PLATE XXXIII. 
Fig. 1. PECTEN oPERcuLARis. 
Pbcten opercularis, Lam. Syst. vi. p. 172. — Mont. Test. Brit. p. 145. 
Ostrea opercularisj Brown in Ency. Brit. vi. p. 418. 
Fig. 2. PECTEN lineatus. 
Pecten lineatus. Lam. Syst. vi. p. 172. — Mont. Test. Brit. p. 147- 
Ostrea lineata, Brown in Ency. Brit. vi. p. 418. 
Fig. 3. PECTEN IsLANDicus. 
Pecten Islandicus, Lam. Syst. vi. p. 174. 
Ostrea cinnabarina. Brown in Ency. Brit. vi. p. 418. — First discovered as a British Shell by Miss Julia Trevelyanof 
Wallington, Northumberland. Found on the beach near Ardencaple, opposite Roseneath. In Mr Trevelyan's 
Cabinet, and also in Lady Jardine's. 
Fig. 4. PECTEN vARius. 
Pecten varius. Lam. Syst. vi. p. 175. — Mont. Test. Brit. p. 146. 
Ostrea varia. Brown in Ency. Brit. vi. p. 418. 
Fig. 5. PECTEN Jacobjeus. 
Pbcten Jacobaeus, Lam. Syst. vi. p. 165. — Mont. Test. Brit. p. 144. 
Ostrea Jacobaeus, Brown in Ency. Brit. vi. p. 417- 
Fig. 6. PECTEN obsoletus. 
Pecten obsoletus, Mont. Test. Brit. p. 149. 
Pecten parvus, Penn. Brit. Zool. iv. p. 153, No. 7- 
Ostrea obsoleta. Brown in Ency. Brit. vi. p. 418. 
Fig, 7. PECTEN L^vis. 
Pecten laevis, Mont. Test. Brit. p. 150, pi. 4, f. 4. 
Ostrea laevis, Brown in Ency. Brit. vi. p. 418. 
Fig. 8. PECTEN spiNosus. 
Pecten spinosus. Brown's MSS. — A New Species, which is not uncommon on the Northumberland coast, parti- 
cularly at the Herd Sands, South Shields, and was found at Seaton by W. C. Trevelyan, Esq. 
