PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 207 



Eye large, 4.J in interoibital width, wliicli is slightly more thau half 

 length of head. Front of dorsal about equidistant between tip of snout 

 and front of adipose fin, the spine less than half length of head by 

 diameter of pupil. Pectoral spine slightly more thau half length of 

 head. Base of aiial ^ length of body. Ihis specimen (10 inches long) 

 seems to difller irom those previously described in its shorter spines. 



The significance of the marmorations of this form is not ytt certainly 

 known, and no other characters have been pointed out separating it from 

 nebulosvs, which is itself often obscurely mottled. Until more light 

 is thrown upon the question, we may distinguish the sharply marmor- 

 ated form as a subspecies. The marmoratus has been recorded by Pro- 

 fessor Forbes from Southern Illinois, but has not before been reported 

 from Indiana. 



4. Ictiobus bubalus Eaf. 



Several specimens of this species were seen, none of them adult. An 

 -example, one foot long, shows the following characters: 



Dusky brownish above and on sides, light below. Fins blackish. 



Head 3^ in length ; depth 2f . D. I, 25 ; A. II, 9. Lat. 1. 3Sf . 



Back strongly carinate from occiput to front of dorsal, the anterior 

 profile well arched, much more so than ventral outline. 



Upper lip very thin, finely and evenl}^ plicate ; lower lip thicker, also 

 plicate, the folds much broken into papilla?. Mandible very obliquely 

 set, its length about equaling snout, 3^ in head. Opercle wide, 2^ in 

 head, with strong stria? radiating from its upper anterior angle. Eye 

 small, 6 in head, its center at the end of first ^ of head. Interorbital 

 width If in head. 



Front of dorsal about midway of body, falling slightly in advance 

 of base of ventrals ; anterior rays elevated, about ^ length of base of 

 fin. If in head. Last dorsal ray over middle of anal, the first rays of 

 which reach base of caudal. Pectorals not reaching ventrals, If in 

 head ; ventrals equaling pectorals, not nearly reaching vent. 



5. Erimyzon sucetta Lac. 

 i^ot very abundant. 



6. Notropis heterodon Cope. 



The specimens on which the following description is based are re- 

 ferred with doubt to the Hemitrenila heterodon of Cope. The characters 

 shown by them are very different from those assigned to heterodon, inas- 

 nuich as the lateral line is complete, the teeth 2-4-4-2, and the snout 

 sharp, with a terminal mouth. A large amount of material in the Illi- 

 nois Laboratory of Natural History, taken from the streams of Illinois, 

 shows such a complete gradation between the two forms, however, that 

 I do not venture at present to assign specific rank to that represented 

 by my specimens. 



Body slender, compressed, the back little elevated, rising from snout 

 to front of dorsal. Head small; snout short and rather sharp, slightly 



