56 Mr. R.J.L. Guppy on the Mollusca of Trinidad. 
It will be seen by the table that scarcely more than one-third 
(12) of the whole Aaa (33+) of species found in the island 
are peculiar to it. Of the remainder, sixteen are found in the 
Antilles and thirteen in South America, eight being common to 
the Antilles and the continent. 
Examples of all the peculiar species, and of most of the other 
shells mentioned in this communication, have been deposited in 
the British Museum. 
Table showing the Distribution of the Terrestrial and Fluviatile Mollusca 
of Trinidad. 
| North South Allied Species, where the Hoenig stfonnie a nnrre 
Division.| Division. species is peculiar. allied Species. y 
Neritina microstoma ..|  * Bead cr in es a enters 
Paludestrina spiralis ..| .. |P. candeana...... |S. America. 
Ampullaria urceus ....| * ciel Wiles shenaseishs islets nt WEMEZDELA. 
Ti CMMSD, Goisilsecars sil OF * oN 6 ote a 0 Sines ae ae ealse A ELEPICH 
Marisa cornu-arietis .. * be Fh Thea eevane opeutaneeve S. Amer.; St.Vincent. 
Adamsiella aripensis ..|  * rena xanthostoma, &e. ‘Jamaica. 
Cyciotus translucidus..) + Wiis cs oceans ....- |Venezuela. 
TUGACUS joe selsiie | .. |C. stramineus ....|Venezuela. 
Helicina nemoralis....)  * * H. jamaicensis .... |Jamaica. 
Ibarbatar vec... s. | ea! ek pees .....-./|Honduras. 
Physamivalis oe 3.30 ei) Bea git Oe faire Antilles. | 
Planorbis terversanus..|  * * Soden ODOC .-.- (Cuba. 
Vaginulus Sloanei ....) Fo roo ...+.. |Jamaica; Cuba. 
Succinea approximans... * adit isibe cca cad as .... |Antilles. 
Bulimus oblongus ....) * Be? Wid. iake sereoaetiae ..+++. |S. America; Antilles 
ZED bun cdectele ete 2k $6 eS a skew ..... |Antilles; S. America. 
fraterculus ......| * * DH OG0 00 ve ..+++. |S. America; Antilles. 
immaculatus # veeeeee o-+ee+e. (Antilles. 
multifasciatus. . * Boo Gocinolgio ofc S. America; Antilles. 
var. imperfectust, : Srl 
aureolus ........ ircree *  (B. limpidus ...... |S. America. 
octonoides ......| + diy Reet ets Keke .... {Antilles. 
caracasensis....../ od ell tees hdiogs 6 ...... |Wenezuela; Antilles. | 
Sten ae A ele cl tdi lee MNCUIATHS so. 0 Sho Va CEMt 
Plekocheilus auris-sciuri * | * { ip aecearene "| oO eWeneeaie 
Tornatellina lamellata..) MO Tale situ Fsenthoee .... |S. America; Antilles. | 
| Stenogyra octona...... hel es cS allies brtacrOmer ceca, Sev ocr S. America ; Antilles. 
Ennea bicolor ........| + 36 cove svees ces sew [Ste bOmas, indies, 
Vertigo Eyriesi ...... id eS At ice eats shod > o'6 Guiana. | 
Cylindrella trinitaria ..| —* -. |C.collaris......... -|Antiles. | 
Streptaxis deformis....| cP | WRIA .. |S. America. 
Simpulopsis corrugatus.| .. * |S. brasiliensis ..../S. America, 
Conulus vacans ......| * * |C.semen-lini ..../S. America. 
Anodon Leotaudi ....)  .. * |A. amazonensis.. ../S. America. 
+ Including one marked variety. 
+ This variety has been included in this list principally on‘account of its distribution. 
40 Upper Baker Street, N.W., Nov. 28, 1865, 
