Mollusca. 59^ 



Hah. — Found on mossy trunks of trees in the upper part of the 

 island (J. J. Lister) ; north coast (Andrews). 



The tyiic of Z. mouhoti was described from Camboja, and differs 

 slightly in being a trifle more elevated than the specimens from 

 Christmas Island. Its peristome also is slightly broader. At 

 present i have seen only two specimens, so am unable to judge 

 of the constancy of these differences. 



Family TRUXCATELLID^. 



13. Truncatella valida, Pfeiffer. (PI. VIII, Figs. 21, 22.) 



Truncatella valida, PfeifFer, Mon. Auric, p. 184; Iviister, Couch. -Cab., p. 11, 

 pi. ii, ti.ys. 19-21, 23. 



Hab. — Philippine Islands, New Caledonia, Samoa, etc. 



The two or three apical volutions, constituting the protoconch, 

 are very convex, and although apparently smooth under a simple 

 lens, under the microscope are seen to be very finely, regularly, 

 longitudinally striated. 



Family ASSIMINEID^. 



14 Assiminea andrewsiana, n.sp. (PI. VIII, Fig. 23.) 



■ Testa elongata, conica, imperforata, rufescenti - coi'uea, vix 

 pellucida; anfractus 7, convexiusculi, lente accrescentes, infra 

 suturam linea pellucida marginati, la^ves, nitentes, ultimus brcvis, 

 rotundatus ; apertura obliqua, inverse auriformis, longit. totius 

 -g- fere ada?quans ; peristoma marginibus callo tenui junctis, externo 

 acuto, tenue, columellari valde incrassato et reflexo. Long. 4, 

 diam. 2^ mm. 



Only a single specimen was obtained of this pretty little species. 

 It is closely allied to A. ivoodmasoniana, I^evill,^ from Port Canning, 

 near Calcutta. It is similar in colour, but has more convex 

 whorls, and wants the keel which surrounds the umbilical region, 

 also a fine thread-like line which winds up the spire round the 

 middle of the whorls. This character, present in all four specimens 

 of A. tvoodmasoniana obtained by the Museum from Dr. Hungerford's 

 collection, is not noticed in Mr. i!s^eviirs description. 



1 Journ. As. Soc. Bengal, 1880, vol. xlix, pt. 2, p. 163 ; 1881, vol. l, p. l-'iS,. 

 pi. vii, fig. 1. 



