310 TROCillD^. 



point anteriorly. 2 sp. Indo-Pacific. T. NiloHcus, Linn. 

 (Ixxx, 39). 



ROCHiA, Gray. Shell with a strong fold on the pillar-lip, and 

 a deep sinus behind, near the whorl. T. acutangulus^ Chemn. 

 Philippines, Australia. 



CARDiNALiA, Gray. Conical, whorls flattened, granulated, the 

 the last angular, not umbilicated ; columella simple above, a little 

 twisted, and terminating in a point below; outer lip slightly 

 toothed basally. T. virgatus, Gmel. (Ixxxi, 40). Indian Ocean, 

 Philippines. 



TECTUS, Montfort. (Pj^ramis, Schum., 1817. Pyramidea, 

 Swains.) Shell conical, not umbilicated ; whorls smooth or 

 tuberculated, the last angular ; aperture wider than long ; colu- 

 mella short, spirally twisted, terminating in a point anteriorly. 

 9 sp. Red Sea, Indo-Pacific. T. triserialis, Lam. (Ixxxi, 41). 



POLYDONTA, Schum., 1817. (Lamprostoma, Swains.) Shell 

 conical, not umbilicated ; whorls mostly granular, the last angu- 

 lated ; aperture subrhomboidal ; columella spirally twisted, rib- 

 like and plicate, forming a false umbilicus ; base of aperture 

 rib-like and dentated, joining the columellar dentitions. 17 sp. 

 Indo-Pacific, Polynesia. T. maculatus, Linn. (Ixxxi, 42). 



PR^ciA, Gray. Shell with the pillar-lip twisted, simple ; axial 

 cavity deep, narrow, with a distinct, narrow, central, spiral rib. 

 T. elegantulus, Wood, is the only species. 



ANTHORA, Gray. Shell with the pillar-lip twisted, simple ; 

 axial cavity moderate, narrow, with several opaque, subspiral 

 ridges. T. viridis, Gmel. 



BELANGERiA, Fisher. No diagnosis published. T. scabrosus, 

 Phil. (Ixxix. 15). Indian Ocean. 



INPUNDIBULTJM, Montfort. (Carinidea, Swains.) Shell conical ; 

 whorls flattened, the last angular, base concave ; columella 

 without teeth or with the teeth obsolete, 6 sp. Indo-Pacific, 

 Red Sea. T. concavus, Linn. 



OMPHALius,Phil. Shell convex-trochiform, umbilicated ; whorls 

 with revolving series of granules, the last whorl bluntly angu- 

 lated at the periphery ; umbilicus encircled by a callosity ; colu- 

 mellar lip terminated by a tooth anteriorly, below which are 

 small tubercles; outer lip usually internally grooved. 11 sp. 

 East and West tropical America, West Indies. T. viridulus, 

 Gmel. 



ISANDRA, H. and A. Adams. (Eudora, Ad.) Shell polished, 

 subconoidal, whorls rounded ; aperture subquadrangular ; inner 

 lip straight, dentate below, forming an angle at its basal union 

 with the outer lip ; umbilicus open, profound, surrounded with 

 crenulations. Australia and Philippines. T. coronatus, A. Ad. 

 (Ixxix, 16). 



LiVONA, Gra3\ (Cittarium, Phil. Meleagris, Montf.) Shell 



