278 PROCEEDINGS OF THE ACADEMY OF 



of caudal.) Anterior base of dorsal measures one-half the distan3e from 

 end of muzzle to base of tail. Lateral line nearly straight. Operculum 

 rounded posteriorly, scarcely concave above. Eye contained 5J times in 

 length of head. Scales J41 ; radii fewer and weaker than inbiguttatus. 

 Dermal head tubercles longest on vertex, smallest on muzzle, in four alternat- 

 ing rows, one on each side becoming superciliary. Fins, D. 1*9 ; P. 15 ; V. 

 1-8, just reaching vent ; A. 1-8 ; C. 19. The dorsal and anal are much pro- 

 longed posteriorly, the greatest horizontal length of the former nearly equalling 

 the length of the upper surface of the head. Six and eight inches are the 

 longest dimensions before us. Color of upper surfaces olive brown ; below, 

 from above lateral line, yellowish ; preopercular region rosy ; pectorals slightly 

 dusky, otherwise no fin markings. 



This fish is shorter, stouter and blunter than the biguttatus, and has 

 larger dorsal and anal fins, there being one more ray in the latter. The oper- 

 culum is not so angulated or concave above. 



In some of the specimens of this species, especially among the half-grown, 

 I find a tooth of the second row of pharyngeals, found in Semotilus proper. 

 Nevertheless the barbel is on the end of the maxillary, as in the type of Cera- 

 tichthys, and not above it, as in Semotilus. Specimens from Grosse Isle, from 

 Waterford, Oakland Co., from Clinton River and from Bruce, Macomb Co., 

 Michigan. 



Ceratichthys stigmaticus, sp. nov. 



Dorsal outline rising gradually from end of muzzle to base of dorsal fin. 

 Muzzle projecting a little beyond premaxillary outline. Head (equal greatest 

 depth) 4 limes in total length ; eye 3^ times in length of head, its superior 

 rim upon the frontal plane. Scales ?40. Radii about 15 exposed, stronger 

 than the concentric lines. Fins short, ventrals a little anterior to dorsal, not 

 reaching the vent. D. 1-8; C. 20; A. 1-7 ; V. 8. From basaof caudal to 

 anterior base of dorsal, equal from latter to posterior nares. General color 

 reddish, operculum and cheeks more silvery. A brown band from muzzle to 

 eye, and a very distinct spot at base of tail. Total length, two and a half 

 inches. Pharyngeal bones stout, the superior limb broad ; teeth 1*4 4 : 1. 

 Barbel on the end of the o. maxillare. 



Rhinichthys 1 u n a t u s, sp. nov. 



Stout, the head broad, and contained four times in length to base of tail. 

 Greatest height 4 times in the same. Dorsal fin a little behind opposite 

 ventrals ; latter reaching anal. Caudal lunate, or with a broad shallow 

 emargination. Eye a little less than one-fourth the length of the head. About 

 twenty longitudinal rows between dorsal and ventral fins, and sixty traversed 

 by the lateral line. From end of muzzle to base of first dorsal ray equal from 

 latter point to concavity of caudal. Muzzle projecting just beyond mandible. 

 Rays, D. 1-8; C. 19 ; A. 17 ; V. 18 ; P. 15. The largest specimens are 2 

 inches long. 



Above reddish brown, with irregular, rusty spots, which in small specimens 

 trace a lateral shade, and extend on the abdomen ; usually the latter is un- 

 spotted silvery. 



Specimens from Grosse Isle, obtained by Prof. Fox. This fish is stouter than 

 the a t r o n a s u s, has a smaller eye and a less deeply forked tail, besides the 

 difference in color. Marmora tus has a longer nose, (one more anal ray) 

 and a caudal spot. From obtusus, meleagris and nasutus* it can 

 also be readily distinguished. 



* Another species, brought by Dr. Hammond from Kansas, has not been described. Rhinichthys 

 maxilloBus is peculiar in its heavy muzzle, and broad mouth, aud gular region, and tor an 

 elongate form and backward position of fins. Eye with considerable vertical range, entering 5 S 

 times into length of head, latter four times to base of tail. Greatest height five and a half times 

 From base of caudal to base of lront ray of dorsal equal from latter point to opposite middle or 

 orbit. Fins all small, especially the ventrals, which reach the vent. Dorsal originating a little 



[Dec- 



