206 GLYPHIS. 



Patella grceca Linn., Syst. Nat. xii, p. 1262 (doubtful). — Fissur- 

 ella grceca Desh., Scacchi, Philippi, Lamarck, Dunker, Jef- 

 freys, Weinkauff, Buq., Dautz. & Dollf. and others. — Patella 

 reticulata Donovan, Brit. Sh. i, t. 21, f. 3. — Fissurella reticulata 

 Forbes & Hanley, Brit. Moll, ii, p. 469, t. 63, f. 4, 5, and of some 

 others. — F. mamillata Risso, Eur. Merid. iv, p. 257, t. 10, f. 145. — 

 F. dominicana O. G. Costa, Catal. Taranto, p. 43, t. 4, f. 2. — F. 

 corrugata Costa, /. c. p. 44, f. 3. — F. recurvata Costa, /. c. p. 44. — 



F. occitanica Recl., Rev. Zool. Cuv., p. 111. — Cemoria montaguana 

 Leach, Syn. Moll. Gt. Br. p. 213, t. 10, f. 6. 



An excessively variable species. The surface in the more typi- 

 cal forms is cut into square pits by the strong riblets and concentric 

 lira?. There is much doubt as to whether this is really the Patella 

 grozca of Linmeus, but the use of that name by the great majority 

 of authors has fixed it too firmly to be changed; especially since 

 the name reticulata Don. is preoccupied by Linnaeus. 



It is smaller than the West Indian G. listeri, and the fissure 

 is more anterior. 



The named mutations are as follows: (1) conica Req., summit 

 much elevated; (2) gibba Jeffr. (not Phil.!), form elevated, the 

 apex more anterior than in the type, base strongly arched ; (3) 

 depressa Monts., depressed, the reticulation obsolete ; (4) ima Greg., 

 still more depressed. Palermo ; (5) mucronata Monts., large and 

 coarsely latticed ; (6) minor Marion. 



G. listeri Orbigny. PL 37, figs. 37, 38, 39 ; pi. 62, fig. above 31, 

 32. 



Shell ovate, conical, elevated, summit a little in front of the 

 middle ; front slope straight, back slope somewhat convex. Sculpt- 

 ure consisting of numerous strung radiating ribs crossed by elevated 

 concentric cords which render the ribs nodose at their intersections 

 and cut the interstices into square pits. 



The shell is solid, grayish-white or buff, unicolored or having 

 radiating black stripes. The radiating ribs are usually alternately 

 large and small ; the concentric cords are equally spaced and prom- 

 inent. The perforation is key-hole shaped, encircled at the edge by 

 a blackish line. Inside white, the hole-callus either white or 

 bounded by a blue-black line. Border crenulated, the denticulations 

 in pairs. Length 40-42, breadth 29-30, alt. 15-17 mill. Specimens 

 of ordinary ,<ize measure 25-30 mill, in length. 



Florida Keys to Nicaragua and Barbados ; West Indies generally. 



