30 TROCHUS. 



T. CALCARATUS Souverbie. PI. 2, fig. 15 ; PI. 8, figs. 83, 84. 



Shell false-umbilicate, elate-conic, solid ; spire with nearly recti- 

 linear outlines ; whorls about 9, planulate, the last carinated ; 

 sculpture of upper surface consisting of spiral series, four or five on 

 each whorl, of regular, closely arranged granules, which are either 

 rounded, bead-like, or laterally compressed ; and upon the periphery 

 of each whorl, a row of radiating, minutely perforated pustules, — 

 numbering on the last whorl 28 ; the base is concentrically sculpt- 

 ured with 6 to 7 concentric, densely granose lirse; it is slightly 

 convex, radiately striped with brown or purplish; color of upper 

 surface, whitish, broadly striped with red, })urplish or brown ; usu- 

 ally blue when rubbed; aperture lirate within on outer and parietal 

 walls; basal margin concave, thick, dentate within; columella 

 oblique, plicate within, quadridentate ; umbilical tract white, bi- 

 plicate. Alt. 32, diam. 28 mill. 



Ins. Art and Duperry, N. Caledonian Archipe/ago ; Phi/ippines. 



T. (Polydonta) calcaratus Souverbie, Journ. de Conch., 1875, p. 

 41, t. 4, f 7.— T. pustulosus Fmh., ZeiUeh. f. Mai. 1849, p.l 88, 

 Conehyl. Cab. p. 305, t. 44, f. 6, (pi. 8, fig. 85).— Reeve Conch. 

 Icon., f. 86.— T. hiHtrio Reeve, P. Z. S., 184<S, p. 52, Co7ich. Icon., 

 18()1, f 90 (pi. 8, fig. 87).—.^ T. cumingn A. Ad. P. Z. S. 1851, p. 

 150. T. cumivgii Reeve, Conch. h:on., f 88. 



This form, like T. tubiferus Iviener, is prinripally distinguished 

 by the fistulous or perforated [)eripheral tubercles. I have some 

 hesitation in referring here as synonyms T. pustulosus Phil., and 

 T. histrio Reeve. The first was described from a very young speci- 

 men ; the latter was not well described, and as was his custom in 

 Trochus, only a back view was given by Reeve, so that positive 

 identification is difficult. For these reasons I adopt the French 

 naturalist's name for the species. 



T. cumingii (Ad.) Reeve (PI. 43, fig. 11,) may be the young of this 

 species, but on account of the slender form I hesitate to place it 

 here. It is at all events a young shell. Specimens which agree 

 exactly with Reeve's figure are before me. They exhibit about 7 

 planulate whorls, the sculpture of which consists of about five or six 

 spiral granulose lirte on each whorl ; the lower third or half of each 

 whorl is strongly plicate, each fold terminating in a solid tubercle 

 at the periphery ; of these tubercles there are 18 on the last whorl ; 

 the base is flat, somewhat concave, 6 to 7 lirate ; outer lip lirate 

 within; basal lip and columella thin, without teeth, as is usual in 



