Terrestrial Mollusca from Trinidad. 439 



This species is very variable in dimensions as well as in its 

 other characters, as the following measurements of three varie- 

 ties will show : — 



«. Leugtli 13 millims., breadth 85, height of aperture 3. 



y- V 9 )> )) 2 „ „ li 



This is generally a longer and larger shell than 8. octo- 

 noides, to which I had previously referred it. The var. 7 also 

 is longer, though more slender, than the Jamaican species. 

 But S. plicatella is really more near to 8. suhula, Pf. In 

 uniting the three forms now described under one name, I am 

 guided by the characteristic striation and by the gradation of 

 forms. 



3. 8tenogyra coronata, n. sp. 



Testa obsolete rimata, siibulata, cylindrico-fusiformis, albida vel 

 cornea, costellibus distantibus ornata ; anfr. 8-9, vix convexi, 

 superiores lente accrescentes et gradati, inferiores subaequantes, 

 ultimas parum arctatus ; sutura impressa ; apertura angusta, 

 elongato-ovalis ; peristoma simplex, marginibus callo jimctis. 



Long. 7 millim., lat. 2; apert. alt. 1|, lat. |. 



Shell obsoletely rimate, subulate, fusiformly cylindrical, 

 white, adorned by low, distant, somewhat sinuate, longitudinal 

 riblets, of which there are about eighteen on a whorl ; whorls 

 8-9, scarcely convex, the upper ones step-like, slowly increas- 

 ing, the lower ones nearly equal, the last somewhat narrowed; 

 aperture narrow ; peristome simple, its margins joined by a 

 narrow callus on the body-whorl. 



Allied to 8. gracillima, Pfr., Cuba. The group Melaniella^ 

 of which this is a member, appears to be related to Cylindrella^ 

 whilst the forms like 8. plicatella and 8, octona seem to ap- 

 proach 8piraxis. 



4. Zonites Ouildingi, Bland. 

 Stenopus Guildingi, Bland, in Ann. Lye. N. H. New York. 



I would refer to what I have said under Part II., Grenada, 

 when treating of Conulus vacans, for my reasons for rejecting 

 the name 8teriopus. 



This shell is so like Hyalina cellar ia^ MlilL, that, were a 

 dozen examples of each mixed together, it would be difficult 

 to assort them. The animal differs, according to Bland, in 

 having a caudal appendage, and is therefore referable to Zo- 

 nites, and not to Hyalina. I have only found this species on 

 the heights of Aripo, 2000 to 2700 feet high, and have had no 

 opportunity of examining the animal. Mr. Bland's examples 

 were from Porto Cabello in Venezuela. 



