1882.] 0. F. von MoUendorff— Ow Clausilia Nevilliana. 11 



II. — Clausilia Nevilliana, a new species from the Nicohars. 



By 0. F. VON MoLLENDOEFF, Ph. D. 

 (Received January 15th. ; — Read April 5th, 1882.) 



Clausilia nevilliana, n. sp., PI. I, Fig. 11. 



Testa elongato fusiformis, suhtiliter oblique striatula,fusca^ nitidula ; 

 anfr. 10 convexiuscidi, apertura mediocris,fere verticalis, elongato •'pirifor- 

 mis^ sinulo recto perlongo, peristoma continuum, solutum, tenue, hrevissime 

 expansum, superne profunde sinuatum fere angulatum. Lamella supera 

 ohliqua, marginalis, valida, cum lamella spirali continua, infera a supera 

 valde remota, spiraliter recedens, hrevissime confipicua. Blica principalis 

 Tonga, palatales duae majores prof undae, ventrales, (antice intuenti supra 

 aperturam conspicuae), lunella nulla. Clausilium ? {non vidi.) 



Alt. 20, lat. 4, apert. long. 4, lat. 3 millim. 



Hab. This very fine novelty was discovered by Mr. de Koepstorff on 

 the island of Camorta, Nicobars, under a fallen tree in a damp place. 



The small number of specimens — I have seen but two — has prevented 

 as yet the examination of the inner structure of this interesting new 

 Clausilia. This is the more to be regretted as it does not seem to 

 belong to the same group as the only other species of the genus hitherto 

 recorded from the Nicobars, CI. wiillerstorffi, Zeleb. This species (of which 

 I have seen one specimen in Brigade Surgeon Hungerford's collection) is nearly 

 YQ\2itedi to CI. java7ia, Pfr., and should find its place in Bottger's second 

 section of Fhaedusa {Fseudonenia) and therein in the 5th subgroup ('* For- 

 menkreis") of CI. javana. Oar Clausilia nevilliana has nothing of the 

 Nenia-like shape of that group, effected by the small number of whorls, 

 the very large aperture, which is more or less protracted below. It is on 

 the contrary rather slender, the aperture is rather small and though not 

 very oblique still not quite vertical. The closing apparatus agrees pretty 

 well with the characters given by Bottger of his section Acropliaedusa 

 (Clausilienstudien, p. 64), mz., a very long " principal plait," two or three 

 rather long and deep palatal plaits, no lunella, small parietal lamellae, piri- 

 form aperture, not dilatate peristome. This group was created for two 

 Javanese species, CI. cornea and junghuhm, Phil., and includes the Indian 

 forms CI. monticola, Godw.-Aust., and aracana, Theob. Unless the break- 

 ing up of a specimen should necessitate a different classification, I think 

 that Clausilia nevilliana can more safely be considered to be an Acrophae- 

 dusa. 



