1881.] Mollusca o/ the Inch-Malayan Fauna. 115 



Pease, by von Martens in the Zool. Record for 1871, p. 102 ; I have 

 extracted the operculum and find it to be something like that of Omphalo- 

 tropis, of thin, horny texture, with 4 to 5 well defined whorls. 



The operculum of ? Diadema rotella, Pease, a small smooth form, 

 something like a miniature Lepfoj)oma luteum, is not as yet known, and 

 it is not present in our single Museum specimen from Rarotonga. 



Cyathopoma (Jerdonia) im perforatum, n. sp. 



Bcddome, P. Zool. S. 1875, p. 449, as " probably a new species" from the Anamal- 

 lays at 6600 ft. (under Cya. datum, Bedd.). 



There is a single specimen in the Museum, for which we are indebted 

 to Colonel Beddome ; the species is at once distinguished by its being the 

 only described species of the genus with an imperforate base ; I hope to 

 give a figure and more detailed description later on. 

 Alt. 2i, diam. 2 mil. 



Cyathopoma shevaroyantjm, Beddome, PL VI, Fig. 7. 

 Proc. Zool. Soc. 1875, Shevaroy and Yellagherry Hills (Salem District). 

 I have thought it well to publish the three figures of this interesting 

 form which had been prepared under the directions of the late Dr. Stoliczka ; 

 the specimens are from the Shevroys. The operculum externally presents 

 a curious analogy to that of some species of Turbo ; it is convex, testace- 

 ous, smooth, with only a very small and inconspicuous " umbo," or opening, 

 which is situated considerably above the centre, consequently near the top 

 of the aperture. 



Cyathopoma (Jerdonia) beddomeanum, Nevill. 



Beddome, Proc. Zool. Soc. 1875, as Cyathopoma (Jerdonia) blanfordi, Tinnevelly 

 Mns. at 4000 ft., not Cya. blanfordi, H. Adams, P. Zool. S. 1868, Seychelles. 



Pterocycltjs cyclophoroideus, n. sp. 



This is a form that has hitherto been confused with Pt. nanus, Benson, 

 the shell is more depressed and of thicker substance, resembling more 

 closely Cyclophorus stenosloma, Sowerby, both in form and colouration ; it 

 can be distinguished at a glance by the apparently constant absence of the 

 conspicuous band at the periphery ; I intended, despite all the above, to 

 have merely separated it as a subspecies, when I noticed that all my Ana- 

 mullay specimens have a much raised, concave operculum, whilst on the 

 other hand in my single operculated specimen of Pt. nanus it is only slightly 

 raised, scarcely concave, &c. The Museum is indebted to Colonel Beddome 

 for three operculated specimens from the Anamullays, one of which I take 

 as my type form. 



Alt. 8|, diam. 16 mil. 



