SS2 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



fork-tailed species, commonly referred to Amiiu-HN, the two bones are 

 more or less close together; in some species apparently joined in the 

 young. but separated in the adult; in others apparently slightly sepa- 

 rated at the surface and joined under the skin. In but two species. 

 fin-calns and punctatus, is there a continuous bridge formed at all ages. 

 In view of the complete intergradation of this character, we have re- 

 tained the name Ainhtrux for the species with truncate caudal and the 

 interspinal and supraoccipital wholly separate, and Ictalurnx for those, 

 \vitli forked caudal and the two bones in question joined or approxi- 

 mated. The only other alternative, and a not unreasonable one, is to 

 refer all these species to one genus, 



On page 108, instead of Ictalurus laciiNtris, read: 

 1O6. I. iiigricaiis (Le S.) Jor. 



The "Gatlw lacustris"* (Walb. Artedi, Pise. 1792, 144) can hardly 

 be identified with any fish. 



Page 110. To the description of Ariux fells, the following may be 

 added: 



Bands of palatine teeth large, not prolonged backward over the 

 pterygoid region ; fontanelle prolonged backward in a narrow groove; 

 occipital process long, narrow, keeled. Pectoral rays I, 0. 



Aria* cquestrix I>. & (>., is not distinct from A.felis, and should be 

 erased. 



Page 111. Instead of Plectoxpomlyli read Order L. EVENTOGNATHI. 

 Tin- latter name is unobjectionable, and has priority of date. 



Page 113. We do not believe that Ictiobus, llubalicltthyx. and Carpi 

 iili-x ean be maintained as distinct genera, and think it preferable to 

 unite the three under the earliest name, Irtiolm*. In its dentition, 

 frfiolinx is intermediate between (Vrr/mu/r.v and 7,'Wm//rA/A//.v, and in 

 structure of mouth Bubalichthys stands between the others. 



\\V have examined the original manuscript note-book of IJaliuesijiie. 

 containing the descriptions which were afterwards printed in the Ich 

 thyologia Ohiensis. In this book is a drawing of his " Iclinhnx /in/ml us." 



' II is ilcsrrilinl as tiilliiws : 



a ti<l UN lurimtrix, Aiiii-ric:iiiis M;il licinc^, An^lis l.ninl <<>il. I 'riiiianl . Arct. Zool. 

 Jninxl. p. I'.n. Corims i ri|u-il;ilr, auperne sub spadiceam, inlrnir ^riscuin; cirri trcs 

 in iii;iinliliiil:i iiitrriin-f, i|ii<iniiii nirilius Imi^il iidinc ilnos alios vinrit." 



Tin- MailiriiK - in I. .mil i 'mi " ,it" iviiiuint is siiid by Biohardaon to be a oat-fish, 



:iiid it may have IHTH /. itiiiricuitx, lint the (It-scription is wholly iusiilliciciit. 



