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Show 60 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jan. 20, 2. CERITHIOPSIS DIADEMA (Watson), Monterosato. (Plate VI. figs. 8, 8 a.) C. diadema (Watson), Monterosato in Journ. de Conch. 1874, p. 273. 'Porcupine' Exp. 1870: Med. St. 45, Benzert Road, Rasel Amoush, Adventure Bank. Distribution. Cap Breton (De Folin), G.Tunis ('Shearwater' Exp.)!, Sicily (Stefanis and Monterosato)!, Madeira (Watson)l, Canaries (McAndrew) !, Azores (' Challenger ' Exp.) ! ; 22-500 fms. Fossil. Post-tertiary : Messina (Seguenza). C.fayalensis, Watson, in Journ. Linn. Soc. (Zool.) vol. xv. p. 125, 1880. I had proposed to name it C. fibula1. This pretty little shell, which was partly described by Monterosato, differs from C. tubercularis in being cylindrical, more elongate, narrow, and slender ; its spire is finely tapering ; and some of the longitudinal ribs are set obliquely. The uppermost whorl forms a smooth bulb, and the next two whorls are closely and rather obliquely ribbed lengthwise and crossed by a delicate spiral line near the base of each of those whorls, so as to give the apex an angulated appearance. 3. CERITHIOPSIS HORRIDA2, Jeffreys. (Plate VI. figs. 9, 9 a.) S H E L L elongated, thick, opaque, and somewhat glossy : sculpture, numerous and crowded strong tubercles or nodules, which cover the surface and give it a rugged aspect; there are 4 rows of tubercles on the last whorl, and 3 on each of the upper whorls, except the two uppermost; the first or topmost is bulbous or globular and smooth, and the second is marked lengthwise with several short curved ribs; the base is concave and encircled by a slight ridge: colour pale brownish-yellow : spire tapering and turreted ; apex blunt: whorls 15-16, rather flattened or compressed; the last equals about one fourth of the shell: suture narrowly channelled and distinct: mouth squarish, truncated at its base: outer lip thickened: inner lip forming a thick fold or deposit on the lower part of the pillar, which is nearly straight : canal very short and triangular. L. 0'35, B. 0-075. 'Porcupine' Exp. 1870 : Med. St. Rasel Amoush. Distribution. Sicily (Monterosato), Smyrna (McAndrew), Madeira (Watson) ; 16-49 fms. 4. CERITHIOPSIS BARLEEI, Jeffreys. C. barleei, B. C. iv. p. 268 ; v. p. 217, pi. lxxxi. f. 2. 'Porcupine' Exp. 1869: St. 9. Distribution. British and Irish coasts, Arcachon (Lafont) !, Cap Breton (De Folin) !, Naples and Sicily (Tiberi and others) ! ; 25-40 fms. 1 Whether it is the species which Mr. Watson proposed to name diadema may be questionable; but it quite agrees with the notice of that species given by Monterosato. 2 Rough. |
