8 CONq^Xl^lA—Dll^aXftA. 1. 



#^ Valvis medio indivisis. 5-8. 

 l^e valves not divided by a groove. 



Dactylus Pholas testd oblongo-ovatd, latere antico hiantissimo rostrato, 

 margine postico rejlexo celbdoso, acces&orits quatuor. 

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

 anterior end, the back margin reflected and divided into cells, 

 with four accessorial valves. 

 Pholas Dactylus. JLinn. Syst. Nat. p. lllO, 

 "" '■' Gmel. Syst. p. 3214. 



Turton, Linn. Syst. iv. p. 172. 

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

 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. 

 JLinn. Trans, viii. p- 30. 

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

 Dillvoyn, Descript. Catal. p. 35. 

 Turton, Conch. Diet. p. 143. 

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

 Pholas striatus. iis^er. 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 imme- 

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



