340 MOLLUSCA. 
nent than the rest. The prevailing colour of the interior is that 
of ripe muskmelon. Sometimes there are dusky spots between the 
ribs. It seems to be found at all the islands of the Paumotu Group, 
and as far as ‘Taheiti. 
0 0 o 
Figures 44¥, 441 a, outer and inner views of the shell ; 44Yb, shell, 
with the animal ; 441 c, animal, with the shell in profile; 441 d, bran- 
chia; 441 e, marginal cirrhus. 
PATELLA ILLUMINATA (Gould). 
Testa inequilateralis, ovato-conica, fuliginosa, maculis sparsis flavidis 
translucidis illuminata, creberrimé radiatim costellata: apertura 
ovata ; facies interna nigro-picea, sericeo splendens ; fundo flavido. 
Patella illuminata, Goutp ; Proceed. Boston Soc. Nat. Hist., ii. 149. 
July 1846. Expedition Shells, 7. 
SHELL elevated conical, with an arched outline, the apex at about 
the anterior fourth; surface covered with numerous small, obtuse, 
radiating ribs, with from one to three intervening striz; concentric 
lines of growth crowded, very faint. Colour sooty, with scattered, 
yellowish spots, about twenty in number, somewhat regularly dis- 
posed, which are transparent when held up to the light, those near 
the margin elongated. Aperture ovate, the margin slightly irregular ; 
interior a very dark claret-colour, with brilliant silky and golden re- 
flections, and yellow spots, corresponding to those of the exterior ; 
central spatula dull buff-colour. 
Length an inch and a half; breadth an inch and a quarter; height 
three-fifths of an inch. 
From the Auckland Islands. Lieutenant Totten. 
This shell has the shape of P. argentea, and the interior like P. tra- 
moserica. It is very like P. cymbularia, which, however, is finely 
striated and in no wise costate, more rounded and more depressed 
pyramidal; its margin broadly everted, and its spatula dark chestnut. 
It may be the young of what is figured by Quoy as P. granularis. 
