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Show 1880.J MR. E. A. SMITH ON NEW SHELLS. 483 his notice; he informs me, too, that, as far as his knowledge of this species extends, it exhibits but comparatively slight variation in point of size. Secondly, the form is not quite the same, the back being higher and more humped. But the chief differences are met with at the base. This part is certainly flatter than in any individual of C. thersites I have been able to compare, of a rich orange-red colour, which also extends up about one third of the sides of the shell. On the contrary, C. thersites is white upon both sides of the aperture, blotched and stained with black-brown towards the circumference of the base. The teeth on the outer lip are white, and almost always faintly streaked with brown above, the streak becoming broader and more intense in colour towards the margin ; they are also rather more numerous, and not bent over so deeply as in the present species, consequently the labrum is not so thick. Another distinctive feature consists in the body-whorl within the aperture being pure white; in C. thersites, judging from the series of specimens I have examined, it is invariably partially uncoated with callus, and of a brown mottled appearance. The aperture of C. thersites at the posterior end curves very much to the left; in the present form the curvature is very slight. Finally, the geographical distribution of C. thersites, according to Mr. Angas (P. Z. S. 1865, p. 170), "is very limited, the above-named locality (Salt Creek, Yorke's Peninsula, S. Australia) being the only place where it has hitherto been met with." On the contrary, the shell here described is North-Australian according to the statement of Mr. Jamrach, from whom it was purchased for the Museum. Presuming this to be correct, the probability of its specific distinctness becomes almost a certainty. TURBO (POMAULAX 1) TAYLORIANUS. (Plate XLVIII. fig. 9) Testa turbinato-conica, infra plana, imperforata, purpureo-rosea, strigis obscurioribus perobliquis indistincte notata, ad basin albida. Sptira breviter conica, marginibus rectiusculis. Anfractus circiter 8, declives, superne levissime concavi, inferne convexiusculi, ad suturam carina rugosa subsquamosa ornati, liris numerosis granulorum subcequalium parvorum cincti. Anfr. ultimus infra medium acute carinatus, supra carinam leviter excavatus, infra earn planus. Basis albida, zona externa purpureo-rosea cincta, seriebus concentricis granulorum ornata, in regione umbi-licali callo albo leevi flavo-marginato induta. Columella albo-callosa, arcuata. Alt. 40 mill., diam. max. 49. Hao. ? (From Mr. Lombe Taylor's collection.) This species is remarkable on account of its flattened base and the contrast of colour of the upper and lower surfaces. The granular series are about eleven in number on the penultimate whorl, rather more numerous upon the upper part of the last, upon the base of which they number about sixteen, whereof four or five nearest the circumference are of the same colour as the upper part of the shell, the rest bein°- nearly white. The entire upper surface between the P R O C . Z O O L . SOC".-1880, No. XXXII. 32 |
