208 GIBBULA. 



rounded-quadrate ; outer lip bevelled to an edge, very thick and 

 smooth within ; columella straightened in the middle, pearly ; um- 

 bilicus narrow or concealed. Alt. 15-23, diam. 16-19. mill. 



Mediterranean and Adriatic Seas. 



Trochus divaricatus Linn., Syst. Nat., xii, p. 1229. — Hanley, 

 Ipsa Linn. Conch., p. 319.— Hidalgo, 3IoI. Mar. Esp., t. 61, f. 4-8. 

 — Deshayes, Ann. de Malac. i, t. 2, f. 4 (animal). — Fischer, Coq. 

 Viv., p. 139, t. 47, f. 1, 2.— Philippi, Conchyl. Gab., p. 193, t. 29, f. 

 16, 21. — BuQ, Dautz. et Dollfus, Moll, du Bouss., p. 391, t. 46, f. 

 15-22. — Mondonta Lessoni Payr., Moll, de Corse, p. 139, t. 7, f. 3, 4. 

 — T. rarilineatus MiCHAUD, Actes Soc. Linn. Bord., iii, p. 266, f. 12 

 (1829).— BuQ. Dautz. et Dollf., Moll. Rouss., p. 393, t. 46, f. 23- 

 27. — Gibbula purpurata Brusina, Conch. Dalm. ined., p. 26. 



jNIay be known by the very thick, heavy shell and peculiar 

 painting. 



Var. rarilineata Michaud. PL 33, figs. 90, 91. 



Smaller, more conical, with angulate periphery and flattened 

 base. Alt. 12, diam. 13 mill. 



G. cineraria Linne. PI. 30, figs. 23, 24. PI. 33, figs. 86, 87, 88. 

 Shell narrowly umbilicate, rarely imperforate, conical, thick, cin- 

 ereous, densely marked with numerous narrow longitudinal brown 

 or reddish lines, or broader stripes ; whorls 6, flattened, with 7 or 8 

 thread-like spiral ridges on the upper surface of the body-whorl, 

 with often one or two finer stride between each ridge, and about a 

 dozen fine ridge-like striiB on the under side; the last whorl angu- 

 late at the periphery, somewhat convex beneath ; aperture sub- 

 rhomboidal, smooth within ; columella straightened in the middle ; 

 umbilicus narrow. Alt. 13-16, diam. 14-16 mill. 



Eurojjean Seas, from Scandinavia to Gihralter; Black Seaf 



T. cinerarins Linn., Syst. Nat., xii, p. 1229. — Forbes and Han- 

 ley, Hist. Brit. Moll., t. Qb, f. 1-3.— Jeffreys, Brit. Conch., t. 62, 

 f. 3.— Philippi, Conchyl. Cab., p. 222, t. 34, f. 2-4.— Fischer, 

 Coq. Viv., p. 192, t. 62, f. 4.— T. lineolatus Michaud, Galerie, i, p. 

 334, t. 30, f. 8-9. — T. cl'ierarins var. electissimus (Bean) Thorpe, 

 Brit. Mar. Conch., p. 264. — T. fumosus Philippi, Zeitschr. f. Mai. 

 1849, p. 156 ; Conchyl. Cab., p. 304, t. 44, f. 5. 



Var. ELECTissiMA (Bean) Thorpe. 

 Smaller and more regularly conical. 



