60 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY II. 



g. Teeth hooked, without grinding surface, 4-4 in the principal row ; lips normal ; 

 no barbel; intestines short; dorsal over ventrals ; mouth 

 Bmall Ericymba, 43. 



•**. Dentary bones straight and flat, united throughout their length ; mandible much 

 contracted, incurved, tongue-like, a lobe on each side of it at 

 base ; air-bladder normal ; bones of head not cavernous ; fins 

 without spines {Exoglossince) : 

 h. Teeth hooked, without grinding surface, 4-4 in the principal row ; dorsal 

 slightly behind beginning of ventrals; uo barbel; premaxil- 

 laries not projectile Exoglossum, 44. 



****. Dorsal fin with a strong spine composed of two, the posterior received into a 

 longitudinal groove of the anterior ; inner border of the ven- 

 tral fins adherent to the body {Plagopterince) : 

 i. Body with small scales ; teeth hooked, without grinding surface, the principal 

 row 4-4 ; no barbels ; dorsal behind ventrals. Lepidomeda, 45. 



ii. Body entirely naked ; teeth hooked, without grinding surface, the principal 

 row 4-4; no barbels; dorsal behind ventrals Meda, 46. 



m. Body entirely naked ; teeth hooked, without grinding surface, the principal 

 row 5-4 ; a barbel at the extremity of the maxillary ; dorsal 



behind ventrals Plagopterus, 47. 



»****. Pharyngeal teeth quite rudimental, replaced by a somewhat uneven ridge of the 

 bone (^Graodontince) : • 



/. Dorsal flu short, without spinous ray, opposite ventrals ; anal fin short ; mouth 

 small, without barbel, the upper jaw somewhat longer; 

 alimentary canal short ; scales of moderate size ; lateral line 

 complete Graodus, 48. 



41. LUXILUS SELENE, sp. nov. 



A handsome and striking species allied to L. cornutus, but showing a 

 tendency toward Syhopsis. Head short and stout, rounded above, 4^ 

 in length, depth about the same; body much more elongate than in cor- 

 nutus, and the head proportionally shorter; mouth oblique, terminal, 

 lower jaw included ; eye very large, 3 in head, wider than snout and 

 than interorbital space ; snout blunt, quite short. 



Fin-rays : — Dorsal I, 8. Anal I, 7. Dorsal fin about midway of body, 

 over ventrals ; dorsal very high ; pectorals reaching two-thirds of the 

 distance to ventrals, the latter to vent. Scales large, the exposed sur- 

 faces much less narrowed than in cornutus, 4-40-3, the lateral line little 

 decurved. 



Color bright steel-blue above, with a very distinct silvery band, which 

 overlies a plumbeous shade ; cheeks and belly silvery, a small, round, 

 black caudal spot, a dark vertebral line ; iris white ; fins unmarked. 



Teeth with marked masticatory surface, 2, 4-4, 2. 



Length of specimen 4 inches. 



