366 MOLLUSCA. 
but is nearly twice as large, more elevated, and proportionally broader ; 
the sculpture is more in relief, especially the radiating ribs, and the 
blue circle around the fissural opening is wanting. 
Figure 474, 474 a, 4744, dorsal, interior, and profile views of the 
shell; 474 c, details of sculpture, enlarged. 
FIssuRELLA VERNA (Gould). 
Testa solida, striata, ovalis, symmetrica, depresso-conica, cinereo-viri- 
descens, atro-purpureo radiata, costis ad viginti vel triginta sub-eleva- 
tas, planis, interstitiis adequantibus ; vertice subcentrah, purpureo: 
jissura parva, ovalis ; margine crenato: intus alliacea, fissure limbo 
radiatim striato, purpureo marginato. 
Fissurella verna, Goutp; Proceed. Boston Soc. Nat. Hist., ii. 155. 
August 1846. Expedition Shells, 13. 
SHELL symmetrical,“solid, depressed-conical, of a greenish ash- 
colour, and broadly rayed with dark purple; apex nearly central, 
purple at tip. Surface with a thin epidermis, and with about twenty to 
thirty depressed, nearly equal, flattish ribs, the intervening spaces of 
about an equal width, and subdivided by one or two strie. Aperture 
regularly oval, edge coarsely scolloped. Interior of a pale verdigris 
or leek-green colour. Fissure small, oval, surrounded interiorly with 
a finely striated callus margined with bluish. 
Length an inch and two-fifths ; width an inch and one-fifth ; height 
half an inch. 
Another specimen is smaller, more solid, more elevated and rounded, 
externally cinereous, the ribs smaller and rounded, without radiating 
strie, and without purple rays, but sometimes with dots about the 
apex; outline arched-conical, fissure elongated. Interior very pale 
green, the internal callus sometimes surrounded with violet; margin 
crenated on a smaller scale. 
Inhabits Porto Praya, Cape de Verde Islands. 
