230 GtrPPY : MOLLUSCA OF TRINIDAD. 



74, f. 4 — 6). Ours is a little longer in proportion to its depth, 

 but the likeness is otherwise pretty close. It is 100 mill, in 

 length by 55 mill, in depth, and in thickness it is about 33 mill. 

 It is to be regretted that so fine a shell is so rare with us. It 

 is not, I believe, very rare in the localities where it exists, but I 

 have never been able to procure more than two or three 

 specimens. 



To the foregoing list of freshwater shells I have in former 

 publications added the name of Neiitina microstoma Orb., which 

 is an inhabitant of some of our streams. I have never found it 

 more than a mile from salt water. The genus contains fresh- 

 water, estuary, and marine species. It furnishes to our marine 

 fauna N. meleagris Lam. and N. viridis L. Crosse includes 

 N. meleagris in the synonymy of N. virgiiica L., and he 

 may be right. But I have been in the habit of regarding these 

 as distinct. Certainly the figure of N. virginea, given by 

 D'Orbigny (' Voy. Amer. Merid.,' pi. Ivi., t. i — 3), represents 

 a specimen of iV; ?//^/^i7^m, and I have examples from some 

 of the Antilles as N. meleagris which approach N. virginea very 

 closely. On the other hand, the N. meleagris which inhabits 

 the muddy shores of the Gulf of Paria is considerably different 

 from the N. lirginea of the Antilles. 



The persistence of authors in referring to Trinidad species 

 which do not belong to the island, induces me to add a few 

 words on the point. 



In my paper in the " Annals and Magazine of Natural 

 History" for January, 1866, I gave a list of species wrongly 

 ascribed to Trinidad. These were Cydostomiis citrinus Sow., 

 Helix discolor F^r., and Helix perplexa Fer. I find in a paper 

 by Smith and Fielden in the ' Annals and Magazine of Natural 

 History' for September, 1891, that the latter shell is again 

 attributed to Trinidad. It is not found here nor in Barbadoes. 

 Governor Rawson's specimens came from Grenada, which is 

 the true habitat of the species. 



J.C, vli., Oct. 1893. 



