54 TROCHUS. 



Trochus fioridus F111L.IFFI, Conchyl. Cab. p. 243, t. 36, f. 15. — 

 Zeitschr.f. Mai. 1849, p. 156. — Wathon, Challenger Gasteroj). p. 52. 

 — Clanculus gibbosus A. Ad. P. Z. S. 1851, p. 162. — Fischer, Coq. 

 Viv. p. 237, t. 81, f. 3. 



This form may be distinguished from the preceding by the nearly 

 round periphery ; the outer lip is much depressed and straightened, 

 producing a very oblique aperture ; the sutures are profoundly 

 impressed ; the granulose cinguli of the upper surface are equal, 

 and separated by sharply crispate interstices. 



T. ANUS Philippi. PI. 14, figs. 34-36 ; pi. 11, figs. 43-45. 



Shell low-conic, solid, subangulate at periphery, with a rather 

 wide umbilical excavation, whitish, maculated with brown below 

 the sutures, the remainder of the shell tessellated, black and white, 

 pinkish or yellowish toward the apex ; whorls 5 to 6, somewhat con- 

 vex, spirally gran ose-1 irate, the lirse 5 or 6 on the penultimate, 12 or 

 13 on the last whorl, of which the 6th is at the periphery ; the fine- 

 ly beaded lirse are separated by minutely spirally and obliquely 

 striated interstices as wide as the ridges ; the body-whorl is a little 

 deflected anteriorly, flattened and excavated in the center beneath; 

 the aperture is contracted, very oblique, tetragonal ; the upper lip is 

 straight, with a strong tooth midway between its insertion and the 

 outer angle of the aperture ; the outer and basal lips are well curved, 

 thickened and plicate-denticulate within ; the columella is very 

 oblique, its edge reflexed and bearing 4 or 5 large tubercles, one at 

 its insertion; terminating below in a strong quadrangular bifid tooth ; 

 parietal tract bearing strong white wrinkles ; umbilical excavation 

 penetrating but little deeper than the insertion of the columella, its 

 border plicate-denticulate. Alt. 9-11, diam. 12-15 mill. 



Australia. 



Trochus anus Phil., Zeitschr.f. Mai., 1848, p. 101. — Conchyl. Cab. 

 p. 266, t. 39, f. 7.— Fischer, Coq. Viv. p. 324, t. 101, f. 3. 



This species is allied to T. floridus, etc, but differs in the shallow 

 umbilicus, very heavy columellar teeth and coarser sculpture. In the 

 form of the aperture anus is very similar to floridus ; like that species, 

 it is nearly horizontal, and obstructed by large teeth. T. limbatus 

 is more strictly conical, with less developed teeth than anus, and has 

 a more deeply perforating umbilicus. T. clanguloides, with equally 

 strongly developed teeth, is far more finely sculptured, and has a 

 deeply entering columella. 



