Report on the zoological collections made in the Indo-Pacific Ocean ...

;72 COLLECTIONS FROM MELANESIA,characteristic of T. speciosus. ZizipMnus comptas, A. Adorns, is adifferent species from that described hy I'hilippi, and has since beendescribed by Souverbic under the name of T. poiqnneli.90. Trochus (Calliostoma) decoratiis.Trochus decoratus, Philij^jn, Con.- Cab. pi. 13. fig. 1.Zizyphinus decoratus, lieeve, Conch. Icon. fig. 28 ;A. Adams, Proc.Zool. Sac. 1851, p. 1G5.Hah. " ? " {Pliilippi) ; Brisbane waters, East Australia ( i?reve)Sj'duey and Port Jackson {Coppinger and Lieut. A. Smith, li.N.).The interior of the aperture of this species, close to the outer andbasal margin, is thickened ^^ith a whitish and more or loss cloudypearly deposit, which conceals to some extent the beautiful iridescenceobservable further within.91. Trochus (Calliostoma) rubropunctatus.Ziziphinus rubropuuctatus, A. Adams, Proc. Zool. Soc. 1851, p. 1(37Reeve, Condi. Icon. fig. 56.Hah. ? {Adams t|' Reeve); Albany Island, F. Australia, in3-4 fms. on a muddy bottom, and Port Darwin, ^.W. Australia,8-12 fms. {Coppingtr).This is a most charming little species, and readilj' recognized byits peculiar painting and remarkable sculpture. Adams describesthe colour as " lutescens." I should rather consider it pale fleshypink, with dark red dots in the interstices between the obliquecostre and the transverse or spiral ridges. The latter are said to befour in number on the last whorl ; but on careful examination I findsix, of which four are, however, more prominent than the rest.The tipper volutions are encircled by three principal liroe, and afourth secondary one at the suture. The points of intersection ofthese spiral ridges and the oblique costse are produced into quiteacute nodules or prickles. The base of the shell is almost flat,ornamented with about six concentric liroe, which are more or lessgranulous, with the interstices exhibiting strong lines of growthand translucent nacre. The colour closely approaches the rest ofthe surface, varied with brown dots both upon and between thegranules.92. Trochus (Thalotia) torresi. (Plate VI. fig. A.)Shell sharply conical, subperforated or with the perforation concealed,greenish (sometimes pinkish red), with oblique white narrowstripes and darker green (or rosy black) spotting at the base of thewhorls and iipon the angle of the last. Volutions about 8, flat,margined at the lower part with two rows of closely packed granulesrather more prominent than five others above. Between these, inwell-preserved specimens, very fine lira? (one in each interstice) andoblique lines of growth are discernible. Last whorl rather acutelyangled at the periphery, beneath with about nine concentric rows of