1871.] G. and H. Nevill — Descriptions of new Mollmca. 9 



from tho Nicobars, indeed so much so, that some specimens are 

 barely distinguishable, the minute spiral sculpture of the latter 

 being almost the only constant difference. Abundant at the 

 Seychelles, on the ground amongst decaying leaves, &c. 



Nueula Rabaniana, n. sp., PL I. Fig. 11, 11a, lib, lie. 



T. parvula, perobliqua, valde insequilateris, crassa, moderate 

 innata, nitida, pallidula, radiatim obsolete confertim lineolata et 

 concentrice striata, striis distantibus, sub-obsoletis ; parte antica 

 valde et angustatim producta, postica brevi et abrupte truncata ; 

 margine supero, aut dorsali, utriusque valvse eleganter et crasse 

 granulato ; margine interno valvarum minute crenulato ; cardo 

 dentibus validis antice 23, postice 7, instructus, fovea ligamentali 

 angustissima separatis. Length 6, breadth 4%, thickness 3 m.m. 



In shape somewhat resembling JV. Paijtensis, A. Ad., (var. of 

 N. crenulala, A. Ad., apud Hanley), the posterior extremity a trifle 

 more produced, the sculpture is, however, very different. 



The concentric grooves in the present species are very indistinct, 

 often becoming altogether obsolete, there are only traces of radiat- 

 ing striation ; the striking feature, however, is the two peculiar 

 rows of oblique granules (nine in each row) on the anterior dorsal 

 margins ; the inner margins are unusually strongly crenulated ; the 

 teeth very long and sharp, especially the seven posterior ones. 



Pooree, Bay of Bengal, (Raban). Dr. Stoliczka dredged near 

 Penang in 4 fathoms a few specimens of what appears to be this 

 species. They are a little more elongated than those from Pooree. 



Pisidium Clarkeanum, n. sp., PI. I. Fig. 4,4a. 4d. 



T. ventricosa, oblonga, valide inEequilateris, pallide fulva ; 

 postice elongata ac rotundata, antice rotundate truncata ; umboni- 

 bus prominentibus ac tumidis ; superficie concentrice confertim 

 striata, striis tenuibus, regularibus. 



Length 5£, breadth from the umbones 4^, thickness 8J m.m. 



I am indebted for this species to my friend Mr. G. E. Clarke ; 

 it is tolerably abundant in tanks &c, close to the Damuda at Mois- 

 raka. I have lately received a very similar shell from Chittagong, 

 only differing by its smaller size, less produced posterior end and 

 less tumid umbones ; it may prove to be specifically distinct. I have 



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