146 DR. o, F. To:sr moellexdoiiff on [Feb. 20, 



P.S., March 17th, 1894. — Specimens representing the following 

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

 veniently be added to the list here : — 



36. Ehtnchoctox cie>'ei, Pet. 



rr.. Ad. sk. (^ . Zomba. 1/11/93. 



37. Canis mesomelas, Schr. 



rt. Ad. sk. c?. Palombi R., Shirwa Plain. 11/10/93. 



38. Nanotragtjs scopabius (Schr.). 

 «, h. Ad. sks. Shirwa Plain. 10/93. 



39. Certicapea arundinctm (Bodd.). 

 a. Ad. 8k. 6 • Palombi E. 6/10/93. 



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

 Gulf of Siam. By O. F. von Moellendorff, Ph.D.' 



[Eeceived December 4, 1893.] 



(Plate XVI.) 



Mr. C. Eoebelen, a well-known collector of orchids, to wliom 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 Land-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 ha\ang their nearest relatives amongst 

 the species of Siam, Tenasserim, and Perak. 



Pam. Steeptaxid.?:. 



1. StBEPTAXIS SIAMEIfSIS, Pfr. 



Streptaxis siamensis, Pfr. Mon. Hel. v. p. 419 ; Tryon, Man. 

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



Subsp. nov. DEPBESSA. — Biffert a ii/po s^nra mar/is depressa, 

 anfractu ultimo magis distorto, penultimo siihtus gJahrato, dente 



' Cniiiinunifafpd hv Mr. G. B. Sowrhrv. F.Z.S. 



