J. 8S. GARDNER ON BRITISH CRETACEOUS NUCULID. 189 , 
possible manner. It is more regular in outline, however, and the 
inferior margin is less sinuous. Prof. Forbes called attention to the 
omission by D’Orbigny of any reference to the striz, which occupy 
precisely the same position as in the Gault species, leaving the two 
extremities smooth. My own specimens from Atherfield are small, 
but singularly well preserved. Mr. Meyer has also some larger 
though imperfect specimens ; there is a shell from Speeton in the 
British Museum; and I have it from near Hunstanton. A well- 
preserved series might possibly reveal further slight differences, 
though it is quite obvious that L. Warie, L. angulata, and L. scapha 
are merely slight modifications of a single true species, and present an 
instance in which the necessity for a trinomial terminology becomes 
especially apparent. 
Its presence at Atherfield has been recorded by Profs. Forbes, 
Fitton, and Morris. 
Neocomian Species. 
LepA sPATHULATA, Forbes, Quart. Journ. Geol. Soc. vol. i. p. 245, 
pl. 3 fig. 4 (1845). Plate V. figs. 30-34. 
This species seems to be intermediate between L. scapha and L. 
solea of the Gault. Itis somewhat large, elongated, with the poste- 
rior extremity obtusely rounded, and slightly produced or rostrated 
anteriorly. The shell is thin and finely striated and compressed. 
D’Orbigny identified it with an Aptian species, L. lingulata, but 
this appears to have been wider posteriorly and to have tapered 
towards the beak, more as in ZL. solea. Pictet mentions specimens 
far exceeding ours in size, and reaching a length of 25 millim. 
It seems by no means a rare shell, and is mentioned by both Forbes 
and Fitton as occurring at Atherfield. Mr. Meyer has some singu- 
larly well-preserved specimens from the Atherfield beds of Sevenoaks, 
and others from the Perna Bed of East Shalford and from Shanklin. 
The Leckenby collection in the Woodwardian Museum contains it 
from Speeton ; and it was met with in abundance in a quarry near 
Hunstanton by members of the Geologists’ Association. Specimens 
from the Folkestone Beds near Nutfield, belonging to Mr. Meyer, 
almost indicate the presence there of another species, L. lingulata of 
D’Orbigny. A specimen from Speeton in the British Museum bears 
the MS. name L. pandata. 
Gault Species. 
Lepa sozza, d’Orb., sp., Pal. Franc., Terr. Crét. vol. i. p. 170, pl. 304, 
figs. 4-6 (1843). Plate III. fig. 30. 
This is by far the most elongated type of Cretaceous Lede, and 
possesses a very thin glossy shell of a brownish colour. It is skiff- 
shaped, the inferior margin is slightly sinuous, the posterior region 
short, with an irregularly rounded margin, the anterior prolonged 
into a rostrum, with sharply truncated extremity, and a slight ridge 
running diagonally from the umbo to the lower corner of the trun- 
cated end. The whole surface is marked with exceedingly fine 
