62 TROCH US. 



whorls 5, the first whitish, often eroded, the last brownish, purplish 

 or red, obliquely striated, and ornamented with spiral granulose line, 

 3 on penultimate, 8 or 9 on last whorl, of which the first is composed 

 of larger beads, and the fourth forms the periphery, the interstices 

 about as wide as the line ; last whorl somewhat gibbous and descend- 

 ing toward the aperture, which in adult specimens is somewhat con- 

 tracted and subtrigonal, outer lip witli a few deeply entering line 

 within, the upper one terminating in a small denticle; columella 

 short, concave, smooth, terminating in an acute narrow denticle, 

 which is separated from a similar smaller tubercle on the base by a 

 narrow notch. Alt. 8, diam. 1 1 ; alt. 8, diam. 9 ; alt. 9, diam. 11-13 

 mill. 



Adelaide, Cape Riche, St. Vincent's Gulf t S. Australia ; Port Philip, 

 Melbourne, Bass, Straits. 



T. (Monodonta) dunkeri Kocn, in PmLirpi, Abbild. u. Beschr. 

 neuer ConchyL, i pt, 3, p. 67, t. 2, f. 5. 1843. PHI LI PPI, Conchy I. 

 Cab., p. 237, t. 36, f. S. Clnnculm rubens ("A. AD.") ANGAS, P. Z. 

 S. 1865, p. 178 TENISOX-WOODS, Proc. Roy. Soc. Tasmania, 1878, 

 p. 40. Trochus dunkeri FISCHER, Coq. Viv., p. 361, t. 96, f. 2, 

 (1880). BRAZIER, Proc. Roy. Soc. Tasmania, 1886, p. 202. 



The typical form of this shell is shown in figs. 26, 27 of pi. 14 ; the 

 figures and description given by Fischer are of a depressed variety. 

 In several specimens measured by me the altitude is nearly equal to 

 the diameter. The synonymy was first worked out by Mr. BRAZIER, 

 from whose excellent description the first lines of my own are 

 quoted. This shell is allied to the T. yatesi, but is more solid, more 

 compact, and less carinated at the periphery ; its spiral line are fewer 

 than in that species. The umbilicus is remarkably shallow for a 

 Clanculus. 



A 



The two following species are similar to certain forms of the section 

 Clanculopsis in lacking a distinct tubercle at the base of the col- 

 umella ; I am however inclined to group them with the preceding 

 species, which they resemble in general aspect. 



T. GUINEEXSIS Gmelin. PI. 10, figs. 3. 4. 



Shell conical, very solid, rather depressed, angulate at the periph- 

 ery, deeply umbilicate, whitish, painted with broad radiating purplish 

 brown stripes above, base with narrow radiating stripes or tessella- 

 tions of the same shade; whorls about 6, planulate or slightly con- 

 cave above, the apex whitish, eroded, the succeeding whorls spirally 

 beaded, the last whorl slightly descending anteriorly, bearing on 



