V 



GLYPHIS. 211 



lets of somewhat larger size, having three smaller intermediate rib- 

 lets in each interval. 



The shell is solid, strong. Color whitish or grayish yellow, uni- 

 colored or having ill-defined darker rays or occasionally a concen- 

 tric band. Inside white, often with a concentric bluish zone; bor- 

 der finely denticulate, the toothlets usually in pairs ; basal margin 

 more or less arched, the ends alone supporting the shell. Length 

 57, breadth 40, alt. 20 mill. ; often smaller, L. 44, br. 29, alt. 16. 

 Mediterranean and Adriatic Seas; Cape Verde Is. 



F. Itallca Defr., Diet. Sc. Nat. xvii, p. 79, 1820. — Buq., Dautz. 

 & Dollf., Moll. Mar. Rouss. p. 476, t. 53, f. 1-3.— F. costaria 

 Desh., Coq. Foss. Env. Paris, t. 2, f. 10-12, 1824.— Phil., Enum. 

 Moll. Sicil. i, p. 116, and of others. — F. defrancia Rrsso, Eur. Merid. 

 iv, }). 258.-7". neglecta Desh., Encyc. Meth. ii, p. 138, 1830, and 

 of authors generally. — F. mediterranea Gray in Sowb. Conch. 

 Illustr. f. 30. — F. crassa and F. tectump>ersicum O. G. Costa, teste 



MONTEROSATO. 



This form, usually known as F. neglecta Desh., is larger than 

 other Mediterranean Fissurellidoe. [t differs moreover in the close 

 rounded riblets, decussated by very fine concentric stria?. It is 

 widely distributed as a fossil (Miocene to Quaternary) in Europe. 



The mutations noted by Buquoy, Dautzenberg and Dollfus are 

 as follows: (1) conica Monts. (==elevata Monts. olini) ; (2) major 

 Fischer; (3) minor Monts. ; (4) depressa Monts., very much flat- 

 tened ; (5) latereplicata Monts., an exaggerated form of the preced- 

 ing, the lateral borders being upturned. 



G. alternata Say. PI. 37, figs. 50, 51, 52, 53; pi. 61, figs. 24, 



25. 



Shell oval, elevated, conical, front slope straight or concave, back 

 slope convex ; surface closely, finely latticed by radiating riblets 

 (every fourth one slightly larger) and concentric elevated lirulse or 

 lamiine, which form little scales where they cross the radiating rib- 

 lets. 



Color grayish-yellow or buff, unicolored or radiately striped with 

 pink, black or brown ; the stripes are eight in number, often broken 

 into angular spots ; sometimes unicolored blackish specimens occur. 

 Summit in front of the middle, more or less curved forward. Fis- 

 sure key-hole-shaped, not encircled by a dark line. Inside white ; 



