TROCHUS. 19 



102,— r. alius Phil. Conch. Cab. ii, p. 217, t. 32, f. 7.— T. senatorius 

 Phil, Conch. Cab. ii, p. 324, t. 46, f. 7. 



The T. altits of Philippi is doubtfully placed here. It has more 

 acutely carinated periphery than any actangulus I have seen. I 

 have copied Philippi's figure on PI. 9, fig. 96. This species is the 

 type of Gray's group Rochia. 



Subgenus Cardinalia, Gray, 1840. 



T. viRGATUS Gmelin. PI. 5, figs. 43, 44. 



Shell imperforate, conic-pyramidal, solid, white, above longitudi- 

 nally broadly flammulated with red ; spire somewhat attenuated 

 and concave on its up])er portion, then slightly convex, the sutures 

 linear, whorls nearly planulate, apex acute ; sculpture of spire con- 

 sisting of spiral prominently beaded lirse, about eight on each whorl; 

 whorls 10, the last carinated at the periphery; base plano-concave, 

 indented in the center, finely, densely lirate, the line minutely beaded, 

 red, articulated with Avhite, the interstitial furrows white ; aperture 

 subrhomboidal, denticulate within the base ; columella short, oblique, 

 ending in a tubercle below, simply entering, not plicate, above, 



Alt. 45, diam. 40 mill. 



Indian 0.; Red Sea. 



T. virgahis Gmel., Syst. Nat, xiii, p. 3580. — Philippi, Conchyl. 

 Cab., p. 4, t. 1, f 4, 5. — Reeve, Conch. Icon., f 69. — Fischer, Coq. 

 Vlv., p. 97, t. 27, f 1; t. 28, f 1. 



The plano-concave finely lirate base, simple columella and tooth- 

 less aperture at once separate this species from other Trochids. 



Subgenus Tectus Montfort, 1810. 



Teetus Mojjtf., Conch. Syst. i, p. 187. — Pyramis Schumacher, 

 Essai d'un nouv. Syst. Vers test., p. 232, (1817.) 



T. obeliscus Gmelin. PI. 2, figs. 13, 14. 



Shell imperforate, solid, thick, strictly conical, the spire more or 

 less attenuated above, the apex acute; color yellowish or grayish, 

 more or less mottled and marbled with green or brown, base white, 

 green or brown ; whorls 12-14, the upper ones slightly exserted and 

 plicate, tuberculate or undulating at the sutures, the folds or tuber- 

 cles obsolete on the lower whorls; upper whorls encircled with one 

 or two spiral series of small tubercles or beads, which are increased 

 to about five series on the middle whorls ; last whorl beaded, but 

 smoother than the preceding, or radiatel^ finely wripkled, or nearly 



