OCR Text |
Show 1879.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 573 'Valorous' Exp., Spitzbergen, Loffoden Isles to G. of Egina, * Challenger' Exp. (off Culebra I., Danish West Indies) ; 20-1170 fms. Fossil. Pliocene and Post-tertiary. Norway, Coralline Crag (not Belgian), S. France, Italy, Rhodes ; 0-100 ft. Var. septentrionalis. Larger, more triangular and oblique, and finely striated lengthwise, but not reticulated. This form resembles that of the next species. 'Lightning' Exp.: St. 135. 'Porcupine' Exp. 1869: St. 23a. 1870: Atl. 16, 17, 17a. Distribution. ' Bulldog' Exp., Norwegian arctic Exp. 1876, 1877, and 1878, Dutch arctic Exp., Finmark; 146-656 fms. Fossil. Pliocene. Palermo and Messina, with the typical form. Risso described this species in 1826 as A. grenophia ; but the name may be considered obsolete. It is also the A. raridentata of Searles Wood. 10. ARCA FRIELEI, Jeffreys. (Plate XLV. figs. 4, 4 a.) A.frielei (Jeffr.), Friele in Mag. f. Naturvid. xxiii. h. 3, p. 2 (1877). ' Porcupine' Exp. 1869: St. 65. Distribution. Norwegian arctic Exp., 1876-8; 459-1333 fms. Named in honour of Herr Herman Friele of Bergen, who undertook with such ability the charge of the Mollusca in the last-mentioned expeditions. This and the preceding two species belong to the section or subgenus Cuculleea, in which the teeth are comparatively few and placed obliquely. A.frielei has been lately figured in the Jahrb. d. D. malak. Ges. Ht. ii. 1879, t. 4. f. 9; but the hinge is represented as toothless, and I therefore have it refigured. G L O M U S NITENS, Jeffreys. (Plate X L V . figs. 5, 5 a.) G. nitens, Jeffr. in Ann. & Mag. N. H. Nov. 1876, p. 433. ' Porcupine' Exp. 1869 : St. 16, 19a, 20, 21, 22, 30, 31, 39. Distribution. ' Valorous ' Exp.; 1750 fms. The genus Glomus is remarkable for its globular shape, its elongated and slanting cartilage, and the teeth being few and set obliquely. SILICULA ', Jeffreys. S H E L L oval or oblong, open at the anterior or longer end : cartilage internal, minute : teeth laminar, parallel with the hinge-line, and not at right angles to it or diagonal, as in other genera of the Arca family. I at first thought of Phaseolus as an appropriate generic name; but as that is so well known in Botany, I have substituted Silicula for tbe Mollusk. The type, which I will now describe, somewhat resembles an Estheria in shape; but tbe valves of the carapace in the Crustacean are punctated, and there is no true hinge. The Abbe Brugnone and the Marchese di Monterosato have discovered in the Tertiary formation at Ficarazzi, near Palermo, a minute fossil species of Silicula, for which the name ovata is proposed. 1 A little pod. |