118 PHOLADID.E. 



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

 structed by it. The immature sliell (which Turton 

 described and figured as Pholas lameUata) is not unlike 

 the young of Pholas crispata ; but it is more expanded 

 breadthwise, and the sculptui-e 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.'^ without any further particulars. I think the name 

 proposed by Dr. Goodall ought therefore to stand j 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 ' it 

 bears the fearful name of Pholadidoides Anglicanus, 

 which, however, is matched by one in Leaches ^ 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. 



