GUPPY— LAK2 AND PRESHWATER SHELLS OP TRINIDAD* 2'f 
Merid. Mollusques, pi. 22, f. 1-7). It is, however, much 
larger, darker, and more strongly marked with brown and 
orange, and the granular reticulations of the surface are 
much coarser. 
Amjphibulima felina inhabits similar stations to Amjph, 
unguis , viz., the stems and leaves of submerged plants. It 
cannot survive long if plunged into water, nor can it live 
if removed from the neighborhood of that element. I 
have found it near the head of the Maraval river only. 
Cychs incur v a n. sp. 
Shell oval, transverse, inequilateral, regularly and dis- 
tinctly concentrically striate, generally marked with irre- 
gular black dots, usually rather high posteriorly ; valves 
rather ventricose, with a broad round carina running from 
the umbo towards the posterior angle ; umbones prominent, 
rather approximate, hinge line nearly straight — length G 
mill., height 5 mill., thickness 3 mill. 
This species appears to be very distinct from any hither- 
to described, and in form it is not unlike an Anodon. Old 
specimens are nearly black, and have the umbones eroded. 
Compared with the only other known Trinidad species of 
the genus, this is much larger and thicker ; it is also 
more oval and longer in proportion to its height, and the 
black markings also distinguish it from C. punctifera , 
which, according to Temple Prime, is a Pisidium . Of the 
latter shell I have lately acquired specimens identical in 
appearance with the type, but almost or quite destitute of 
the points from which the name is derived. 
Cyclas incurva was found in the Chatham River at Erin, 
on the South Coast of Trinidad — but 1 have received ex- 
amples of a shell without name, from M. Adolphe Schramm 
of Quadelupe, which I am not able te distinguish from ours. 
