62. LKucosoMus. 2G9 



nearly flat, equals the length of the snout. Snout somewhat 

 compressed, subconical. Mouth subhorizontal, rather wide the 

 maxillary extending to below the front margin of the orbit ; upper 

 jaw rather longer than the lower. Praeorbital very large, the other 

 suborbital bones narrow. The origin of the dorsal tin is nearly 

 opposite to that of the ventrals, and midway between the end of the 

 snout and the root of the caudal. Caudal tin forked. The pectoral 

 hns terminate at a great distance from the ventrals. There are four 

 longitudinal series of scales between the lateral line and central fin 

 bilvcry, membrane at the base of each scale blackish. Youn"- with 

 an mconsincuous dark lateral band. 



Pharyngeal teeth 4 . 2—2 . 5 or 4, but slightly compressed, termi- 

 nating in a hook. Gili-rakers very short, and t•e^v in number. The 

 attachmeut of the gill-membranes to the isthmus takes place oppo- 

 site to the angle of the praioperculum. 



United States ; Canada. 



a-b. Adult(lS inches long). Montreal. Purchased of Mr Wrio-ht 



e-d. Eine adult specimens. Canada. Purchased of Mr. Wrio-ht • 



e-h. Young. Canada. Purchased of Mr. Wright ^ 



I. Adult: stuffed. Canada. 



1--1. Young. Parmachenee Lake, Maine. Purchased of Mr. Wrio-ht 



m. Adidt. Bangely Lake, Maine. Purchased of Mr. Wrio-ht "^ 



n. Adult Delaware lliver. Purchased of 0. Sal™, Esq. (&»w^,7„.s' 



rliotlieus. Cope). 

 0, Adult female : skeleton. Montreal. Purchased of Mr. Wright. 



2. Oru/in of the dorsal fn behind the root of the ventrals. 



6. Leucosomus corporalis. 



Uyprinus corporalis, Mitchill, Am. Month. Man. ii. -a ^n ■ Bel-m, 

 ^e^v York Faun. Fish. -p. 213. ^ ^,-t^(ha,/, 



atromaculatus, Mitchill, I. c. 



Leuciscus atromaculatus, Dekay, I.e. p. 210, pi. 32. fio- 102 



iris. Cm. .^- Val. xvii. p. 2oo, pi. 49G. ' "' »' 



^^"^"So^ '*^™"^^^^'^*^''' Girard, P,-oc. Ac. Nat. Sc. Philad. 1856, 



Leucosomus cataractus, {Baird) Cope, Proc. Ac. Xat. Sc. Philad 18G1 

 p. 523. ' 



Semotilus hammondii, Abbott, Proc. Ac. Nat. Sc. Philad. 18(50 p 474 

 — — corporalis, Cope, Journ. Ac. Nat. Sc. Philad. xiii. p. .302,' pi. lo! 



D. 10. A. 10. V. 9. L. lat. 52-63. L. transv. 111/13. 

 The height of the body is contained four times and a half in the 

 total length (without caudal), the length of the head thrice and 

 tbree-hfths. Head three-fifths as deep as long. The diameter of 

 the eye is one-sixth of the length of the head, one-half of that of 

 the snout, and less than one-half of the width of the interorbital 

 space, which is flatfish. Snout obtuse, conical ; mouth rather wide 

 the maxillary extending to below the front margin of the orbit- 

 ,iaws nearly even in front. Suborbital ])ones of moderate width •' 

 pneorbital as long as deep, very much larger than the postorbitali 



