﻿1874.] G. and H. Nevill— 0?i Mw Marine llollusca. 27 



Trochus [Solariella] castus, n. sp., PI. I. Fig. 4. 



Shell conoidal, glabrous ; white, ornamented with brown, sometimes 

 in distant broad flames, sometimes in minute close reticulations, base white, 

 on the outer half only, streaked or marbled with brown ; whorls five to six, 

 angular, spirally keeled, keels prominent, four to five ; outer half of the 

 base with five, distant, impressed spiral lines ; round, and entering into, 

 the open, deep umbilicus some six spiral rows of close oblique granules, the 

 outer row of which is the largest. 



Alt. 7i Mil., Diam. 9 Mil. 



Ceylon. (Coll. H. Nevill and Indian Museum.) 



Teochus [Clancultjs] Tonneerei, n. sp., PI. I, Fig. 3. 



Shell small, turbinated, similar in shape to our C. Ceylonicus, J. A. S* 

 for 1869, p. 157, (? = de'gictus, A. Ad.) ; white, above marked with broad 

 flames of chesnut-brown, on the base closely mottled with the same colour ; 

 ■whorls five, convex, with four rows of spiral, coarsely granulated keels on 

 each whorl, last whorl at the periphery almost rounded, with two rows of 

 the spiral keels more strongly developed than the rest ; interior of the aper- 

 ture striated, forming a slight denticulation at the outer margin ; base slightly 

 convex, with nine rows of granulated keels, margin of the umbilicus 

 thickened and rather indistinctly twisted or denticulated, somewhat as in 

 C. seabrosus, Phil., in this respect differing essentially from C. Ceylonicus 

 and most others of the sub-genus ; it is somewhat allied to G. Kraussii, Phil. 

 I have named this shell in honour of Dr. Fabre Tonnerre, who some years 

 ago presented to the Asiatic Society of Bengal a valuable collection of 

 birds, shells, &c. 



Alt. 6 Mil., Diam. 7 Mil. 



Aden. 



Trochus [Monilea] Waris^efordi, n. sp., PI. I. Fig. 2. 



Shell flatly conoidal ; whorls six, angular, spirally ribbed with rather 

 distant, slightly undulating costulations^ keeled at the periphery ; on the 

 angle of the last whorl, a row of slightly raised transverse undulations, 

 giving the shell a coronated appearance ; brown, irregularly and minutely 

 reticulated with white ; base smooth, glabrous, closely ribbed, ribs somewhat 

 superficial, flat, with a smooth thickened callosity round the umbilicus, 

 forming a tooth on the margin of the columella ; interior of the aperture 

 barely striated. The only species at all resembling this fine shell are Moni- 

 lea rigata, Phil., M. callifera, Lam. (also found in our Indian Seas) 

 and our M. Masoni; it can, however, be easily distinguished from all 

 of them by the above characters. 



Alt. 9i Mil., Diam. 13^ Mil. 



Andamans. Rare. 



