82 f PHOLAS. 



figure of this shell, who has given an excellent repre- 

 sentation of the interior, in his Hist. Anim. Angl. 

 Gmelin has described the shell again in p. 3228, under 

 the name of Solen crispus, with a reference to Lister, 

 and the following query, An distincta satis hujus generis 

 species? 



SMALL PIERCE-STONE. 



6. Pholas parva. Ph. testa ovali, hinc reticulato-striata, cardinis dentr 



ex tuherculo orto. Linn. Trans. 8. p. 33. 

 Shell oval with reticulate striae at one end ; hinge with a tooth springing 



from a tubercle. 

 Penn. Brit. Zool. ed. 1812. pi. 43. f. 1. Mont. Test. Brit. p. 22. t. 1. 



f. 7, 8. 



This is evidently a distinct species, rescued from a 

 state of uncertainty by Mr. Montagu. It has been con- 

 founded both with the Ph. Dactt/his, and Ph. crispatus, 

 but chiefly with the latter; it differs however from both. 

 " From the former," says Mr. Montagu, " it may be 

 readily known by not having any cells on the reflected 

 margin of the hinge ; from the latter in not having the 

 longitudinal furrow ; and from both by the knob at the 

 base of the tooth." 



The author is in possession of a specimen an inch 

 and a half broad, in which the above observations are 

 confirmed, with this addition, that the margin near the 

 beak, or narrow end, projects at a right angle with the 

 shell, and is indented beneath. 



The Pholas parvus, which Donovan has figured in 

 pi. 69, is certainly a young shell of the Ph. crispata. 



