298 MOLLUSCA FROM THE CRAG. 



sidering this as the connecting link between the Pholas and the Teredo ; and it may be 

 further remarked, that the habit of closing its anterior opening, when the animal has 

 attained to full maturity, is very analogous to the closing of the anterior portion of the 

 tube in the adult or senile species in the Teredo and other tube-forming Bivalves. 



Pholades have been found fossil as early as the Lias, and, as it might be supposed, 

 were present in the Tertiary Formations. One species, in the Paris Basin, forms a 

 calcareous lining to its burrow. 



Pholadidea papyracea, Solander. Tab. XXX, fig. 10. 



Pholas papyracea. Solander, MSS., fide Turton. Portland Cat., p. 82, lot 1828. 



— — Turt. Brit. Biv., p. 2, pi. 1, figs. 1—4, 1822. 



— — G. Sow. Gen. of Shells, No. 24, fig. 3. 



— — Reeve. Conch. Syst., pi. 24, fig. 3. 

 Pholadidea Goodallii. Diet, des Sc. Nat., t. 37, p. 532. 



— striata. Cuv. An. Kingd. (edit. Griffith), pi. 8, fig. 1. 



— lamellata. Turt. Brit. Biv., p. 4, pi. 1, figs. 5, 6. 



— Loscombiana. Goodall in Turt. Conch. Diet., p. 147, 1819. 



— papyracea. Forb. and Hani. Brit. Moll., vol. i, p. 123, pi. 5, figs. 3—6. 



— — Gray. List Brit. Moll., p. 52, 1851. 



Spec. Char. "P. testa clavatd, latere antico clauso obtusissimo, postico hiante truncato 

 accessorio producto annulari." 



" Shell club-shaped, closed and very obtuse at the anterior end, open and truncate 

 at the other end, which is furnished with a produced accessorial ring." — Turton. 



Length, \\ inch. Height, -| inch. 



Locality. Cor. Crag, Sutton. Recent, South Coast of Britain. 



A few fragments, in my cabinet, indicate so strong a resemblance to the recent 

 British shell, that I do not hesitate to refer them to that species. One piece has the 

 obtuse anterior extremity, with the smooth surface of the enclosed portion of the gape 

 peculiar to the adult shell ; while two fragments of the siphonal side are truncated, and 

 marked with concentric lines like the recent species, without any radiating ridges. 

 They are, however, unfit for description ; and I have therefore copied the diagnosis 

 from Turton. 



Teredo,* Linnaus, 1767. 



Teredo. Sellius, 1732. Adamson, 1757. 

 Sipiionium. Brown, 1756. 

 Serpula (sp.) Linn. Schroet. 

 Uperotus (sp.) Guettard, 1774. 

 Xylovhagus. Gronov. 1781. 



Teuedarius. .Dumeril, 180G. 

 Septaria. Lunik. 1818. 

 Xylotrya. Leach, MS. 1817. 

 Bankia. Gray, 1840. 

 Malleolus. Gray, 1848. 



* Etym. repnhwv, Pliny, a repj/w, to bore. 



