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 
S000 Se Oe Ane Seam Acacias mb coceUGOS 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 ( Exoglossina) : 
h. Teeth hooked, without grinding surface, 4-4 in the principal row; dorsal 
slightly behind beginning of ventrals; no barbel; premaxil- 
laries! noiy projectile soo. sae cease =~ 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 (Plagoptering) : 
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.-.---.- MepaA, 46. 
iii. Body entirely naked; teeth hooked, without grinding surface, the principal 
row 5-4; a barbel at the extremity of the maxillary; dorsal 
behindsv.entralls ssc. pec oe ey ete ee ee PLAGOPTERUS, 47. 
*4*<* Pharyngeal teeth quite rudimental, replaced by a somewhat uneven ridge of the 
bone (Graodontine) : 
j. Dorsal fin 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 
COLIN) OS Termes Gkeree ese candids ease booteuescees GRAODUS, 48. 
41. LUXILUS SELENE, sp. nov. 
A handsome and striking species allied to Z. cornutus, but showing a 
tendency toward Hybopsis. Head short and stout, rounded above, 44 
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:—DorsalI, 8. AnallI, 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 masticatury surface, 2, 4—4, 2. 
Length of specimen 4 inches. 
