58 TROCHUS. 



closely granose cinguli, of which 5 to 8 princi2:)al ones are above the 

 periphery, their interstices bearing granose riblets, and sharp oblique 

 stripe ; on old individuals the disparity in the size of the lirse of the 

 upper surface is often scarcely apparent ; the base bears nuich finer, 

 closer, granulose lirse ; aperture very oblique, subtetragonal, outer lip 

 plicate within, the tooth near the superior angle but slightly devel- 

 oped ; other details of aperture and umbilicus as in the T. persona- 

 tus, save that the parietal area is scarcely wrinkled. 



Alt. 12, diam. 13 ; alt. 10, diani. 12| mill. 



Port Jackson, Australia. 



Trochus clangulus Wood, Ind. Test. Suppl. t. 5, f 31. 1828. — 

 Philippi, Conchyl. Cab. t. 36, f 8. — Fischer, Coq. Viv. p. 234, t. 

 81, f 1. 



This form is closely allied to C. floridus ; differing in the lesser 

 development of the superior tooth of the lip, the smoother parietal 

 area, and (typically) the greater altitude. C. floridus, too, has much 

 deeper sutures, rounder whorls, and, especially, the ribs of the upper 

 surface are equal, whilst in C. clangulus they are alternately large 

 and small. 



In the obsolescence of the superior tooth of the aperture, this 

 sj^ecies forms a transition from the preceding to the following 

 group of sj)ecies ; whicli, whilst closely allied to the foregoing, differs 

 in the less developed teeth within the aperture. 



*** 

 T. MiNiATUs Anton. PL 10, figs. 23, 24 ; pi. 14, figs. 24, 25. 



Shell conical, carinated at the periphery, deeply umbilicated, 

 painted with crimson and brown radiating bifurcating stripes above, 

 the apical whorls crimson, the base convex, radiately strigate or fine- 

 ly tessellate with brown ; whorls about 6, suliplanulate, but with a 

 slightly salient central carina above, spirally finely granose-lirate, the 

 lirse narrow, close, about 8 to 12 in number on the upper surface of 

 the last whorl, the 5th forming a slightly projecti;ig carina ; base 

 finely lirate, the liraj granose, about 15, subequal, or sometimes 

 alternately smaller, the interstices radiately striate ; aperture rather 

 large, subrhomboidal, the outer lip lirate within, base crenulate, 

 expanded ; columella long, straight, strongly dentate at base, obsolete- 

 ly folded above, inserted upon the side of the umbilicus, which is 

 smooth within, bordered by a slight, smooth rib. 



Alt. 12J-15, diam. 15-17 niilL 



South African Coasts. 



