303 Mighels' Catalogue of 



edged. In one of his characters, Rafinesque is evidently 

 incorrect; he speaks of the "jaws without teeth;" when 

 the specimen is somewhat desiccated, or is examined by the 

 lens, both jaws are seen to be furnished with minute teeth. 



This delicate and beautiful species, which is occasionally 

 seen in the market of Cincinnati, is one of the most graceful 

 and active fish that inhabits the Ohio. In pursuit of food or 

 in sport, it frequently leaps from the water, from which cir- 

 cumstance it has received the name of Skip-Jack. It is a 

 great annoyance to the angler, as it drives away most other 

 kinds of fish ; but it will itself often take a baited hook. It 

 is esteemed as a good pan-fish. 



Art. XXVL — CATALOGUE OF THE MARINE, FLUVIATILE A^D 

 TERRESTRIAL SHELLS OF THE STATE OF MAINE AND AD- 

 JACENT OCEAN. By J. W. Mighels, M. D. Porlland, communicated 

 March, 1843. 



This catalogue is offered in the hope that it may be useful, 

 not only in extending a knowledge of the geographical distri- 

 bution of the species, but that some of the facts recorded may 

 be made available hereafter, in the investigations of geology. 

 I regret that it is not in my power to give more certain infor- 

 mation respecting the anatomy and habits of the molluscous 

 animals. Owing to the fact that a large proportion of the 

 marine shells are pelagic, and, therefore, rarely found con- 

 taining the living animals, it must be a long time before much 

 accurate information can be obtained respecting them. In- 

 deed, many of the commonest species of the mollusca are far 

 from being perfectly understood. This is especially true in 

 regard to most of the minute species, and certainly not untrue 

 in respect to many of the larger ones. Not having had suffi- 

 cient opportunities to study the mollusca successfully, I have 

 confined my remarks, mostly, to such facts as are most avail- 

 able and obvious. 



