304 Quarterly Journal of Coiichology. 



from Europe is ver}' remarkable. The genus Cainpotiyx must 

 almost be included amongst the terrestrial shells, though bebnging 

 to the Limnmdce and Cremnoco7ichus, one of the genera of Liito- 

 rhiidcE, is purely terrestrial. This is after all only the extreme of 

 what we see in Littorina rtidis_ which is often found where only 

 the spray can reach. 



2. Ceylon. This island has special features. Besides a num- 

 ber of genei a also found in India, the following occur: Acavus 

 {Helix Juvmastoma, etc.) 8, Aulopoma 4, Leptcpoma 3. Cataulus 

 is almost exclusively Cingalese, 14 species occurring here and only 

 one on the mainland. On the other hand, Diplommatiua has 

 but few representatives, 2 only. The species are almost all differ- 

 ent from those of the mainland. 



3. The Transgangetic Peninsula. The fauna of this Region, 

 though on the whole very similar to that of India, yet is marked 

 by a still greater variety of the operculate genera, especially by the 

 strange form Hyhccistis. Amphidromus also appears in numbers, 

 and Clausilicc are more numerous and of finer forms. We divide 

 this region into 



A. Bumiah with the Tenasserim Provinces. 



B. Siain with the remainder of the Peninsula of Malacca. 



C. Cochinchina and Cambodia. 



A. Biirmah. Nanina is very well represented, including the 

 peculiar subgenera Srpltijw 4 species and Scsara 7. There are 

 some fine Vltriiice (Helicarion) as V. prccstans. In the genus 

 Helix the s.g. Flecfopylis is chiefly remarkable. Streptaxis has 9 

 species. The curious genus Pleciotropis occurs here (3). There are 

 no less than 1 4 species of CMusilia. Electro still occurs, but not 

 so numeious as in India and Ceylon (5 species). The operculate 

 fauna is particularly rich, comprising Opist/irporus i, Rhoistoma i, 

 Spiraculwn 2, Fterocydos 4, Alyaius 17, Hybocistes i, Dij Ij/k- 

 viatina 7, Palaina i, Clostophis (rather a problematical genus, 



