76 ]>ROCEEDINGS OF THK MALACOLOGICAL SOCIETY. 



Mtiny examples were obtained of tliis small Cohimhelht, of tlie same 

 alliance as C. selaspJiora, phaula, M. & S., atorneUa, Duclos, etc., but 

 difPering in greater smoothness, even minuter size, pyriform shape, 

 much attenuated at either extremity, and exceedingly narrow orifice. 

 It is perhaps nearest to C. troglodytes, Souv., but that species is slightly 

 larger, say long. 4, and not quite so narrowed at either extremity. 

 Nassa (xIlectryon) jactabunda/ n.sp. PI. Vll, Fig. 17. 



N. testa obeso-pyramidali, paullum inflata, pallide strammea, versus 

 apiceui rapide attenuata, anfractibus 9, quorum 2 apicales Iseves, 

 teitio sub lente loevi, unicarinato, cseteris ad suturas paullum gradatis, 

 arete longitudinaliter costulatis, costis interdum irregularibus, numero 

 costarum ultimum ad anfractum circa 19, spiraliter undique arctissime 

 liratis, lirarum ordinibus duobus superne, infra suturas, magnis, 

 tumidis, ad costas genimulatis, interdum hie illic paucimaculatis, 

 maculis brunneo-cinereis, apertura ovata, alba, labro effuso, albo, 

 crassiusculo, nitido, intus perindistincte denticulato, columella nitida, 

 alba, excavata, adbasim truneatula, canali brevi. Long. 18, lat. 10 mm. 



Hab. — Persian Gulf. 



To N. idijllia, M. & S.,^ from the Gulf of Oman, this bears a certain 

 resemblance, but is more than half as large again, and a less delicately 

 sculptured species, with spire more acute and lip less thickened. 

 I am indebted to Mr. G. B. Sowerby, not only for the specimens, but 

 for his critical opinion on its merits as a species. 



Makginella (Volvaria) amydrozona,^ n.sp. PI. VIII, Fig. 18. 



M. testa cylindrica, attenuata, nitidissima, polita, subdiaphana, 

 pallide stramineo-fusca, vel, rarius, albo-viridescente, spira omnino 

 callose immersa, ultimo anfractu supra medium indistinctissime 

 spiraliter nnizonato, zona castanea, apertura angusta, intus straminea, 

 labro fere recto, ad medium inflexo, columella triplicata. Long. 8, 

 lat. 2'5 mm. 



Etth.—Verdixw Gulf, Gulf of Oman, Maskat, 15 fathoms (1901-2). 



A nai-row, cylindrical, bulloid species of Volvaria, shining, pale, 

 either straw-coloured, fulvous, or, more rarely, greenish white. The 

 outer lip and columella are callously reflected to such a degree over 

 the spire that total immersion is the result, otherwise the lip is 

 straight, somewhat inflected over the aperture towards the centre, 

 receding again when nearing the base, the columella being white, 

 shining, thrice plaited. 'J'here is a very obscure rufous or chestnut 

 zone slightly above the centre of the body-whorl, extending spirally 

 around it. 



Marginella (Volvaria) eumorpha,^ n.sp. PL VIII, Fig. 19. 



M. testa nitidissima, laevigata, polita, oblongo-cylindrica, albida vel 

 pallide stramineo-brunnea, subpellucida anfractibus 5, quorum apicales 



Jactdliiiiidiis, 'storm-tossed,' from the wave-like costre. 

 Proc. Zool. 8oc., 1901, vol. ii, pp. 410, 411, pi. xxiii, fig. 12. 

 oiyuuSpo's, ^divT), from the indistinct central baud. 

 (vnoiKpus, 'beautifully formed.' 



