180 LANTJ AND FRESHWATEK 



flume is very long, quite free of spines on the side, 2 or 3 large ones 

 only at the base of the capsule, which is elongately oval, with very 

 transparent sides and with the usual cap-like terminal end. It is 

 thus on the mould of spermatophores of species of the genera 

 Girasia and Austenia &c. figured in this work, but shows very 

 interesting variation in minor detail, supporting the conclusion I 

 have arrived at, that this species resplendens cannot be retained in 

 MacrocJilamys, but forms a good and distinct genus, which I name 

 Saril~a. 



In the 'Proceedings of the Malacological Society,' 1899, p. 250, 

 I referred to the unsatisfactory position of this species if retained in 

 Macrochlnmys, as follows : — 



" Passing south-eastward towards the confines of the area I have 

 defined for Macrochlamys, we find a change commencing in M. re- 

 sphndens (Section E) of Tenasserim ; we have the shell-lobes still 

 present, but the generative organs are so modified that the coiled 

 ciEcum has gone and the male organ is more like that of Hemi])lecta 

 {humphreysiana). In a large Siamese species we find the same 

 features, and I think we are here beyond the range of the Indian 

 type of the genus." 



As will be shown further on, the animals of resplendens and of the 

 Siamese species are much nearer that of Xesta type ciirlnn, but the 

 conchological differences are very great. The closely-wound depressed 

 shells of resplendens and its allies present characters which cannot 

 be overlooked, and they help considerably in separating this group 

 of the Zonitidae from Macrochlamys on the one hand and Xesta on 

 the other. 



I have been able to examine two species from Siam, both of which 

 in shell-character approach resplendens, Phil., the Mergui shell, 

 particularly in the narrow closely- wound whorls. 



The molluscan fauna of Burma, Tenasserim, and the Malay Pen- 

 insula is so closely related to that of Siam, I must here refer to these 

 species in some detail. One species was collected by Captain Stanley 

 Flower, the other was collected by Mr. W. Mahon Daly and sent 

 to Dr. W. T. Blanford. who handed it to me. The latter shell was 

 very much broken, and in extracting the animal only the apical 

 part was left, and I was for long unable to determine the species. 

 The animal was soaked out and found to have a well-marked over- 

 hanging lobe at the extremity of the foot ; a large, rather broad, 

 right shell- lobe ; the rest of the mantle-zone was in a decomposed 

 state, and only a portion of the penis was seen. The jaw was dark 

 brown with a central projection. The radula was very interesting, 

 for it recalled that of Xesta citrina. 



Quite recently I have come across in Dr. Blan ford's collection the 

 shell he recorded as Macrochlamys pumicata, Morelet, in a paper, 

 " Land and Freshwater Mollusca from Siam," published in the 

 • Proceedings of the Malacological Society,' part 4, April 1903, based 

 on a collection formed by Mr. W. M. Daly. The remnant in my 

 possession agreed with this shell, but very fortunately the dried-up 

 animal still remained, the foot protruding in a very perfect state. 



