126 SOLEN. 



trically; two faint lines, without colour, diverge, in a 

 slight degree, from the hinge to the margin. The 

 shell gapes considerably at both ends; it is white 

 within, and has two erect teeth in one valve, receiving 

 one between them from the opposite side. These teeth, 

 however, are so deciduous, that we seldom meet with a 

 shell quite perfect. It is one inch long, or from hinge 

 to margin, and two inches broad. 



This, which is the S. coarctatus of Gmelin, is a rare 

 species, and was first figured by Pennant, who found it 

 at Weymouth. Mr. Montagu mentions it from Looe in 

 Cornwall. 



BRITTLE RAZOR. 

 PL 29. /. 4, 5. Dr. Coombe. 



11. Solen fragilis. S. testa ovali-oblonga, tenui, alba, epidermide obscure 

 viridescente superinduta, cardine altero bidentato. 



Shell oblong-oval, thin, white, and covered with a dark greenish epider- 

 mis ; hinge with two teeth in one valve. 



Chem. Conch. 11. pi. 198. f. 1939. (Solen bidens). Pult. in Hutch. 

 Dorset, pi. 4. f. 5. 



A thin, delicate, white shell, covered with a strong 

 green epidermis, except about the hinge, which is in 

 most specimens quite bare. In the middle it is some- 

 what depressed, and is rounded at both ends. The 

 principal characteristic is a strong red line, which 

 passes from the hinge towards the margin, declining in 

 colour as it proceeds. In the specimen under notice, 

 faint indications of two other lines, which are perfectly 

 white, may be perceived, in one valve, diverging from 

 the same point. The inside is white, and the hinge, 

 which is placed in the middle of the shell, has two teeth 

 on one side, and one on the other. 



