PATELLA. LIMPET. 
137 
* 6. Patella pellucida. Blue-rayed Limpet. 
Lister , pi. 543. f. 27— Pennant , pi. 93. f. 4, right hand 
middle fig.— Costa, pi. 1. f, 5— Donovan , pi. 3. f. 1— ■ 
Dum 5 / CW. ph 23. f. 5. 
Shell very thin and transparent, obJong-oval, regularly 
convex, quite smooth, of a pale yellowish-horny color and 
nearly the same inside : crown obscure, near one end, 
marked with a dark blue or purple spot, from which ema¬ 
nate from three to seven dotted lines of the richest azure 
blue, but generally four in number, and extending longitu- 
dkJiy towards the opposite margin : length hardly three 
ipaiters of an inch ; breadth about half as much. 
On the leaves and stalks of Fuci. v. v. 
i /. Patella 1 arris. Smooth Limpet . 
Lhtcr , pi. 542. f. 2 6— Da Costa, pi. 1. f. 6. 
Patella pellucida. Pennant , pi. 93. f. 4, left hand mid¬ 
dle, audiower fig .—Dorset Cat. pi. 23. f. 6 \ 
Patella cterulea. Montagu, Suppl. p. 152. 
Shell oval, rather thick and nearly opake, smooth, or 
faintly ribbed longitudinally and finely striate concentrically, 
sometimes flattish with the crown near the margin, and 
sometimes rather conical with the crown more central, 
often marked with rays of blucish red or brown, which are 
sometimes von* few in number, but frequently surrounding 
die whole shell: color varying from blackish-brown tq 
reddish or pale horn-color : crown obtuse, with mostly an 
impressed circular line a little below the tip, giving it the 
appearance of having a smaller shell placed on the top of 
the larger; inside opalaceous, reflecting various shades of 
white blue purple or red, especially about the margin which 
is generally thick : diameter about an inch. 
Variety. With a bluck spot on each side of thg crown. 
Patella bimaculata. Montagu, pi. 13. f. 8 . 
It has often been a matter of surprise to us, that these 
mo last species should have been consolidated into one $ 
as in no single instance have we been able to discover the 
slightest trace of approximation or transfer from the P. pel- 
iucida into this last, by age or any accidental circumstance, 
either in general appearance, color, consistence, formation 
2*3 of 
