REPOHT OX ICHTHYOLOGY. 421 



'I'lu' color, in s]iirits, is dlivaceous on tliu head and IkmK- ahovo and laterally, and 

 bcdow and on the abdomen Avliitisli. The membrane between the rays of all the tins 

 is blackish, while the rays themselves are liii'lit. The bases of the anal and candal tins 

 are reddish. The teeth are of a dark-pnrplisli color. 



Two specimens of this species were obtained on Captain Simpson's expedition Ijy 

 Jfr. McCarthy. The precise localit}' is not known ; bnt it is snppo.sed that they were 

 obtained in Neltraska, 



NOTURUS, K.vF. 



Siiiioiiifniij. 



NOTURUS Riif. Aiiioiicuii .Mdiitlily M:it;;iziiii' ami Critical Keviow, vol. iv, p. 11, Nov., 1813. 



NoTciii's 7i(i/. Proflroiue de soizante-dix nouve.iiix Genres d'Animanx d^coii verts dans fiutcrienr des Et.Tts-Uiiis cu 



1818 in Jonrnal de I'liysique, vol. Ixxxviii, ji. -121, .June, 1819. 

 NoTCHt;.s n,if. lohtliyolofjia Oliieusis, or Natural History of l,ho Fishes iuliabitin;; llio Kiver Ohio aul its tributary 



streams, (). 67; ib. in Western Keview and Xliscellaneous Magazine, vol. — , p. lilil, .July, IS'JO. 

 XoTLlus fiaiid, Iconographic Kncyelop.Tdia of Science, Literature, and Art, vol. I, Zoology, p. aUi. 

 ScHiLBKoiDKS JShclri; Ichthyologi.T? Archipelagi Indici rrodronius, vol. i, Siluri (.\ctii Societalis Seicntiaroni Iiido_ 



Nederlandica', vol. iv\ p. 'J.">8. 

 Sil.i.'nr.s s]). Milihill, Aiiicricaii Moiilhly Magazine and Crilieal Keview, vol. i, p. '.iS'.l, and vol. ii, p. 'i'ii. 



Body moderatt'ly eloni;ated, anteriorly subcylindrical, and thence more oi- less 

 compressed. 



Head larux', elon<,''ated, conit' or cnneiform in protile, above ovate and depressed, 

 with a slight longitudinal fnrrow, branching into a transverse depression on the nape. 

 The skin is very thick, and entirely conceals the bones. The sujira-occipital has no 

 connection with the head of the second interspinal. 



Eyes of small or moderate size. 



Month anterior, large, and transverse. The upper jaw projects beyond the lower. 



Teeth snbnlate, and closely aggregated in a broad band in each jaw, which, in 

 the loAver one, is interrupted l)y a linear interval, and in the njjper one is continnoiis; 

 tlie band of the upper jaw is either abruptly truncated at each end, or prolonged 

 backward Ijy a continuation from the ])ostero-external angle. The lower band is, as 

 usual, attenuated toward the corners of the mouth. 



Branchiostegal memljraiie \\\\h nine rays on each side. 



l)or.sal tin situateil over the posterior half of the intei-\al between the pectoral 

 and ventral tins, with a very pungent, short, edentulous s|iine, and .seven branched rays. 



Adipose fin long and low, connected with the accessory rays of the caudal lin, 

 and not forming a sei)arate tin. 



Caudal fin very oliliquelv truncate or rounded, and inserted on anequall\- i>lili(picly 

 rounded base; the rays rapidly decrease in length inferiorl}-, and there are numerous 

 rudimentary ones, both above the caudal peduncle, where the anterior is united to the 

 adipose fin and forms a continuous keel, and below, where they advance considcralily 

 forwards. 



The anal fin is comparatively short, and rapidly increases in height for tlie lirst 

 half of its length. 



The ventrals are rounded, and each has one simple and eight branched ray.s. 



