344 Mighels' Catalogue of 



Genus Columbella. Lam. 



C avara, Say. I found a single specimen of this species 

 in a haddock's stomach taken in Casco Bay. 



Genus Terebra. Lam. 



T. ( Cei'ithium,) cUsIocata, Say. (T. jjetitii, Keiner.) 

 Through Dr. Ray 1 have received a specimen of this shell. He 

 found it with several more, on the shores of Passamaquoddy 

 Bay, near Eastport. He informs me he has found it at several 

 places in that vicinity, and has no doubt that it inhabits that 

 locality. 



It thus appears that there are seventy-nine genera, repre- 

 sented by two hundred and twenty-five species, to which might 

 be added with propriety, all the northern species included 

 in Dr. Gould's Report, (Invert. Mass.) with twenty-five or 

 thirty fossil species noticed by Dr. Jackson in his 2d Annual 

 Report on tlie Geology of Maine, and six or eight others 

 which have come into my possession through fishermen, who 

 found them on some of the eastern islands. 



The occurrence of several species on this coast, that inhabit 

 the south shore of Cape Cod, and not Massachusetts Bay, is 

 a fact worthy of notice. How is this to be explained ? Does 

 the Gulf Stream have anything to do with it ? Is there a cur- 

 rent flowing around that cape, in an easterly direction, con- 

 nected with or independent of the Gulf Stream ? and if so, 

 where does it terminate? Would it not, more probably, ter- 

 minate on the coast of Maine than on the coast of Massachu- 

 setts ? If such a current does exist, either constantly or 

 periodically, would it not be a satisfactory solution of the 

 problem ? I have but little doubt of the existence of such a 

 current, and that it acquires a mighty energy during the preva- 

 lence of southerly winds. The effect of it in transplanting 

 marine productions will readily occur to every mind. It is 

 well known among naturalists that several species of tropical 

 shells occur on the coast of Great Britain and Ireland, whither 



