298 MOLLUSCA FROM THE CRAG. 
sidering this as the connecting link between the Pholas and the Zeredo ; 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 Zeredo 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. 
PHouas papyracea. Solander, MSS., fide Turton. Portland Cat., p. 82, lot 1828. 
—_ — Turt. Brit. Biv., p. 2, pl. 1, figs. 1—4, 1822. 
— — G. Sow. Gen. of Shells, No. 24, fig. 3. 
— — Reeve. Conch. Syst., pl. 24, fig. 3. 
PuotapipEa Goopatuit. Dict. des Se. Nat., t. 37, p. 532. 
—- striata. Cuv. An. Kingd. (edit. Griffith), pl. 8, fig. 1. 
— LAMELLATA. Turt. Brit. Biy., p. 4, pl. 1, figs. 5, 6. 
— LoscomBiaNA. Goodall in Turt. Conch. Dict., p- 147, 1819. 
— PAPYRACEA. orb, and Hani. Brit. Moll., vol. i, p. 123, pl. 5, figs. 3—6. 
_- o Gray. List Brit. Moll., p. 52, 1851. 
Spee. Char. “ P. testé 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.”—TZvrton. 
Length, \z inch. Height, = inch. 
Locahty. 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,* Linneus, 1767. 
TErREDO, Sellius, 1732. Adamson, 1757. Trereparius. Dumeril, 1806. 
Srpnontum. Brown, 1756. Srprarra. Lamk. 1818. 
SERPULA (sp.) Linn. Schriet. XyLotrya. Leach, MS. 1817. 
Urrrorus (sp.) Guettard, 1774. | Banxia. Gray, 1840. 
XyLopuacus. Gronov. 1781. Matieouus. Gray, 1848. 
* Etym. repndwy, Pliny, a repnw, to bore. 
