118 PHOLADID.E. 



been unable to remove, and the passage is partially ob- 

 structed by it. The immature shell (which Turton 

 described and figured as Pholas lamellata) is not unlike 

 the young of Pholas crispata ; but it is more expanded 

 breadthwise, and the sculpture is much finer. This form 

 can always be traced in the earlier lines of growth of 

 every adult specimen. 



The Pholas papyraceus of Solander is only known to 

 us by Spengler's quotation ; it probably was the young 

 of P. crispata. Turton, in his ' Conchological Diction- 

 ary/ first indicated the present species, and stated that 

 Dr. Goodall had given it the name of Pholadidea Los- 

 combiana ; but in his ' Conchylia Dithyra ' he retained 

 it in Pholas, and altered the specific name to papyracea, 

 on the authority of the sale catalogue of the Portland 

 Museum. In this catalogue occurs " Pholas pypyraceus 

 S/ J without any further particulars. I think the name 

 proposed by Dr. Goodall ought therefore to stand ; but 

 I hesitate to restore it, because the other name, papy- 

 racea, is generally recognized. Blainville called the 

 present species Pholadidea Goodallii; and in Griffith 

 and Pidgeon's edition of Cuvier's ' Regne Animal 9 it 

 bears the fearful name of Pholadidoides Anglicanus, 

 which, however, is matched by one in Leach's ' Mollusca 

 of Great Britain/ viz. Cadmusia Solanderia. 



Genus III. XYLO'PHAGA*, Turton. PL IV. f. 3. 



Body globular, all but the tubes, which, according to Dr. 

 Landsborough, are not included within the shell : mantle 

 puckered around the sides of the foot : tubes slender, covered 

 by a single sheath, very extensile, marked lengthwise with 



* Wood -eating. 



