WORMS. TESTACEA 45. Pecten. 161- 



little truncate, within white with a plain margin : beak nearly 

 central, incurved. 



285. A. No<z. Rhombic, reticulate, notched at top: beak 

 near one end, incurved, very remote, separated by a 

 deep groove. 



Donov. t. 153. Montague tab \.f. 3. 



Shell about half an inch broad, rufous brown, much gaping at 

 the beaks and margin, a little truncate at both ends, within 

 whitish, crenate on the outer margin.- 



286. A. mimda. Oblong, produced at one end into an an- 

 gular truncate indented beak, rounded at the other. 



Donov. t. 78. A. caudatu. Walk, min. sh.f. 81. A. Modiolus. 



Shell 4 lines long, hardly half an inch broad, white or yellow- 

 ish, finely striate transversely, with 3 4 strong excentric ridges, 

 closed: beak small, turning a little towards the angular side. 



287. A. Nucleus. Sub triangular, produced at one end, 

 concentrically wrinkled and crossed with minute 

 obsolete striae, white, within silvery. 



Donovan t. 63. Linn. Trans. 6. t. i8./". 3-6. 



Shelly lines long, a little more broad, covered with a glofsy 

 olive skin : beak oblique, under which is a heart-shaped cleprefsi- 

 on : , ; i.-:-sc angular, with regular pectinate teeth each side : narj/v 

 crenulate within. 



45. PECTEN. Scallop. 



28S. P. maximus. Ears of equal size : shell with about 

 14 rounded ribs which are longitudinally grooved. 



Br. ZooL t. 59*y. 61. Donov. t. 49. Ca Cost. t. g.f, 3. 



Shell 5 inches long, 6 broad ; the upper-valve tlat, transversely 

 striate between the ribs, rufous ; lower-valve very concave, yel- 

 lowiih-white ; within whitish, rufous round the margin: ears- 

 large, rectangular, with decufsate striae. 



289. P. Jacobaus. Ears equal: shell with about 17 

 angular ribs which are longitudinally grooved. 



Br. Zool. t. 60. /. 62; Doriov. tsbi 137. 



Shelly inches long, 5 broad ; the upper valve a little convev, 

 rufous; the lower white; transversely stuate, within white, a 

 little tinged at the margin : ears rectangular, with decussate 

 strias. 



290. P. opercularis. Ears nearly equal: shell with 

 about 20 rounded ribs finely striate longitudinally 

 and transversely. 



Br. Zool. t. 6c.f. 63. Donov. t. iz. P. subrufus. 



Shelf nearly orbicular, about 2 inches and a half wide, gene- 

 rally beautifully variegated while red purple or brown, the, 

 upper-valve rather convex : ears rather unequal, With decussate 

 striae, ciliate. 



291* P. lineatus. Ears a little unequal : shell with about 

 18 narrow rougli ribs r white with a purple line 

 down each of the ribs on the ~pper- valve. 



Donov. t. 116. Da Costa tab; iQ.f. **. 



Shell about an inch. and a half long, hardly as much broad, 

 white with. a. purple line down each of the ribs of the upper- 

 valve, lower-valve pure white, transversely striate : ears net 

 quite equal, striate. 



292. P. Pusio. Ears nearly equal : shell equivalve 3 

 mostly distorted, with about 40 linear ribs, 



Br, Zool. tab. 6i,/. 65, Donovan tab. 34, 



