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

MOLLUSCA. 7188. Trochus (Isanda) coronata. (Plate V. figs. P-P 2.)A. Adams, Proc. Zool. Soc. 1853, p. 189, & 1854, pi. 27. %. 5 ; GeneraRec. Moll. pi. 46. fig. 2 Chonn. Man. Conch, fig. 2G1G.;Var.=I. lepida, A. Adams, P. Z. S. 1853, p. 190.Hah. Port Curtis, 7 fms., and Priday Island, Torres Straits, outhe beach {Goppinger) ; South Australia {Caming).With the exception of differences in colour and the height of thespires, there ajjpears to be little or no sufficient reason why the twoabove-named forms should be specifically separated. The subangulationof the body-whorl, said to exist in /. h-jrUia, is very slight andequally present in /. coronata. The types of the latter are describedas being ornamented with white transverse lines and brown spots,arranged in transverse series and having a broad white band at thesutures. This band is not in fiict at the suture, but just below thecoronation of the whorls, the latter portion and the channelled topbeing coloured like the greater part of the shell. This stylo ofpaintiiig is far from constant. Two specimens presented to theBritish Museum by A. Adams, Esq., lack the conspicuous whitebaud, but have the entire surface covered with oblique, slightlywavy, pinkish-brown stripes, resting upon a pinky-wJiite ground.A single specimen dredged by Dr. Coppinger at Port Curtis exhibitsthe typical coloration, with the exception of having a second whitetransverse zone just below the periphery of the last volution.Another example from Friday Island more nearly resembles thevariety previously mentioned ; but the oblique stripes are lessregular, being more interrupted and in the form of spots.Mr. Adams describes the inner lip of this genus as " straight,forming an angle with the outer lip." This description is scarcelyaccurate. All the specimens which I have examined have thecolumella a little oblique, slightly incurved at the upper part andmiddle, and then prominent anteriorly, terminating in an indistinctsubtruneation, or, in other words, it is subnotched at the base at thetermination of the double series of tubercles surrounding the umbilicus.It is very slightly expanded and connected with the upperextremity of the outer lip by a thin callosity (which is subtubercularin adult shells) upon the whorl close to the end of the columella.The aperture has a thin coating of nacre, which in worn shells isnot very apparent.89. Trochus (Calliostoma) speciosa.Ziziphinus speciosus, A, Adams, Proc. Zool. Soc. 1854, p. 38 ;Conch. Icon., Zizyphiuus, sp. 9, figs. 9 a, h.Peeve,Hah. Port Curtis, Queensland, 1-\\ ims,. {Coppinger) \ MorctonBay {Mr. Strange).In form this species a])proachcs 7'. couitus of Phi]ij)pi, whicli,however, in addition to difference in colour, does not possess thepeculiar smooth orange-yellow callosity at the umbilical region so