208 GIBBULA. 



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

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

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



Mediterranean and Adriatic Seas. 



Trochus divaricatus LINX., St/at. Nat., xii, p. 1229. HANLEY, 

 Ipsa Linn. Conch., p. 319. HIDALGO, Mol 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. Cab., p. 193, t. 29, f. 

 16, 21. BUQ. DAUTZ. ET DOLLFUS, Moll, du Rouss., p. 391, t. 46, f. 

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

 T. rari/ineatus 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. 



May 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. PL 30, figs. 23, 24. PL 33, figs. 86, 87, 88. 

 Shell narrowly umbilicate, rarely im perforate, 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 strise between each ridge, and about a 

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

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

 rhomboidal, smooth within ; eolumella straightened in the middle ; 

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



European Seas, from Scandinavia to Gibralter; Black Seaf 



T. cinerarius LINN., Syst. Nat., xii, p. 1229. FORBES AND HAN- 

 LEY, Hist. Brit. Moll., t. 65, 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. cinerarius var. electissimns (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. 



