Quarterly Journal of Conchology. 305 



founded on a single specimen, since lost) i, Scabrina 2, 

 Cycloplwrus 20, Lagocheilus 2, Leptopoma i, Alegalomastoma i, 

 Rhaphaulus 2, Pupina 2, Helicina 2, Georissa 9. 



B, 5/am is not so well known as Burmah. The genera are very 

 much 'he same, except that Sesara, Sophina and Plectopylis do not 

 occur, or at least have not yet been found. Amphidromus is much 

 more abundant (13 species) Claiisilia less so (4). No Helicina or 

 Georissa has been found, and, on the other hand, there are 5 

 species of Realia. 



C. Cochinchi'na and Cambodia were until lately almost unknown, 

 and even now have only been very partially explored. The 4th 

 part of Morelet's ''Series Conchyliologiques " gives a resumfe of 

 all that is known of the fauna. The JVani/ice known are less 

 numerous than those of Burmah and Siam, but include the magni- 

 ficent JV. Cambojensis. Two species have been referred to Zoftifes. In 

 the true Helices there is i Flanispira, showing the affinity with the 

 East Indian Archipelago, Qjie has been referred to Ophiogyra, 

 probably Flect<pylis, as Ophiogyra is an American group. 1 here 

 is also said to be a Hadra, rather doubtful, this being rather an 

 Australian group. Stieptaxis is numerously represented (8 species) ; 

 also Amphidromus (11). Of Clausilia only 3 species are as yet 

 known, but i is the magnificent C. Mouhoti. In the operculate 

 shells the most remarkable are Myxostoma breve, from Poulo 

 Condor Island, and Helicina or Trochatella Mouhoti. 



4. The Andaman and Nicobar Islands. These islands are very 

 similar in their fauna, and both archipelagoes are related to the 

 Indo-Malayan Province. Naninoe are numerous, including, in the 

 Nicobars, the peculiar subgenus Sagdinella. Streptaxis and 

 Amphidromus are represented, but by few species. In the Anda- 

 mans there are 2 fine species of Spiraxis ? One Clausilia has been 

 described from the Nicobars. The operculate shells are numer- 

 ous, comprising the genera Cyathopoma (Andamans), Cyclotus 



