NATURAL SCIENCES OF PHILADELPHIA. 285 



tu m, Gir., with the muzzle elongated and not elevated as in the c al lip- 

 teryx, and the lips little developed. Scales little less exposed anteriorly 

 than posteriorly, 53. Head short, one-fifth of length to notch of tail. Eye 

 four and a half times in length of head. Operculum little higher than long, 

 little concave above. Fins small ; D. 1. 8. C. 19. A. narrow, 1. 7. V. 8, 

 reaching three-fifths distance to vent. P. rounded, 16, reaching three-fifths 

 distance to vent. Back arched to dorsal. Tail broad ; seven rows of scales on 

 middle of peduncle. 



One specimen is three inches long. 



Color of head and body above dark-brown ; below yellowish. Fins without 

 markings. 



Looality. Bruce, Macomb Co., and Grosse Isle. 



Hylomyzon nigricans, Agassiz. 

 Grosse Isle. 



Ptychostomus aureolus, Agassiz. No. 231. 

 Saginaw Bay and Grosse Isle. 



Carpiodes thompsoni, Agassiz. Am. Journ. Sci. and Arts, xix. p. 76. 

 and Thomps. Hist. Vermont, p. 133. Nos. 228 and 230. Saginaw Bay, 

 I find one and two more rows of scales than described by Thompson, and 

 the outlines of the latter not quite as regularly continuous as one might infer 

 from Agassiz's remarks. C. d a in a 1 i s, brought by Hammond from the 

 upper Platte, has larger scales and is more elongate, and there are but 25 

 rays in the dorsal fin. 



Description of Six new species of Western Asiatic UNTONIDiE. 



BY ISAAC LEA. 



Unio Homsensis Testa laevi, suboblonga, inaequilaterali, ad latere planu- 

 lata, postice angulata, ; valvulis crassis, antice crassioribus ; natibus prominulis, 

 ad apices plicatis ; epidermide tenebroso-fusca; dentibus cardinalibus crassis 

 crennlatisque ; margarita purpurescente et iridescente. 



Hab. Lake Horns, (ancient Emesa), Pive'r Orontes, North Syria. C. M. 

 Wheatley. 



Unio Kullethensis. Testa laevi, oblonga, inaequilaterali, at latere plann- 

 lata., antice subtruncata, postice obtuse angulata; valvulis crassis, antice cras- 

 sioribus ; natibus prominulis ; epidermide luteola, postice radiata et tenebroso- 

 viridi ; dentibus cardinalibus parvis, acuminatis crenulatisque ; margarita vel 

 alba vel aurefi et valde iridescente. 



Hab. Near Mardin, in a stream from Kulleth falling into the Tigris, Asia. 

 C. M. Wheatley. 



Unio Orphaensis. Testa la?vi, oblongii, inaequilaterali, antice rotundata, 

 postice obtuse subbiangulata ; valvulis crassiusculis, antice crassioribus ; na- 

 tibus subprominentibus, ad apices crebre et minute undulatis; epidermide 

 olivacea, virido-radiata ; dentibus cardinalibus parvis, compressis, crenulatie, 



vent. P. 14, extending halfway to ventrals. Posterior angle of operculum right; anterior horder 

 shorter than postero-inferior. Length 4 inches. 



Body above reddish ; head paler ; sides and below silvery ; a dark spot on base of middle of tail 

 and on middle of dorsal and anal. 



Platte Ri.er, at Ft. Kearney, Kansas. Dr. W. A. Hammond. 



This species resem bles the C. mormyrus more than any other. InC. nasutum the head 

 is much longer and the scales larger. 



1864.] 



