338 CALLIOSTOMA. 



on the base, acutely angled at the periphery. Pillar is broken in 

 front, but seems short ; it is encompassed with a pad of nacre and 

 has a twist on it ; there is no approach to an umbilicus. 

 Alt. 1, diam. 0*95 inch. (Watson.) 



Philippines, in 102 fms. 



Trochus {Zizlphmits) stephanephorus Watson, Challenger Rep. 

 Gasterop., p. 58, t. 17, f. 1. 



In general character this is like Trochus meyeri Phil, but that 

 shell is in color brown, and the stains are arranged in narrow 

 divergent lines, not, as here, in ruddy stains affecting especially 

 the tips of the tubercles. In that species, the whole whorl swells 

 out below the suture, not, as here, the mere thread, nor in that 

 species are the tubercles there any larger than elsewhere. The 

 threads on the sides are fewer, and their tubercles are larger ; on 

 the base the threads are much coarser and more strongly tubercled ; 

 the entire apex is dark colored, and is smaller and smoother. 

 ( Watson.) 



C. TRANQUEBARicuM Pfciffcr. PI. 17, figs. 17, 18. 



Shell conical, imperforate, solid, very pale colored, almost white, 

 minutely tessellated on the ribs with light brown, the periphery 

 with larger spots of the same. Surface finely spirally striate, the 

 stride about 8 on the last whorl, with a couple of stronger ribs at the 

 periphery, which are visible above the suture on the spire whorls. 

 Spire short, conic, acute, its lateral outlines rectilinear ; whorls 7-8, 

 flat, the last acutely carinated, flat beneath ; aperture oblique, 

 rhomboidal, smooth and nacreous within ; columella short, arcuate, 

 obliquely truncate at base. 



Alt. 14, diam. 18 ; alt. 13, diam. 19 mill 



Northern shores of the Indian Ocean; Tranquehar ; Ponchlderry ; 

 Vizagapatam. 



Tr. tranquebaricus L. Pfeiffee, Krit. Regist. zu Mar. Conch. 

 Cab., p. viii, no. 5. — Philippi, Conchyl. Cab., p. 65, t. 13, f 10. — 

 Fischer Coq. Viv., p. 308, t. 98, f. 1. — Ziziphimis tranquebaricus 

 Chemn., Rve., Conch. Icon., f 15. 



Easily known by the low-conical form, finely sculptured flat 

 whorls, edged at periphery and sutures by a pair of strong lirse. 



C. ciLiARis Menke. PI 67, figs. 40, 41. 



Shell pyramidal, imperforate, fulvous, with red sjiots along the sut- 

 ure, transversely striate, decussated by very delicate strise ; base plane; 



