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Show 1882.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 675 Family III. FISSURELLID^E. 1. FISSURISEPTA GRANULOSA1, Jeffreys. (Plate L. fig. 9.) S H E L L roundish-oval, conical, but somewhat depressed except towards the apex, thin, opaque, and lustreless: sculpture, very numerous fine and delicate striae which radiate from the apex or beak, and are closely covered with minute tubercles ; some of these stria? do not quite extend to the apex, and are alternately larger and smaller; the apex is irregularly tubercled : margin finely crenated or notched by the striae : foramen nearly circular : inside smooth, hut not polished : septum triangular, covering about half only of the foramen on the underside. L. 0*125, B. 0*1. ' Porcupine' Exp. 1870: Atl. St. 24. A single specimen. Distribution. Drbbak, Norway ; 50 fms. In my paper on Norwegian Mollusca ('Annals and Magazine of Natural History ' for June 1869) I named this remarkable shell as F. papillosa of Seguenza; but I afterwards found that I was mistaken as to the species. The shell now described is more delicate, and the sculpture is much finer, with regular and close-set striae which are studded with far more numerous and minute tubercles. The foramen is circular in the present species, and triangular in F. papillosa. Seguenza's genus Fissurisepta differs from Fissurella in having an internal septum or plate, as in Propilidium and Puncturella, and a foramen as in the last named genus; but it wants the spire which is peculiar to those two genera, and which is never deciduous. 2. FISSURISEPTA PAPILLOSA, Seguenza. F. papillosa, Seg. Paleont. Malac. d. Messina (Ann. dell' Accad. d. Aspir. Nat. 1862), separate copy, p. 10, tav. iv. f. 2, 2a, 2b. 'Porcupine' Exp. 1870: Atl. St. 16, 17, 17a. Several specimens. Fossil. Miocene ? : Rometta near Messina. Pliocene : Calabria. This species varies with respect to the size of the tubercles or papillae. Some recent and fossil specimens have very few and slight scattered tubercles, or are nearly smooth. The recent are rather larger than the fossil specimens, and have usually stronger tubercles. 3. FISSURISEPTA ROSTRATA, Seguenza. F. rostrata, Seg. Paleont. Malac. d. Messina (Ann. dell' Accad. d. Aspir. Nat. 1862), separate copy, p. 10, tav. iv. f. 3, 3a, 3b. ' Porcupine ' Exp. 1870 : Atl. St. 16, 17, 17a. Several specimens of this extraordinary shell, exactly agreeing with fossil specimens from Sicily which I received from my kind friend and correspondent, Prof. Seguenza. Distribution. Bay of Biscay ('Travailleur' Exp. 1881); 1093 fms. Off Bermudas (' Challenger ' Exp.) ; 1375 fms. Fossil. Miocene ? : Sicily. Pliocene : Sicily. 1. P U N C T U R E L L A PROFUNDI, Jeffreys. (Plate I., fig. 10.) P. profundi, Jeffr. in Ann. & Mag. N. H. March 1877, p. 232. 1 Covered with granules. |
