100 MANUAL OF THE MOLLUSCA, 
few of the Indian species are common to China and the Asiatie 
Islands, or even to Ceylon. The shells of northern India 
“resemble those of the Lusitanian region; in the south they 
approximate more to the large and yividly coloured species of 
the AsiaticIslands. In the Himalaya land shells are numerous, 
and ascend as high as the region of’ Junipers and Rhododen- 
drons, 4,000—10,000 feet above the sea. 
TELS Heo sane aos Beee enon 3 IEBNDE) sononsdosneascaotone. 7 Cyclophorus ........000 26 
MACLIANTIGD ne scans cemsiiecce’s 46 MASI ve etenceatecsses Leptopoma .....-..000. 1 
PATIOPEANLA (c.c.c<56625 6 RVAtTING, cesveccsel secetors 9 PLETOCYCIUB) ss-cenee-e lO 
SSELEPUAKIS ...c.cavessenes 3 SUCCIMCAmesssesetaceses a Cy clotus? ci-c-.n-eseee 
RST TUS warsorcesess0s 08 45 Parmacella .c.ssscssas.0 2 Megalomastoma ...... 4 
PAIG HELENA essere s's2'2o5 16 Cyclostoma, .........+0 38  Diplommatina ......... 3 
Parmacella and Vaginulus are found in India, and the typical 
fresh-water species of Oncidium. Ordinary forms of Limncea 
and Planorbis are abundant, and there is one species of Ancylus. 
Physa occurs only in a fossil state, or is represented by the 
singular Camptoceras of Benson. Hypostoma Boysti, Auricula 
Jude, and Polydonta scarabeus are also Indian forms. 
The gill-breathing fresh-water shells of India are very 
numerous, especially the Melanias and Melanatrias, and species 
of Pirena, Paludomus, Hemimitra (retusa), Ampullaria, Paludina, 
Bithynia, Nematura (deltee), Assiminea (fasciata), Neritina (par- 
ticularly crepidularia and Smithu) and Navicella (tessellata). 
The brackish-water species of Cerithidium, Terebralia, and 
Pyrazus are mostly common to India and North Australia. 
The fresh-water bivalves are a few ordinary forms of Unio, 
3 species of Cyrena, a Corbicula (of which 6 species haye been 
made), Cyclas Indica, Arca scaphula, Glaucomya cerea, and Nova- 
culina gangetica. 
Ceylon. ‘The land-shells of Ceylon have been investigated by 
Mr. Benson ; they most resemble those of the Neilgherry hills, 
but are nearly all specifically distinct, and even some of the 
genera are pecular. It seems entitled to rank as a province. 
Helix Waltoni and Skinneri, are examples of the most charac- 
teristic form of Helices; the Vitrini-form type (Nanina) is also 
common. H. hemastoma, one of the most conspicuous species, 
found on trees at P. Galle, is common to the Nicobar Islands. 
The Achatinas belong to a distinct section (Leptinaria, Beck), 
also represented on the Continent. Some of the Bulimi approach 
the Philippine forms. 
WACK s esossoeseancetpsden 46 SUCCINCH Msessessearerses 1 Pterocyclus .........+« Pi ta) 
PRAM D cess cseteseoses ve 9 PODS secs cetevset serecers 3 AULOPOMNA 2... ceeesereee 4 
Vitrina reper Pu JA CHAMING |e steesse ress: 2 oo Leptopoma .....ccceres 5 
SILCPUAKIS ses ccovecssess> 2 Cyclophorus ...... verse. 12 Cataulus) ccoscsssaceasvs 10 
BuliMUs,, sssssesesesseeee 1B 
