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 :— 
#. Length 13 millims., breadth 33, height of aperture 3. 
B. » 1d ” ” 33 ” ” 2 ‘ 
+ ” 9 ” ” 2 ” ” 13 
This is generally a longer and larger shell than S. octo- 
noides, to which I had previously referred it. The var. y also 
is longer, though more slender, than the Jamaican species. 
But S. plicatella is really more near to S. subula, Pf. In 
uniting the three forms now described under one name, I am 
aig by the characteristic striation and by the gradation of 
orms. 
3. Stenogyra coronata, 0. sp. 
Testa obsolete rimata, subulata, cylindrico-fusiformis, albida vel 
cornea, costellibus distantibus ornata; anfr. 8-9, vix convexi, 
superiores lente accrescentes et gradati, inferiores subequantes, 
ultimus parum arctatus; sutura impressa; apertura angusta, 
elongato-ovalis ; peristoma simplex, marginibus callo junctis. 
Long. 7 millim., lat. 2; apert. alt. 13, lat. 4. 
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. 
_ Alhed to S. gracillima, Pfr., Cuba. The group Melaniella, 
of which this is a member, appears to be related to Cylindrella, 
whilst the forms like S. plicatella and S. octona seem to ap- 
proach Spiraxis. 
7 4. Zonites Guilding?, Bland. 
Stenopus Guilding:, Bland, in Ann. Lyc. 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 Stenopus. 
This shell is so like Hyalina cellaria, Mill., 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. 
