1881.] Mollusca of the Indo-Malayan Fauna. 127 



walls at 300 feet above the sea, two from Borneo, one from Amboyna, oiii 

 from the New Hebrides, one from the Pelew Islands, three from the Nicobars, 

 and two (possibly more) from the Andamans. I can scarcely believe the 

 genus does not occur in Sumatra or Java, though it has not yet been re- 

 corded from either, or indeed from the Malayan Peninsula. 



Another remarkable " Indian" type is the Cyathopoma blanfordi, 

 H. Adams, which was first discovered by myself at a considerable elevation 

 on Mahe one of the Seychelles. This is undoubtedly an exception to my 

 theory that the " Indian" forms of the Madagascar province show a closer 

 connection with Sumatra, &c. than with India proper : species of Cya- 

 thopoma {sensu lato) being numerous in South India and Ceylon, and 

 also existing on the Bombay and Golconda Hills, as well as at Darjiling, 

 in Assam, and a single species, (fide cl. Theobald) in the Shan States ; the 

 genus hitherto not being known from any other region. But elsewhere 

 in this paper I have endeavoured to prove that the genus Diadema of 

 Pease from the Pacific Archipelago is not really separable, and I can 

 also confirm the validity of Benson's species Cyathopoma tignarium from 

 the Andamans, which Mr. W. T. Blanford has lately called in question, 

 as I have received several living specimens from my energetic corre- 

 spondent Mr. F. A. de Roepstorff, who has also sent me a single specimen 

 of the true Omphalotropis distermina, Benson, as justly discriminated from 

 its much commoner ally by Mr. Blanford, who has named the latter 

 O. andersoni. The occurrence of Cyathopoma procerum, Blanford, at 

 Beypore, close to the sea, is also worthy of note, in regard to the geo- 

 graphical distribution of the genus. 



As well as I can judge, there is no fossil represented in Sandberger's 

 1 Vorwelt,' which presents any resemblance to Cyathopoma. The genus 

 is of such small size that it may have been easily overlooked hitherto in 

 the Malayan province ; — Blan ford's genus Cyclotopsis, I consider as on 

 an altogether different footing ; I regard it as a strictly African genus, 

 of which two species have made their way to India, two others to the 

 Comoro Islands, and one {C. conoideum, Pfeiffer) to Mauritius ; Sowerby's 

 habitat " Seychelles" for this last is undoubtedly erroneous and should 

 be altogether ignored. The two large Seychelle species of Stylodon 

 {Helix) have their nearest ally in H. cepoides, Lea, of the Philippines, and 

 are all three evidently allied to the species of Phania, Albers {pars = 

 JEucochlias, Theobald), of which forms are known from Formosa {IT. siuin- 

 hoei), Tavoy {H. saturnia), Solomon Island, Cambodia, Moluccas, Khasi 

 Hills, &c. 



Mr. Wallace in Vol. II, p. 538, of his ' Geographical Distribution of 

 Animals,' 1876, Prof. Sandberger in his 'Land &c. Conchylien der Vorwelt,' 



