GASTEROPODA. 
the extremity; anal siphon longer than in Dentaliwm, not 
fissured. 
Distribution, 2 species. China; Atlantic. 
Fossil, 7 species. Cretaceous-Miocene. Paris; United States. 
ORDER II.—PULMONIFERA.* 
Famity I.—HELICcIDz.t 
SopHinA, Benson, 1859. 
Type, 8. schistostelis, Bens. 
Shell like Helix ; columella callous, with a basal slit. 
Distribution, 3 species. Moulmein. 
OYLINDRELLA (p. 293). 
Animal with no buccal plate; the lingual dentition varies 
considerably in different species; in QO. scceva, Guild., the for- 
oo. 1. 26 
mula is asso! the central plate is small, obtusely pointed, 
the laterals are uncinated, joined two by two, upper edge 
fringed. 
‘© C, Goldfusst possesses 4 lamellee on the outer wall of the 
whorls. The axis of C. turris and of some other Mexican spe- 
cies is a highly polished tube, the young shells of which must 
haye a wide open umbilicus.’’—(Bland.) 
MAcROcERAMUS, Guilding. 
The genus has affinities with Bulimus, Pupa, and Cylindrella. 
Animal with an arcuate and striated buccal plate; lingual 
dentition distinct from that of Cylindrella; in M. signatus, 
bai 27.1.27 
Saino? the central plate is narrow, with an obtuse 
tooth, laterals with one prominent tooth sup- 
porting two denticles anda small one at the ) 
base. Q 
Shell with the axis simple as in Bulimus ; 
in 17. amplus a lamella revolves on the axis 
within the lower whorls. Fig.16. 
Distribution, 30 species. The genus belongs Central laieiaus 
to the West Indian fauna, and has its greatest 4, signatus (Mozsa). 
development in Cuba and Haiti. 
AcHATINA.—Sub-genus, Geostilbia, Crosse, 1867. 
Type, G. Caledonica, Crosse. New Caledonica, 
* See p. 285. t See p. 288. 
' 41 
