OCR Text |
Show 666 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, colour white : mouth circular, not oblique or sloping : base notched on each side. L. 0*1, B. 0*35. 'Porcupine' Exp. 1870: Atl. St. 16. A single specimen. 9. CADULUS GIBBUS1, Jeffreys. (Plate XLIX. fig. 10.) S H E L L barrel-shaped, gibbous in the middle, whence there is an abrupt slope towards each end ; these are equal in breadth : it is rather solid, glossy, and semitransparent: sculpture none: colour white : mouth obliquely truncated: base slightly notched, but not quite perfect. L. 0*1, B. 0*05. ' Porcupine ' Exp. 1870, Atl. St. 13 ; a single specimen. Distribution. Bay of Biscay ('Travailleur' Exp., 1880); one specimen. Allied to C. ovulum of Philippi, but much smaller and not so oval, and the ends are equal in size. The last named species was dredged by Admiral Acton in the Bay of Naples, and by Dr. Fischer in the Bay of Biscay during the 'Travailleur' Expedition of 1880. Class GASTROPODA. Family I. CHITONID^. The controversial contributions to the vexed history of this confessedly abnormal group in a taxonomical and anatomical point of view seem to be endless. In the ' Proceedings of the Royal Society' for December 1880 will be found a careful and elaborate paper by Mr. A d a m Sedgwick on the kidney of Chiton, showing that Middendorff was right and Schiff and von Ihering were wrong as to the existence and position of that organ. Genus CHITON. A. Acanthochites, Leach. Girdle covered with spines, and having also tufts of bristles. 1. CHITON FASCICULARIS, Linne. C. fascicularis, L. S. N . p. 1106: B. C. iii. p. 211, pl. v. f. 2 ; v. p. 197, pl. Iv. f. 3. ' Porcupine ' Exp. 1869 : St. Lough Foyle. 1870 : Atl. Gibraltar B. Distribution. Norway to the ^Egean and Adriatic (but southern habitats unreliable); Mogador (McAndrew) ; 0-145 fms. Fossil. Pliocene: Coralline Ciag and S. Italy. Post-tertiary : Selsea. Perhaps the C. fascicularis of Linne may have been C. discrepans. In Philippi's collection at Berlin are specimens of both species named C. fascicularis. If the Linnean name has been misapplied, Pennant's name crinitus ought to be substituted for it. Leach called the present species Acanthochates vulgaris. Dr. Edward Brandt has examined and compared the nervous system of Chiton fascicularis and Patella vulgata. H e considers 1 Gibbous. |