TROCHUS. 65 



T. UNDATUS Lamarck. PI. 40, figs. 1, 2. 



Shell large, depressed conoid, excavated, false-unibilicate in the 

 center beneath, cinereous or rose colored, radiately striped with 

 brown or black, the stripes sometimes broken into irregular macula- 

 tions, especially on the base ; whorls about 6, convex around the 

 upper part, then flattened, obtusely angulate at the perijihery, the 

 base flattened, concave toward the center ; sutures subcanaliculate ; 

 apex acute, eroded ; following whorls finely granose in spiral series, 

 of which there are 10 to 12 on each whorl ; last whorl somewhat 

 deflected anteriorly, bearing about 30 spiral granose ridges, very 

 close and fine upon and below the peripheiy, coarser above and 

 around the umbilicus, the interstices obliquely striate ; aperture 

 oblique, tetragonal, outer and basal lips thickened and plicate 

 within ; columella oblique, inserted nearly in the bottom of the 

 broad umbilical excavation, its edge reflexed and bearing about 10 

 denticles, twisted near the insertion, terminating below in a simple 

 tooth ; parietal tract wrinkled ; umbilicus with a plicate border, and 

 in the middle a strong, sometimes crenulate, spiral funicle. 



Alt. 18-22, diam. 28-e35 mill. 



S. Australia; Tasmania. 



T. undatus Lam. An. sans. Vert, vii, p. 28, no. 61 (1822). — 

 Fischer, Coq. Viv., p. 168, t. 56, f. 2. — Philippi Conchy L Cab., t. 

 33, f. 4. — Monodonta tmdata Lam. Encyc. Mcth., t. 447, f. 3. — 

 Trochus smithii Wood, Ind. Test., Suppl. t. 5, f. 20a. 



The largest and one of the most beautiful sjDecies of Clanculus. 

 It is apparently more nearly allied to T. maugeri than to any other 

 species of the genus. 

 T. pusiLLus H. Adams. PL 43, fig. 6. 



Shell trochiform, solic, encircled by granose lirje, alternately 

 minute, the interstices densely obliquely striate; rosy, marked with 

 white maculitions; suture canaliculate; whorls 6, convex ; the last 

 convex beneath, with granose concentric lirse ; umbilicus crenulated, 

 white; aperture diagonal, subcircular; columellar tooth prominent, 

 compressed ; lip simple, sulcate within. {Adams.) 



Alt. 5, diam. 7 mill. 



Nexv Hebrides. 



Clanculus pusillns H. Ad., P. Z. S., 1873, p. 207, t. 23, f. 9. 



T. CLANGULOIDES Wood. PL 10, figS. 10, 11. 



Shell globose-conic, very solid, deeply, narrowly false-umbilicate, 

 fawn colored, lighter beneath and roseate at the apex, sharply 



