205 



F. sieboldii RVE., Conch. Icon., f. 102, 1850. DUNKER, Ind. 

 Moll. Mar. Jap., t. G, f. 14, 15. SOWERBY, Thes., p. 193, f. 138. 



F. octagona, nigro-ocellata of Rvc. and F. varicosa Sowb. are prob- 

 ably forms of this species. The original descriptions and figures are 

 given below. 



F. odagona Rve. (pi. 39, fig. 97). Shell ovate, rather elevated, 8- 

 ribbed, with small minutely granulated ridges in the interstices; 

 orifice ovate, rather broad, inclined anteriorly ; whitish with broad 

 light-brown rays near the margin, bluish around the orifice. Length 

 6 mill. Ticao, Philippines. (Couch. Icon.,/. 11G.) 



F. niyroocellata Rve. (pi. 39, fig. 98). Shell ovate, rather elevated, 

 strongly radiately and concentrically ribbed, ribs rather distant, 

 interstices thickly latticed ; orifice orbicular; white painted with a 

 row of black spots near the margin. Length 5=} mill. Ticao, 

 Philippines, in 6 fms. (Conch. Icon.,/. 117.) 



Both of these are evidently young shells. 



F. varicosa Sowb. 2d. (pi. 63, figs. G, 7.). Oblong, conical, apex 

 elevated, with three large radiating strongly nodulose ribs behind, 

 six large ones in front with smaller riblets in the interstices ; 

 cancellated by elevated, distant concentric lines. Internal callus 

 scarcely septiform ; orifice small, round, situated at and inclined to- 

 ward the front. It is not internally chambered as in F. calyculata. 

 The three posterior prominent ribs are very coarsely knobbed. 

 China Seas. (Thes. Conch. Hi, p. 193, /. 52, 53.) 



Group of F. grceca Linn. 



Coarsely latticed by radiating ribs and concentric cords. 

 G. GR^ECA (L.) Auct. PL 35, figs. 7, 8, 9, 10. 



Shell oval, usually a little narrower in front, depressed or ele- 

 vated ; lateral slopes nearly straight, front slope straight or subcon- 

 cave, posterior slope a little convex, sculpture consisting of strong, 

 elevated radiating ribs, alternately larger and smaller, usually with 

 minute riblets in some of the interstices, latticed by elevated con- 

 centric lirse, rendering the ribs nodose at their intersections, and cut- 

 ting the interstices into square pits. 



The color is whitish-yellow or brown, unicolored or rayed with 

 darker brown. The inside is white, margin strongly denticulate, 

 toothlets generally in pairs. Length 26, breadth 18, alt. 8-11 mill. 



Mediterranean and Adriatic Seas ; Atlantic, from Southern English 

 coast to Gibraltar. 



