TROCHUS. 57 



Monodonta ringem Piiilippi, Zeitschr. f. Mah 1846, p. 99. (not 

 M. ringens IVIke, also a species of Clanculas.) — Trochus personatus 

 Phil., Conchyl. Cab. p. 78, t. 14, f. 7. (about 1847.) 



This species is allied to T. anus Phil, but differs in the deeper 

 umbilicus, the smooth, not tuberculate edge of the columella, the 

 stronger development of the teeth, more di.stinct granulation, and 

 other characters. The aperture is almost horizontal ; the umbilicus 

 and aperture are both narrower than in T. anus. The peristome is 

 much thickened inside. 



T. ocHROLEUcus Philippi. PI. 13, figs. 95, 96. 



Shell conoidal, umbilicate, isabella-colored, sculptured with very 

 fine subgranose line, about 11 on j^enultimate, 40 on last whorl; 

 whorls rather convex, the last scarcely angled ; margin of the 

 umbilicus dentate ; columella very oblique, not solute above, ter- 

 minating below in a simple denticle ; lip thickened and corrugated 

 within. 



The form is just like T. vieilloti Payr. ; the shell consists of 6 to 

 7 rather rounded whorls, the last one not angulated to speak of, and 

 with a rather convex base. The spiral cinguli gradually increase in 

 number, so that on the penultimate there are about 11, on the last 

 whorl about 40 of them. On the upper whorls they are distinctly 

 granulose, on the last almost entirely smooth. The umbilicus is 

 pretty narrow, its margin dentate ; the columella is very oblique, 

 not free above, with a small but prominent denticle below ; the out- 

 er lip is thickened within, with five folds, but near the edge with 

 numerous wrinkles. The color is isabella-yellow. 



Alt. 8, diam. 12 mill. (Philippi.) 



Habitat unknown. 



Trochus ochroleucus Philippi, Conchyl. Cab. ji. 243, t. 36, f. 16. 

 .(after 1853.) 



T. CLANGULUS Wood. PI. 10, figs. 5-7. 



Shell conical, with decidedly higher spire generally than C. flor- 

 idus, subcarinate, nearly rounded at the periphery, very deeply 

 umbilicated ; color brownish, or, more frequently a beautiful emer- 

 ald green, much ])aler below, the upper surftvce broadly radiately 

 maculate with crimson, the flames not extending below the periphery, 

 which, with the base, is dotted with the same shade ; spire usually 

 attenuated toward the acute rose-colored apex ; whorls about 6, con- 

 vex, the last deflected anteriorly, spirally sculptured with about 18 



