41 



at the edges and forming a dorsal covering; the mantle 

 by which they are kept together, allowing of motion, and 

 forming a border round the whole. 



* C. FASCICULARIS. Tart. Lin. Mont. Test. Brit., vol. 

 1, p. 5. Flem. Brit. An., p. 288. Not uncommon, 

 sheltered under stones, or at the roots of the smaller 

 sea-weeds and Corallines. When separate from its resting 

 place, in rolls itself up into a ball; as is the habit also of 

 the other Chitons. 



C. CRINITUS. Turt. Lin. Pen. Brit Zo., vol. 4, pi. 36, 

 fig. 1. Mont. Test. Brit., vol. 1, p. 4. Scarce; but I 

 have found it at Coomb in Lantivet bay, among the roots 

 of sea-weeds 



* C. MARGINATUM. Turt. Lin. Pen. Brit. Zo., vol. 4, 



pi. 36, fig. 2, Mont. Test. Brit., vol. 1, p. 1. Flem. 

 Brit. An., p. 289. Not uncommon. 



* C. RUBER. C. Levis. Turt. Lin. Pen. Brit. Zo., vol. 4. 



pi. 36, fig. 3. Mont. Test. Brit., vol. 1, p. 2. C. R. 

 Flem. Brit. An., p. 289. It is to be observed, that these 

 animals are subject to variation of colour; so that scarcely 

 two specimens of any of the species will be found exactly 

 similar in this' respect. 



* C. CINEREUS. Turt. Lin. Mont. Test. Brit., vol. 1, 

 p. 3. Flem. Brit. An., p. 289. Not uncommon. 



* C. ALBUS. Turt. Lin. Mont. Test. Brit., vol. 1, p. 4. 

 Flem. Brit. An., p. 290. Common, on shells or stones 

 from deep water. 



PATELLA. 

 GENERIC CHARACTER : Shell univalve, flattened co- 

 nical or like a shield, concave and simple below, without 

 fissure on the margin; the summit entire, inclining 

 forward. 



* P. VULGATA. Turt. Lin. Pen. Brit. Zo., vol. 4, pi. 89, 

 fig. 145. Mont. Test. Brit., vol. 2, p. 475. Flem. Brit. 

 An. p. 286. Limpet. Abundant, most so on the east side 

 of the county. They are employed to feed Ducks. 



* P. DEPRESSA. Turt. Lin. Pen. Brit. Zo., vol. 4, pi. 89, 

 fig. 146. Mont. Test. Brit., vol. 2, p. 475. Borlase's Nat. 

 Hist, of Corn., pi. 28, fig. 3. It remains uncertain whether 

 this be a variety of P. Vulgata, or a separate species : 

 Montagu and Fleming inclining to the former, Pennant and 

 Turton to the latter opinion. 



* P. INTORTA. Flem. Brit. An., p. 287. A specimen 



which with doubt, I have assigned to this species, was 

 found near Seaton, east of Looe. It is seven-tenths of an 

 inch in its longest diameter and about six-tenths in height, 

 smooth, conical, the summit not inclined, bearing resem- 

 blance to Pennant's figure of P. (Emarginula) Fissura, but 



G 



