1881.] Mollusca of the huh- Malayan Fauna. 1-10 



Cataulus TOBTUOSTTS, Chemnitz. 

 Conch. -Cal). I, Vol. XI, 1795, figs. 1882-3, "Nieobar Islands," as Turbo tortuoms. 

 Mr. Benson long ago expressed his belief that this most remarkable 

 form would prove to be a native of South India and not of the Nicobars. 

 If this were the case, it could scarcely have escaped the researches of so 

 indefatigable a naturalist as Colonel Beddome ; nor has it — the Colonel 

 having lately found a single specimen on the Hills N. E. of Trevandrum at 

 2500 feet, which he has most generously presented to the Indian Museum ; 

 the apical portion is unfortunately broken away, but the remainder agrees 

 well with the somewhat crude original figure and the much better ones of 

 Sowerby in the Thesaurus and Con. Indica. 



Alycaeus montanus, n. sp. PL VI, Fig. 5. 



Openly and widely umbilicate, much depressed, solid, bright corneous 

 brown, closely, evenly and regularly ribbed, ribs somewhat superficial, scarcely 

 flexuous, close-set, for a short distance at the sutural tube more crowded 

 and more strongly developed ; spire scarcely elevate, apex obtuse ; whorls 

 4, regularly evenly rounded, constriction scarcely defined, sutural tube 

 short (about 1 mil.) ; aperture circular, peristome slightly thickened, but not 

 double ; operculum thick, black, and concave. 



Hab.— Sikkim, at 11,000 ft. 



Diam. 5^, alt. 3^- mil. 



A well marked form, reminding one of A. eccpatriatus ; the depressed 

 form, very open umbilicus, and scarcely distinguishable constriction are all 

 good characters. 



Alycaeus hungerfordianus, n. sp. 



Shell depressed, in shape resembling the preceding, but markedly 

 less openly umbilicate ; solid, more or less of a pinkish hue, irregularly 

 spirally striate on the upper two whorls, then distantly ribbed, the ribs 

 becoming gradually more acutely raised, and consequently more prominent, 

 a little more close-set at the sutural tube, the difference not being very 

 noticeable as in the preceding, ribs behind the peristome acute, prominent, 

 distant ; spire scarcely elevate, apex obtuse, peculiarly, abruptly and pro- 

 minently raised, slightly twisted ; whorls 4 (or 4£ ?), compressedly convex, 

 having a slightly subangulate appearance at base, where the sculpture 

 is as well defined as it is above ; constriction slightly developed, rather 

 produced, much as in A. stoliczkii, sutural tube short as in the preceding ; 

 aperture circular, peristome remarkably thickened, generally distinctly 

 triple, but sometimes only double, forming a slight projection over the 

 umbilical area. 



Diam. 4, alt. 2 mil. 

 20 



