136 PATELLA. LIMPET. 
larly striate. On the rocks between the Pigeon-house and the 
light-house, in Dublin bay, is a fine variety, exactly answer¬ 
ing to the Patella ccerulea of Linne, being of a blackish co- 
lor on the outside, with numerous unequal striae, and the 
margin slightly jagged ; the inside of an uniform rich iri¬ 
descent blue; its diameter and elevation about an inch and 
•a half ; and no other variety is found on the same spot. 
A Adhering to rocks and stones, v. v. 
; 4. Patella intorta. Tubercled Limpet. 
Pennant , pi. 93. f. 2— Donovan, pi. 146. 
Shell oval, convex, semitransparent, rufous-brown, with 
more than twenty equidistant tubercled ribs and alternate 
smaller ones, some of the tubercles nearly black: crown 
near one end, often worn fiat, and turning downwards ; in- 
side pale rufous-brown, with the circumference oblong and 
the margin slightly indented by the ribs: length three- 
quarters of an inch ; breadth about half an inch j height 
less. 
Western coast, and North Britain: rare. v. m. 
5. Patella vii'ginca. Rayed Limpet. 
Dorset Cat. pi. 14. f. 11. 
Patella par va. Donovan, pi. 21. f . 2 — Da Costa, pi 6. 
f. 11. 
Shell thin, nearly transparent, oval, a little obliquely co¬ 
me, blueish-grey or horn-color tinged with purple, often 
covered with a dark skin, very obscurely ribbed longitudi¬ 
nally and wrinkled transversely, marked with purplish-red 
lines radiating from the crown to the margin; these rays 
are broader or narrower, sometimes undulate, or running 
into each other in a chain-like manner, often visible only at 
the margin, but mostly so on the inside: crown placednear 
the margin, obtusely pointed, and generally pale or green¬ 
ish at the tip, and leaning a little towards the .shorter side; 
inside smooth, glossy, purplish, with the margin obscurely 
indented : length three-eighths of an inch; breadth a quar¬ 
ter of an inch ; height hardly as much. 
Dead shells become white, with only the traces of two 
lines near the beak, placed like the letter V inverted. 
Adhering to F uci: v, v , 
6 . Patella 
