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INDIANA UNIAH^KSITY STUDIES 



about reaching- middle of ventral, tlie supine with its filament equal to the 

 length of the head; origin of ventrals nearer the tip of the snout tlian 

 the dorsal, reaching half way to anal; anus three-fourths the distance, 

 from origin of ventrals to anal : anal reaching little mure than half way 

 to caudal in the type, somewhat further in some of the paratypes; dorsal 

 spine equals head less prenasal region, scarcely projecting beyond the rest 

 of the rays ; adipose scarcely evident, a distinct spine. Tips of the teeth 

 of the outer rows of both premaxillary and mandible in the largest very 

 broad, incisor-like, the middle ones of both jaws tending to become bilobed, 

 the bilobed teeth in smaller specimens more numerous ; distance between 

 snout and dorsal 2.5 in the length ; distance of last dorsal ray from caudal 

 5.66-0.5 in the length. 



Nearly black, or marbled, or with a band behind the adipose, caudal 

 with a dark median band. 



Type, 75 nun. Boquia CM. No. 4863. 



Paratypes, five specimens Boquia. CM. No. 4864 a-b, I.U.M. No. 

 12708 a-c. 



This species diifers from liomodon in its feeble adipose spine, length of 

 barbels, clniracttr of teeth and color. 



11. Cyclopium trifasciatum sp. nov. 



Distinguished from the other species of the geiuis by its low dorsal, 

 short barbel, anterior and short ventrals, etc. 



Head about 3.5 ; depth 6 ; D. 7 ; A. 7 ; interocular 4-5 ; distance be- 

 tween eye and posterior nares 3 in the head ; nasal flap forming a nearly 

 equilateral triangle in the adult, comparatively broader at the base in the 

 young ; barbel reaching to about opposite the end of the lips ; pectorals 

 very broad, with 12 rays, rounded, the outer ray slightly produced, about 

 equal to length of head less prenasal space, the filament about reaching 

 middle of the ventrals; the pectoral rays extending considerably beyond 

 origin of ventrals; origin of ventrals considerably in front of the vertical 

 from the front of the dorsal ; outer ventral ray thickened but not pro- 

 longed beyond the line of the general margin of the fin, reaching about 

 two-thirds to the anus; anal in the female rounded, in the male with a 

 deep notch behind the second ray, the fifth and sixth rays prolonged and 

 thickened, reaching base of caudal ; caudal obliquely eniarginate, the 

 outer rays but slightly produced ; adipose a short ridge, 5 in the length, 

 terminating in a movable. spine attached to the back by a thin membrane; 

 dorsal low. the first ray scarcely produced, not reaching the tip of some 

 of the posterior rays when depressed, 1.7-2 in the head ; outer teeth of the 

 premaxillary narrow spatulate, pointed in the young, those of the lower 

 jaw bicuspid. 



Very young yellow with a black band across the head, another across 

 the back at the base of the dorsal, another across the anterior part of the 

 adipose and the back just in front of it and another across the end of the 

 caudal peduncle. The yellow interspaces reduced to light bands and grad- 

 ually disappearing with age. A few of the smaller specimens without 

 traces of bands. The light space between the last dark bands remains 

 longest and is more conspicuous but this also becomes obscured and some- 



