146 DR. O. F. TON MOELLENDOREF ON [Feb. 20, 



P.S., March 17th, 1891. — Specimens representing the following 

 species have arrived since the above was written, and may con- 

 veniently be added to the list here : — 



36. Rhynchocyon cirnei, Pet. 



a. Ad. sk. <$. Zomba. 1/11/93. 



37. Canis mesomelas, Schr. 



a. Ad. sk. c?- Palombi K., Shirvva Plain. 11/10/93. 



38. Nanotragus scoparius (Schr.). 

 a, b. Ad. sks. Shirvva Plain. 10/93. 



39. Cervicapra arundinum (Bodd.). 

 a. Ad. sk. <3 . Palombi R. 6/10/93. 



2. On a Collection of Land-Shells from the Samui Islands, 

 Gulf of Siara. By O. F. von Moellendorff, Ph.D. 1 



[Received December 4, 1893.] 



(Plate XVI.) 



Mr. C. Roebelen, a well-known collector of orchids, to whom I 

 am indebted for a great number of interesting shells from various 

 parts of Eastern Asia, visited, in 1888 and 1892, the small group 

 of islands south of Bangkok, named by the Siamese Ko-Samui, 

 and situated near the coast of the Malay Peninsula at its narrowest 

 part. The group, from which, so far as I know, no Laud-Shells 

 were hitherto known, consists of several small islands, the largest 

 of which is called Samui. The rock seems to be calcareous 

 throughout : at least one small island, called Kwangtong, is, 

 according to Mr. Eoebelen, one mass of apparently madreporic 

 limestone. 



As might have been expected from their geographical position, 

 the fauna of the Samui group is essentially Malaccan, several 

 species being common to the adjoining mainland, and most of the 

 forms peculiar to the group having their nearest relatives amongst 

 the species of Siam, Tenasserim, and Perak. 



Fam. Streptaxid.e. 



1. Streptaxis siamensis, Pfr. 



Streptaxis siamensis, Pfr. Mon. Hel. v. p. 449 ; Try on, Man. 

 Pulm. i. p. 79, t. xv. fig. 73. 



Subsp. nov. depressa. — Differt a typo spira magis depressa, 

 anfractu ultimo magis distorto, penultimo suhtus glabrato, dente 



1 Communicated by Mr. Gh B. Sowerby, F.Z.S. 



