TROCHUS. 21 



aperture transverse, rather wide, rhomboidal, the basal margin reg- 

 ularly curved, 6 to 8 plicate within near the columellar termination; 

 columella very short, the fold stout, heavy, directed downward. 

 Alt. 80, diam. 70, mill. Red Sea; Persian Gulf. 



Trochus dentatus Forskal, Descr. Animallmn, p. 125, 1775. — T. 

 pyramidalis Lamarck, An. sans Vert., vii, 1822, p. 17. — T. foveola- 

 tus Gmelin, Syst. Nat. xiii, p. 3580. 

 T. TRiSERiALis Lamarck. PI. 4, fig. 30 ; pi. 3, fig. 20. 



Shell turreted-couic, imperfiarate, solid, heavy, flesh-colored, light- 

 er beneath ; whorls about 12, somewhat convex toward the lower, 

 concave toward the upper part, the u})per whorls with a single sub- 

 median series of rather prominent tubercles, the lower with about 

 four subequal series of small, separated, rather acute tubercles, the 

 surface between them minutely wrinkled; base nearly flat, spirally 

 Urate, the lirte becoming narrow toward the outer edge ; aperture 

 rhomboidal, outer and parietal walls more or less lirate within, base 

 with a deep seated spiral fold near the columella within ; columella 

 strongly, acutely folded, the fold directed downward. 



Alt. 45-50, diam. 36-40 mill. Philij)pines. 



T. triserialis Lam., An. sans Vert., vii, p. 22, 1822. — T. aeutus 

 Rve., Conch. Icon., sp. 20, (non T. aeutus Lam.) (pi. 3, fig. 20.) 

 T. FABREi Montrouzier. Pi. 3, figs. 21, 22. 



Shell imperforate, conic-pyramidal, whitish, with a fulvous epider- 

 mis mottled with roseate ; whorls about 14, subplauulate, separated 

 by linear, flexuous sutures, obliquely striate, sometimes nodulose 

 above the sutures, with spiral granulose lira3, on the upper whorls 

 three, on the lower four to six in number; last whorl carinated, 

 margined at the suture ; base planulate, concentrically lirate, the 

 liraj flat, about 15 in number, the interstices radiately striate ; aper- 

 ture transverse, rhomboidal, the basal margin plicate within ; col- 

 umella short, strongly spirally plicate truncate. 



Alt. 50, diam. 37 mill. (Fischer.) 



Lifou, Loyalty Archipelago ; Quaternary of the Isle of Pines, New 

 Caledonian Archipelago. 



T.fabrei Montrouzier, Journ de Conch., xxvi, 1878, p. 64, 206. — 

 Fischer, Coq. Vivantes, p. 384, t. 116, f. 1, la. 



Nearly allied to the T. triserialis, but differing in the sculpture, 

 which consists of granulose lirse, instead of series of independent 

 pustules. The larger figure is from a fossil example from the Isle 

 of Pines. 



