base of caudal fin; 

 D. I, 8; A. I, 8; lat. 1. 39. Tennessee River. 



//. ER ICY MB A, Cope. EBICYMBAS. 

 1. . buccata, Cope. SILVER - MOUTHED DACE. 

 Elongate; depth nearly 5 in length; head 4; eye large, 

 3 in head; olivaceous above, sides brilliantly silvery, a 

 narrow vertebral line, and a lateral chain of brown dots; 

 upper jaw rather large, its profile angulated; mucous 

 channels in lower jaw very conspicuous; D. I, 8; A. I, 8; 

 lat. 1. 33; L. 5. Ohio Valley, Penn. to Kentucky, 

 and Illinois, abundant. A beautiful little fish singularly 

 distinguished from all our other species by the cavernous 

 bones of the head. 



12. PHENACOBIUS, Cope. PHENACOBIES. 

 (=Sarcidium^ Cope.) 



1. P. uranops, Cope. Head 4f in length; body very 

 long and slender, nearly cylindric; isthmus very wide; 

 chest naked; eyes large, high up, 3 in head; depth 6; 

 lips very thick, tuberculate; pale, a darker lateral streak; 

 D. I, 8; A. I, 7; lat. 1. 60. Tennessee R. 



2. P. teretu/us, Cope. Head=depth, 4f in length; 

 form stouter than in the preceding; chest scaled; lips 

 plicate; a dusky lateral band; D. I, 8; A. I, 7; lat. 1. 43. 

 Streams of W. Va. 



3. P. scopiferus, (Cope) Jor. Form comparatively 

 stout; depth 4 in length; head not large, 4f in length; 



