J. S. GARDNER ON BRITISH CRETACEOUS NUCULIDZ. 135 
ANGULATH PECTINATA. 
Tenet meerorenn Depth es es wee 
mm. mm. mm. 70) j 
J OCU (A rae 18 dab 9 100 f 104° 
N. bivirgata, var. or- | 47 14 19 68 96° 
WAEISSUUE was 100 
Benoit (oi... 80) bun oe BB 100 f 100-105° 
N. pectinata, var. 67 ° 
nie ee j a Han 100 i Se 
ANGULATH LEVIGATH 
. nae 20 enc 
Mutentiquate |... 11 gel” alvzeg 100 f 70 
N. gauliina (largest 80 : 
Specimens) ...... ny : : 100 i io 
Lepa, Schumacher, 1817. 
This genus comprises a number of small, oblong, transverse shells, 
rounded anteriorly, beaked, and sometimes slightly gaping pos- 
teriorly. The hinge is similar to that of Nucula, but the shells are 
not necessarily nacreous, and the margin is always smooth. For 
the purposes of the present notes, the nearly allied genera Voldia, 
&e., are united with it. They comprise the Cretaceous group of 
Nuculide described as “ Rostrate” by D’Orbigny. 
Neoconian Spectes. 
LepA suBREcuRVA, Phillips, sp., Geol. Yorkshire, pl. 2, fig. 11 (1829). 
Plate V. figs. 24—25. 
No description of the species is given by Phillips, and the figure 
is almost too imperfect to enable it to be identified. There can, 
however, be little doubt as to the well-known recurved species of 
the Speeton Clay being intended, though the name has since been 
extended to a distinct Gault species. The shell is very inflated, pro- 
duced anteriorly, with moderately defined lunule, deeply furrowed 
or corrugated except at the extremities, and finely striated. The 
umbones are much further forward than in L. phaseolina, from which 
its greater size, far greater depth, and coarser corrugations also 
suffice to distinguish ib. 
There are casts from Speeton both in the British Museum aad. at 
Cambridge, which are probably of this species, though there is no 
conclusive evidence of this. 
Gault Species. 
Lepa pHAsEoLINA, Michelin, sp., Mém. Soc. Géol. vol. iii. pl. 12, 
fis, 6 (1836). Plate ITI. figs. 22-24; Pl. V. figs. 26-29 ? 
This is a small and rather inflated species, somewhat produced, 
