OCR Text |
Show 1882.] 'LIGHTNING'AND'PORCUPINE' EXPEDITIONS. 669 more raised and oval at the sides ; under a microscope can be detected numerous and close-set lines or striae, which are arranged lengthwise : colour whitish: beaks none, except on the tail-plate, where they are nearly circular : inside glossy. L. 0*1, B. 0*05. 'Porcupine' Exp. 1870: Atl. St. 3 a, 17. Two specimens. Although this is a very small species, and might be regarded as the young of some other species, I must observe that I have carefully compared both specimens with the young of all other European species of Chiton known to me, and some specimens of which last mentioned species are much smaller than those which I have now described. The peculiar character of having so very few and scattered tubercles is not presented by any other of those species. The girdle is membranous and thin. 9. CHITON MARGINATUS, Pennant. C. marginatus, Penn. Brit. Zool. iv. p. 71, t. xxxvi. f. 2 ; B. C. iii. p. 221 ; v. p. 199, pl. lvi. f. 5. 'Porcupine' Exp. 1870: Atl. St. Vigo B. Distribution. Greenland (coll. Moller, in mus. Copenhagen), Faroe I., Norway to Mogador, Mediterranean and Adriatic, eastern and western coasts of North America; 0-40 fms. Fossil. Pliocene : Sicily (Monterosato). Post-tertiary : Norway, Selsea; 0-100 ft. C. cinereus of Laskey, Lowe, and Forbes and Hanley (not of Linne), C. variegatus of Philippi and other authors, and C. dentiens of Gould. D. Lophyrus, Poli. Girdle imbricated or regularly granular. 10. CHITON ALBUS, Linne. C. albus, L. S. N. p. 1107: B. C. iii. p. 220; v. p. 199, pl. lvi. f. 3. 'Lightning' Exp., St. 1, 2, 5. Distribution. Spitzbergen, Novaia Zemblia, Russian Lapland, White Sea, Finmark southward to Isle of Man, Faroe Isles, Iceland, Greenland, Wellington Channel, Behring Strait, eastern and western coasts of North America; 0-337 fms. Fossil. Post-tertiary : Fort William. Family II. PATELLID^E. PATELLA VULGATA, Linne. P. vulgata, L. S. N. p. 1258: B. C. iii. p. 236, pl. v. f. 3; v. pl. lviii. f. 1-4. 'Porcupine' Exp. 1869, St. Donegal B. 1870: Atl. Gibraltar B. Distribution. Throughout the western coast of Europe from the Faroe Isles and Bergen to Gibraltar, as well as the Mediterranean and Adriatic; between tide-marks and even above high water, on |