GASTEROPODA. 837 
green colour, not unlike coarse specimens of P. vulgata. Its dark 
interior, radiated with yellow stripes of unequal length and breadth, 
and its brilliant umber-coloured and purple reflections, in fine speci- 
mens, quite rival P. tramoserica. It is also allied to P. ornata, Sow- 
erby. 
Figures 446, 446 a, 4466, outer, inner, and _ profile views of the 
shell. 
PaTeLLa sacirrata (Gould). 
Testa tenuis, translucida, ovato-rotundata, depressa, fusco-viridis, nigro 
obscure radiata, subtilissimé granuloso-slriata, apice antico, acuto, 
incumbente ; margine integro : facies interna argentea, cum reflexionr- 
bus succineis, et interdum fusco radiata ; fundo (luce transmisso) ele- 
gantissime reticulato, et maculis sagittatis radvato. 
Patella sagittata, Goutp. Proceed. Boston Soc. Nat. Hist., il. 148. 
July 1846. Expedition Shells, 7. 
SHELL thin, translucid, depressed, with an arched outline; apex at 
the anterior fourth, acute, projecting forwards; surface covered with 
regular, delicate, minutely granulated, radiating, and concentric strie. 
Colour dusky olive-green, with obscure radiations of dusky; but if 
held up to the light the whole shell is found to be most beautifully 
reticulated and radiated with arrow-head, dusky spots, often articula- 
ting with whitish. Interior minutely radiate-striate, bluish-silvery, 
with some amber-coloured reflections, and occasionally with imperfect, 
dusky radiations ; fundus more or less yellowish-green. 
Length an inch and three-quarters ; breadth an inch and one-tenth ; 
height two-fifths of an inch. 
Inhabits the Feejee Islands. C. Pickering. J. Drayton. 
This delicate and beautiful species is allied to P. testudinaria, but 
is more depressed and much more delicate in all its characters, 
and its peculiar markings by transmitted light, like to some of the 
Navicelle, distinguish it. The striz in some specimens look undu- 
lated. 
85 
