GASTEROPODA. 367 
Much like F. obtusa, Sowb., but more elongated, and with its ribs, 
more numerous rays and faintly scolloped margin, as well as its dis- 
tant locality, it may be regarded as a different species. Some speci- 
mens are not rayed, and others are entirely dark purple. 
Figures 472, 472 a, dorsal and interior views of the shell; 4728, pro- 
file view ; 472 c, dorsal view of the small variety. 
FIssuRELLA CRATITIA (Gould). 
Testa solida, elevata, ovalis, allnda, radius fuscis ad sexdecim picta, 
lineis elevatis radiantibus et concentricts sub-equalibus profunde im- 
bricato-cancellata : apice sub-centrali, intus alba ; margine inequaliter 
crenulato: foramen apicalis sub-rotunda. 
Fissurella cratitia, Goutp ; Proceed. Boston Soc. Nat. Hist., ii. 155. 
August 1846. Expedition Shells, 13. 
SHELL solid, oblong-oval at base, the apex elevated, and somewhat 
anterior. Colour whitish, with about sixteen rays of dusky brown. 
Surface marked with small, radiating, elevated strie, some of which 
might be called ribs, crossed by obtuse, concentric, somewhat imbri- 
cated lamelle, thus forming deep cancelli. Foramen rather large, 
rounded oval. Interior white; margin irregularly crenulated, and 
often striated. 
Length two inches; breadth an inch and two-fifths; height half an 
inch. 
Inhabits Puget Sound. C. Pickering. 
It has the general aspect of F’. maxima, but is sculptured like F. 
Graca. 
Figure 471, dorsal view of the shell; 471 a, profile view of the 
shell. 
FissurRELLA Picta (Lamarck), Anim. sans Vert., vii. 590. Sow- 
ERBY ; Conch. IIL, f. 4, 26. 
