LAKE CARP. 811 



Diagnosis. — This species may usually be readily known from the closely 

 related 0. velifer by the lower dorsal, and from C. thompsoni by the slen- 

 derer body and larger scales. 



Hahiis. — This is the common Carp Sucker of Eastern Pennsylvania and 

 of the Southern and Southwestern States. It has not yet been noticed in 

 Ohio, but it doubtless occurs here. 



32. Carpiodbs THOMPSON! Agassiz. 



L.nke Carp. 



Catostomus cyprinus, Thompson, Hist. Vt., 1842, 133. , 



Carpiodes thompsoni, Agassiz, Am. Jonrn. Soi. Arts, 2d series, xix, 1865, 191. — COPB, Proe. 

 Acad. Nat. Soi. PhiU., 1864, 285 ; Proc. Am. Philos. Soo. Phlla., 1870, 483.— Joedas, 

 Man. Vert., 1876, 297; 2d Ed , 1878, 321; Ball. U. S. Nat. Mus., xii, 1878, 198.— Job- 

 dan and CoPKLAND, Check List, 1876, 158. — Jokdan and Gilbert, in Klippart's 

 Eept., 1876, 53. 

 lohthyobm thompsoni, Nblson, Ball. No. 1, 111. Mas. Nat. Hist., 1876, 49. 



Deacription — Body short and stoat, the back maoh arched, head moderate, the muzzle 

 somewhat pointed ; eye small, C^ in head ; tip of lower jaw much in advance of the nos- 

 trils ; nXaxillary reaching line of orbit ; anterior snborbital large, deep, roundish ; dor- 

 sal fin with its anterior rays not thickened, elevated, their length about two thirds that 

 of the base of the fin ; origin of dorsal about midway between snout and base of caudal ; 

 color pale; head 4 to 4J; depth 2^ ; D., 27 ; scales 8-39 to 41-6. Length one foot. 



Habitat, Great Lakes, abundant. 



Diagnosis. — This species may usually be known by the short body in 

 connection with the comparatively low dorsal fin. 



Habits. — This fish is as yet recorded only from the great lakes. It is 

 abundant in Lake Erie, and is sold by the fishermen as Carp, or some- 

 times, especially after being split and salted, as Lake Shad. I have ex- 

 amined many specimens from Sandusky Bay. 



33. Caepiodes bison Agassiz. 



L.ong:-lieaded €arp Sucker. 



Carpiodes bison, Agassiz, Am, Journ. Sci. Arts, 1854, 355 ; 1855, 190. — Cope, Proc. Am. 

 Philos. Soc. Phila., 1870, 4f-3.— Jordan, Man. Vert., 1876, 297; 2d Ed., 1878, 322; 

 Bull. U. S. Nat. Mus., ix, 1877, 50 ; xii, 1878, 197. — Jordan and Copeland, Check 

 List, 1876, 158.— JoKDAN and Gilbert, in Klippart's Kept., 1876, 53. 



Ichthyolus Mson, Nklson, Ball. No. 1, Ills. Mas. Nat. Hist., 1876, 49. 



Description. — Body oblong, the back not much arched ; head quite long ; muzzle elon- 

 gate-conic, 80 that the eye is nearly median in position, the middle of the length of the 

 head falling in front of its posterior margin ; eye large, 4^ in head ; lips -well developed ; 

 anterior rays of the dorsal fin not thickened, i^ot much shorter than the base of the fin; 

 color pale ; head 3^ ; depth 3 ; D., 27 ; scales 7-40-5, Length, one foot. 



Habitat, Ohio Valley, not very common. 



