OSTREA. *2G3 



regular, and somewhat lamellated excrescences ; the colour 

 is white, variegated with numerous confluent bright red 

 spots. 



vitrea. 35. Shell sub-orbicular, hyaline, with very 

 fine rays, and minute scaly concentric striae ; 

 margin acute. 



Ostrea vitrea. Gmelin, p. 3328. 



Ostrea, No. 17- Schroeter Einl. iii. p. 329. 



Pecten glaber. Pennant Zool. iv. p. 102. ? Montagu Test. 



p. 150.? 

 Chemnitz, vii. p. 335. t. 67. f. 637 a. 



Inhabits the coasts of .Norway, Iceland, and Greenland. Chem- 

 nitz. 



Shell about three-quarters of an inch long, and almost equally 

 broad ; transparent, very brittle, and of a dirty white or red- 

 dish colour ; the valves are similar, and the auricles are re- 

 presented nearly equal, so that it may probably be the Pec- 

 ten glaher of Pennant; Chemnitz says they are unequal, 

 but then he has obviously blended the following species with 

 it in his specific character. 



obsoleta. 36. Shell sub-orbicular, depressed with 

 about nine obsolete ribs, and crowded longi- 

 tudinal, and very minute transverse striae. 



Ostrea obsoleta. Maton and Packet, in Lin. Trans, viii. 

 p 100. 



Ostrea vitrea, Var. £. Gmelin, p. 3328. 



Ostrea, No. 18. Schroeter Einl. iii. p. 330. 



Pecten obsoletus. Pennant Zool. iv. p. 102. Donovan, 

 i. t. 1. f. 2. Montagu Test. p. 149. 



Pecten parvus. Da Costa Brit. Conch, p. 153. 



Chemnitz, vii. p. 335. t. 67. f. 637, b and c. 

 Inhabits the coasts of Britain. Pennant, fyc. 

 Shell about three-quarters of an inch long, and the length ra- 

 ther exceeds the breadth ; the valves are similar, and rlattish ; 



one of the auricles is much dilated, and the other very small; 



the colour is purplish or reddish, and is sometimes slightly 



marbled with white. 



l^vis. 37. Shell sub-orbicular, depressed, and 

 nearly smooth, with only obsolete concentric 

 wrinkles. 



