FISSURELLA. 165 



alternately green and white concentric rings, the perforation-callus 

 being green, usually bounded by a brown line. Margin strongly 

 crenulated. 



Length 34, width 22, alt. 10 mill, (average specimen.) 



Length 35, width 25, alt. 16 mill. 



Length 37, width 24, alt. 9* mill. 

 Charlotte Harbor, Florida, and Bermuda southward to Trinidad. 



Patella barbadensis Gmel., Syst., p. 3729. — Fissurella barbadensis 

 Lam., and of authors generally. — Patella porphyrozonias and rosea 

 Gmel.— F. antillarum Orb. Moll. Cuba ii, p. 198, t. 24, f. 40-42.— 

 F. edititia Reeve, Conch. Icon., f. 47. 



One of the most abundant species of Fissurella throughout the 

 West Indies. The very short orifice, more nearly round than in 

 any other species, is diagnostic, varying less than usual. The form 

 and sculpture of the shell is excessively variable. One delicate 

 variety has erect scales upon the larger ribs, and is painted with ten 

 or eleven rays composed of red lines. 



F. edititia Reeve (pi. 30, fig. 4) is a pretty color-mutation, with 

 the inter-liral spaces pink or red. 



Var. schrammii Fischer. PL 60, figs. 77, 78, 79. 



Shell depressed, oblong-ovate, decidedly narrower in front. Fis- 

 sure small, oblong ; radiately sculptured with 9 or 10 principal ribs 

 and numerous interstitial riblets, the larger ribs projecting at the 

 margins. Inside of a delicate green color, whiter around the mid- 

 dle, cream colored at the edge, the hole-callus brown. 



Length 23, width 14, alt. 4* mill. 



Guadeloupe ; St. Thomas. 



F. schrammii Fischer. Journ. de Conchyl. vi, p. 383, 1. 11, f. 5, 6, 

 1857. 



Var. intensa Pilsbry. PI. 60, fig. 76. 



Shell conical, long-ovate, chocolate colored, with some white rays 

 around the nearly circular, small hole, the peripheral margin buff; 

 radiating ribs very unequal, subsquamose. 



Length 18, breadth 12, alt. 5£ mill. 



Var. bermudensis Pilsbry. PI. 60, figs. 70, 71, 72. 



Shell elevated-conical, with ovate base ; of a delicate green tint all 

 over, or with reddish-brown lines in the narrow interstices between 

 the riblets. Sculpture composed of numerous radiating rounded 



