446 EUCHELUS. 



the third forming a carina ; sometimes with a delicate riblet between 

 the 3d and 4th lirse ; last whorl subrotund, with unequal, alternating 

 cinguli ; base convex, with 5-6 concentric beaded cinguli ; interstices 

 clathrate ; aperture subovate, sulcate inside ; lip thick, duplicate ; 

 basal margin plicate-dentate, and deeply notched ; columellar callous 

 a little reflexed above, passing into the right margin. 



Alt. 4, diam. 4 mill. (Fischer.) 



Port Jackson ; New South Wales, Australia. 



Euchelus scabriusculus A. Ad. and Ang., (MS. in Coll. Cum.) P. 

 Z. S. 1867, p. 215 (no description). — Trochus scabriuscuhis Adams, 

 Fischer, Coq. Viv., p. 374, 1. 114, f. 2. 



Operculum multispiral, as in most genera of Trochidiie not few- 

 whorled as is the case with Euchelus. 



Subgenus Tallorbis G. and H. Nevill. 



Tallorhis Nevill, Journ. Asiat. Soc. Bengal xxxviii, p. 159, pt. 

 i, 1869. 



I am in doubt about the systematic position of this group. Nevills 

 compare it to Thalotia. Fischer considers it a section under 

 Euchelus. The original description is as follows : Shell suborbicu- 

 late, subcouic; columella solid, anteriorly applanate, transversely 

 plicate and abruptly terminated. 



E. ROSEOLA Nevill. PI. 57, fig. 15. 



Shell depressed-conical ; whorls 5, rapidly widening, separated by 

 profound sutures, spirally distantly costulate, costulse 3 on penulti- 

 mate whorl, separated, elegantly ornamented with numerous rosy 

 tubercles, the interstices wide, divided by a central spiral thread, 

 transversely cancellated ; base convex, similarly ornamented ; aper- 

 ture ample, subrotund, pearly, smooth inside in adult specimens, in 

 young ones sulcate ; lip scarcely thickened, crenulate at the margin ; 

 labium thin ; columella thickened anteriorly, subreflexed, with three 

 twisted plicse. Alt. 11 A, diam. 11 mill. (Nevill.) 



Southern Province of Ceylon. 



Tallorhis roseola G. and H. Nevill, Journ. Asiat. Soc. Bengal, 

 xxxviii, pt. i, p. 160, t. 17, f. 5, 1865. 



The Jolhnving species of A. Adams' may be regarded as unidentifi- 

 able and practically non-existant. 



MoNODONTA suLCiFERA A. Adams. Testa globoso-conica, um- 

 bilicata, fusca, cingulis granorum distantium moniliformibus, inter- 



