136 PATELLA. LIMPET. 



larly striate. On the rocks bet ween the Pigeon-house and the 

 light-house, in Dublin bay, is a fine variety, exactly answer- 

 ing to the Patella caerulea 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. 

 Adhering to rocks and stones, v. v. 



4. Patella intorta. Tubercled Limpet. 



Pennant, pi. 93. f. 2 Donovan, pi. 146. 



Shell oval, convex, semitrans parent, 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 flat, 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 j breadth about half an inch ; height 

 less. 



Western coast, and North Britain : rare. v. m. 



5. Patella virginea. Hayed Limpet. 

 Dorset Cat. pi. 14. f, 11. 



Patella parva. Donovan, pi. 21. f. 2 Da Costa, pi. 3. 



Shell thin, nearly transparent, oval, a little obliquely co- 

 nic, 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 placed near 

 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 Fuci: v, v, 



6. Patelh 



