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Show 1883.] ' L I G H T N I N G ' A N D ' PORCUPINE'EXPEDITIONS. ' 101 16. TROCHUS DELICATUS1, Jeffreys. (Plate XX. fig. 7.) S H E L L forming a depressed cone, thin, opaque, rather glossy : sculpture, on the body or last whorl only, fine and close-set spiral stria?, crossed by equally numerous curved longitudinal striae ; the spiral striae are wanting below the suture, and are few and slight on the base ; periphery bluntly keeled ; umbilicus partly enclosed by a small ridge, which extends through the middle of the inside and becomes thicker outside ; all the upper whorls are quite smooth: colour milk-white : whorls 4\, moderately convex, the last occupying about three fourths of the shell; apex somewhat twisted: mouth roundish : outer Up thin : inner lip filmy : inside slightly nacreous : umbilicus small but deep. L. 0*075, B. 0*125. 'Porcupine' Exp. 1870: Atl. St. 24. A single and imperfect but characteristic specimen. 17. TROCHUS VARIUS, Linne. T. varius, L. S. N. p. 1229 ; Philippi, Moll. Sic. i. t. x. f. 19. ' Porcupine' Exp. 1870 : Atl. St. Vigo B. Bistribution. Gulf of Gascony (de Folin), Mediterranean and Adriatic; 0-2 fms. Fossil. Pliocene: Italy. T. roissyi, Payraudeau, and T. varians, Deshayes. Var. Gibbula elata, Brusina. 18. TROCHUS CINERARIUS, Linne. T. cinerarius, L. S. N. p. 1229 : B. C. iii. p. 309; v. p. 203, lxii. f. 3. 'Porcupine' Exp. 1869 : St. L. Foyle, near Belfast. 1870 : Atl. Vigo B., 26. Bistribution. Iceland, Finmark, and Faroe I. to the Lusitanian coasts, Mogador, Mediterranean, Adriatic, and Black Sea ; 0-60 fms., inhabiting the littoral and laminarian zones. Fossil. Pliocene: Red Crag. Post-tertiary: Scandinavia and British Isles ; 0-600 ft. Variable in size and the comparative height of the spire. Synonyms rather numerous. Among these or as representing varieties are Trochus lineatus of Da Costa, T. philippii of Aradas, and T. cineroides of Searles Wood. Not T. cinerarius of Born, Broechi, Olivi, O. G. Costa, or Bellardi. M y variety variegata is not Monodonta agyptiaca of Payraudeau, which is Trochus fanulum of Gmelin. 19. TROCHUS VILLICUS, Philippi. T. villicus, Phil. Moll. Sic. ii. p. 152, t. xxv. f. 14. ' Porcupine' Exp. 1870 : Atl. St. Vigo B.; Med. 50. Bistribution. Mediterranean, Black Sea, and Adriatic ; 0-20 fms. Closely allied to T. cinerarius, and perhaps a variety of it. It may have been included in Linne's too short description of that species. 1 Delicate. |
