$ CONCH YLI A— D/THyi?^. 1. 



** Valvis medio indivisis. 5. 8. 

 The valves not divided by a groove. 



Dftctylus Pholas testd oblongo-ovatd, latere antico hiantissimo rostrato, mar- 

 gine postico rejlexo celluloso, accessoriis quatuor. 

 Shell oval-oblong, very open and produced into a beak at the anter- 

 ior end, the back margin reflected and divided into cells, with 

 four accessorial valves. 

 Pholas Dactylus. Linn. Syst. Nat. p. 1110. 

 • Gmel. Syst. p. 3214. 



Turton, Linn. Syst. iv. p. 172 

 Pennant, Brit. Zool. iv. p. 156, tab. 42, fig. 1. 

 Chemnitz,, viii. p. 353, tab. 101, fig. 859. 

 Montagu, Test. Brit. p. 20 and 558. 

 Donovan, Brit. Shells iv. tab. 118 

 Turton, British Fauna, p. 145. 

 Dorset Catal. p. 27, tab. 3, fig 2. 

 Linn Trans, viii. p. 30. 

 Wood, Conch, p. 77, tab. 13, fig. 1 to 3 

 Dillwyn, Descript. Catal.. p. 35. 

 Turton, Conch. Diet. p. 143. 

 Pholas muricatus. Da Costa, Brit. Conch, p. 244, tab. 16 fig. 2. 

 Pholas striatus. Lister, Conch, tab. 433, fig. 276, and Append. 



tab. 19, fig. 1 and 2. 

 Mus. nost. Inhabits rocks and submarine stumps of trees. 



The most common of our British species, and may be immedi- 

 ately distinguished by the cells, which are placed in a trans- 



