TROCHUS. 53 



granose-lirate, the lirse 10 to 12, much finer than those of the upper 

 surface ; aperture subtetragonal, oblique, outer lip lirate within, 

 slightly plicate-tuberculate near its upper angle ; basal lip rounded, 

 expanded, denticulate ; columella oblique, a little convex, ending 

 below in a square centrally sulcate tooth, its front margin reflexed 

 and finely denticulate, inserted above upon the side of the umbilicus ; 

 umbilicus wide, funnel-shaped, smooth within, margined by a smooth 

 rib. Alt. 10, diam. 14 mill. 



Port Jackson, Sydney, Australia. 



Clanculus omalomphalus A. AD., P. Z. S. 1851, p. 162. Trochus 

 homalomphalns FISCHER, Coq. Viv. p. 235, t. 81. f. 2. WATSON, 

 Challenger Gasteropoda, p. 51. 



Like the preceding species in coloration, form of spire, base and 

 aperture ; but more finely granose both above and below, the umbili- 

 cus wider, its margin smooth. C. omalomphalus is more acutely 

 carinated than the next species. 



T. FLOBIDUS Philippi. PL 10, figs. 12, 12a. pi. 14, figs. 12, 13. 



Shell low conical, subcarinate at the periphery, the carina evanes- 

 cent toward the termination of the last whorl, deeply umbilicate ; 

 color light brown or grayish, striped with rich brown, the markings 

 somewhat interrupted around the middle of the upper surface of the 

 last whorl, the stripes more numerous and narrower at the periphery 

 than upon the upper surface, and continued upon the base, or fading 

 out there, and replaced by dots of brown on a light ground ; sutures 

 deeply impressed ; whorls about 5, the apical ones acute, pale pink, 

 the following closely granose-cingulate, the last with about 17 to 21 

 closely beaded cinguli, of which the 8th or 9th usually forms the 

 peripheral angle, all above that being subequal and equally spaced; 

 those of the base are more crowded and finer ; the interstices are 

 sharply, finely obliquely striate ; body whorl deflected toward the 

 aperture, and appearing gibbous ; aperture subhorizontal, subtetra- 

 gonal ; outer lip with a finely plicate thickening or rib within, and 

 a strong tubercle near the upper angle ; basal margin expanded, 

 crenulated, and bearing a small but distinct central, very oblique 

 fold within ; columella very oblique, with a strong biplicate tooth 

 below, a wide triangular projection at the middle, the whole edge 

 reflexed but not distinctly crenulate as in the preceding two species, 

 the insertion upon the side of the rather wide umbilicus, which has 

 a radiately crenulated marginal rib ; parietal wall wrinkled. 

 Alt. 8-9, diam. 11-12 mill. 



Port Jackson, Australia. 



