110 MANUAL OF THE MOLLUSCA. 
the rainy wooded region that borders the Caribbean Sea. The 
land snails of Central America resemble those of the Antilles 
in the prevalence of some characteristic genera — Glandina, 
Cylindrella and Helicina,—of which very few species are found 
on the northern Coast of the Gulf of Mexico. The Bulimi are 
numerous, but chiefly thin, translucent species. 
EV GTixe nest iretiecanssceses 33 Glan int ercesseneen series 25 Cistulamaeecesscas sonenias Fh 
IPTOSELPINGA Poses screees 1 Tornatellina ............ 1 Cyclophorus ............ 3 
SINUS! -seceecesoeerns 50 PUPS) Asscccseaeeverewese 1 Chondropoma .......+. 3 
SUCCINCA mee saneetenes. 6 Cylindrella ............ 20 Megaloma.....ccreceee 2 
Achatina (Spiraxis) .. 35 Cy ClOLUS in ssrsone-coenes 1 FL ClCINa taecessaeseanser 22 
Amongst the fresh-water shells are Neritina picta, Cyclas 
maculata, Corbicula convexa, and 7 species of Cyrena. From 
Mazatlan, Mr. Carpenter describes Cyrena olivacea and Mexicana, 
Gnathodon trigonus, Anodon ciconia (allied to the Brazilian 
A. anserina), Physa aurantia and elata, Planorbis sp. Melampus 
olivaceus. ‘Two brackish-water species, Cerithidiwm varicosum 
and Montagnei, are common to South America. 
21. ANTILLES. 
The West Indian Islands have supplied nearly 500 species of 
Helicide, a larger number than any province except the Lusi- 
tanian ; and aboye 260 Cyclostomide, or nearly three times as 
many as India. They are also richest in generic forms, and 
the climate is highly favourable to the multiplication of indi- 
viduals. The mean temperature of the Antilles is 59°—78°, 
and the annual fall of rain exceeds 100 inches in most of the 
islands. 
TCU esrsinecsssccsse ssi: 200 PIB fcssecsarcetcesseses 26 Cyclophorus ........00. 1 
SiEMODUS Merersasesisoses 2 Cylindrella) ss...-.<..-. 73 Cy Clovis evecare 14 
AO dsewseesansnissces eines 20 Clanisiliay epanneaeseeente 1 Megaloma,.......sss000 8 
IELOSCLPIN A eave seasiesis's 5 IB ale apnaresceseer steerer 1 PCH GINA! | seaccoseseenes 43 
UTS ess escesarescoeies 53 SUCCING Amer steeeeerecee 16 FNUCRIBUEW rndscemnbsocnooceC 17 
INGHAM, Bascsesesrss = 27 Chondropoma ......... 15 Trochatellay vscscaneases 16 
FIAMMA eer eorecesces 46 Choanopoma..........+ 53 TTICIM el aieasnaeteremnen 6 
SSPITURIS  s5neversanscees: 9 Adamsiella ............ 10 SLOASLOMIA seer ssensesies 20 
Tornatellina ..........+. 1 Cistulalineenstssesecre dy 36 Geomelania .......0006+ 21 
Probably every island has some peculiar species, and those 
of the great islands like Cuba and Jamaica are nearly all dis- 
tinct. To Jamaica belong the species of Stoastoma, Sagda, and 
Geomelania, the small sub-genus Lucidella, the Alcadias and the 
mass of beautiful Cyclostomas with a decollated spire and 
fringed lip (Choanopoma, Adamsiella, Jamaica, Chondropoma, 
