EErORT OX ICHTllYOLOC.Y. 423 



"Schtibeodes Bleeker* Pinna dorsalis caudali quam capiti approximate; analis 



caudali contigua. Cirri X." 



The diagnosis relating to the dorsal fin is erroneous. Mitchill not having men- 

 tioned the position of that tin, Bleeker must have assumed thai the caudal was not 

 much more than normally extended on the dorsal region of the peduncle, and, noticing 

 the statement concerning the commencement of the tin an inch hehind the dorsal, was 



equally to Blocker's. 



The publication of Pvafincsque's diagnosis of the genus Noiurus soon succeeded 

 Mitchill's description of his Sihmis fpjrimis. Ratinesques first notice of his genus is 

 to be found in volume fourth of the "American Monthly .Magazine and Critical Re- 

 view". It is there said to "differ from SUurm by having the second dorsal connected 

 with the tail, or forming a single lin". The description of the single species (NatmrW 



the barbels, and the number of rays, most of which are generic characters. Uafinesque's 



&C", and is substantially the same as that in the Magazine. As The work in which 

 the " Prodrome" is published is inaccessible to most American students, we add the 

 description in a note.* The name of the species is changed by Katinesquo to Xotttrus 

 luteus. The genus is for the third time described by Rafinesque in the "lehthyologia 

 Ohiensis". It is there said to "differ from the genus Plotosus of Lacepedo by having 

 the anal fin free", although there is really no connection between the two genera. The 

 remainder of the description differs little from those previously noticed. The specific 

 name of Notion* Jlarus is restored to the species. 



KOTURUS OCCIDENTALS, Gill. 



The greatest height is equal to nearly a sixth of the total length, and less than 

 the greatest breadth outside of the bases of the pectorals. The height of the caudal 

 peduncle behind the anal fin slightly exceeds a tenth of the length. 



The bead is subcuneiform in profile, and above presents an oval form; at the 

 cheeks behind the eyes it appears to be swollen. The length of the head enters less 

 than four times (0.23) in the total length. The breadth at the opercula nearly equals 

 a fifth of the entire length; that between the cheeks behind the eves is about the same. 



The distance between the eyes equals a tenth of the length, and is of nearly the 

 same extent as that between each eye and the middle of the snout. The eyes them- 

 selves are small, a diameter not much exceeding a seventh of the head's length. 



again remind the reader, ate founded on error. 



"Siluru gyrinns,d. .r Mitehill n 1-1- i ds kort 1 k dn.di lo.-nd 1> - in-ven, korut mij voor tot de Trieho- 



zeer nabij de stoart vin eindigen. Overigens 8 voeldroden, 7 rngvin en !<'. aarsvmsrralen. Misseheen een midden vorm 

 tusscben Tricbomycterus en Nematogenys." 



-*18. NOTURUS. (Abdominal) different des genres Silurus et rimrh»ln* pai na-euire eamlale d.'eurrente sur le dos 

 jusqne vis-a-vis l'anus, et tenant lieu de deux nageoires doraalea adipeuse*. X. XuUm, corps conique comprimee, tete 

 deprimee, 8 barbillons, macboire Bupeneure plus longue, nageoires dorsale et pectorales, queue tronqnee, ligne laterale 



disposes comme dans les Pimelodes de l'Ohio. Le 8 D est nne autre espece de ce genre. 



