12 
II. FresHwater SHELLS. 
LIMNZACEA. 
PLANORBIS COROMANDELICUuS, Beck; var. minor, Dunker in 
Triister’s second edition of Martini’s Conchylien.-Cabinet, pl. 6. 
f. 14-16. 
Diam. maj. 14, min. 11, alt. 8. 
The specimens sent by Dr. Harland and Mr. Mouhot agree very 
well with the figure quoted above. It is another question, which, 
however, need not be discussed here, whether they should really be 
regarded as a variety of Planorbis coromandelicus, which is much 
flatter. These shells are very remarkable for their resemblance to 
those of the North American group allied to P. trivolvis, Say, exhi- 
biting the oblique shape of the mouth, and the few inflated whorls 
with a blunt keel near the umbilicus, which is less deep than the 
‘centre of the upper side of the shell. 
AMPULLARIACEA. 
AMPULLARIA GLOBOSA, Swains.; var. 4. corrugata, Swains. 
Peristome orange. 
Diam. 63, alt. 59 mill. ; apert. 51 mill. longa, 35 lata. 
AMPULLARIA CELEBENSIS, Quoy et Gaimard (ampullacea of 
Linn. ’). 
Peristome whitish, speckled with dark brown. 
Diam. 63, alt. 63 mill. ; apert. 55 mill. longa, 35 lata. 
AMPULLARIA POLITA, Desh. ? 
Spire conic, produced ; the shell of a uniform black colour ; the 
peristome whitish. : 
Diam. 48, alt. 58 mill; apert. 41 mill. longa, 24 lata. 
All these three species I found in the collections made by Mr. 
Mouhot. 
PERISTOMACEA. 
PALUDINA TROCHOIDES, m. 
Testa trochiformis, acuminata, obtecte perforata, oblique striata, 
striis spiralibus subtilissimis decussata, interdum malleata, 
nitens; spira concava; anfr. 6, supremi plani, nigricantes, 
medii convexiusculi, obscure virides, ultimus medio carinatus, 
pallide virens, fuscia lata fusca supra carinam notatus, basi 
convexiuscula ; apertura diagonalis, rotundato-cordata ; peri- 
stoma breviter expansum, album, margine supero subrecto, colu- 
mellari incrassato, dilatato. Operculum corneum, concentricum, 
subovatum, extus rugis subtilibus obliquis sculptum. 
Long. sive alt. 20, diam. 22, alt. apert. 14 mill. j 
This species is very remarkable from its form resembling that of 
the trochiform Helix of the Eastern Archipelago (of the section 
Geotrochus) ; the structure and the appearance of the surface clearly 
eee 
