'GUPPY — MOLLUSCA OF THIftlBAD. 
d5 
'what I demonstrated in 1864, namely that Neritina is re-- 
-lated to the family ITelicinidce among terrestrial operculata'; 
and in the paper by Mr. Hogg and myself read to the Lin- 
nean Society wo have ‘shown that Adams iella (possibly with 
all the Cyclostomidce) belongs to the same group. Paludes * 
trim seems to be most nearly akin to the group containing 
Melania ; but SJcenea , a marine genus, must come under tlio 
same head. 
But few othor *remarks remain for mo to mako. I have 
altered the namo Vaginulus Sloanei to Veronicclla leevisj be- 
cause tlio figures and descriptions of the latter seem to be 
most applicable to our Trinidad form. Tho dimensions of 
the different shells aro given in millimetres, and they aro 
takon from good examples. 
Tho following aro tho families, according to Woodward’s 
arrangement, represented in Trinidad : — 
A. Ixoperculata. 
3 / Oncidiadro ( Veronicclla ) 1 species. 
-g | Holicidee ( Succinea , Bulimus , Bulimulus, Plekoclieilus , 
) Tornatellina , Stenogyra , Cylindrella , Ennea , Vertigo , 
H \ Strcptaxis , Simpulopsis, ConulusJ 18 species. 
Amphibious — Auriculidco ( Melampus, Pedipcs) 3 species, 
bluviatilo — LimiiccidcO ( Planorbis , Physa) 2 species. 
B. Operculata. f 
| Cyclophoridro ( Cyclotus ) 2 species. 
£•2 | Hellicinidte (JlelicinaJ 2 species. 
Eh 4-1 ( Cyclostomidce ( Adamsiella) 1 species. 
# d . f Noretidce (Neritina) 1 species. 
rg j Paludinidse ( Ampullar ia, Marisa ) 3 species. 
£1 ^ ( Melaniadce (Paludestrina) 1 species. 
