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Show 146 DR. o. p. VON MOELLENDORFF ON [Feb. 20, P.S., March 17th, 1894.-Specimens representing the following species have arrived siuee the above was written, and may conveniently be added to the list here :- 36. EHYNCHOCYON CIRNEI, Pet. a. Ad. sk. cf. Zomba. 1/11/93. 37. CANIS MESOMELAS, Schr. a. Ad. sk. cf • Palombi E., Shirwa Plain. 11/10/93. 38. NANOTRAGUS SCOPARIUS (Schr.). a, b. Ad. sks. Shirwa Plain. 10/93. 39. CERVICAPRA ARUNDINDM (Bodd.). a. Ad. sk. cf • Palombi E. 6/10/93. 2. On a Collection of Land-Shells from the Samui Islands, Gulf of Siam. By O. F. VON MOELLENDORFF, Ph.D.1 [Eeceived December 4, 1893.] (Plate XVI.) Mr. C. Eoebelen, 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 ; Tryon, Man. Pulm. i. p. 79, t. xv. fig. 73. Subsp. nov. DEPRESSA.-Differt a typo spira magis depressa, anfractu ultimo magis distorto, penidtimo subtus glabrato, dente 1 Communicated by Mr. G. B. SOWKRBY, F.Z.S. |