126 ‘EOCENE MOLLUSCA. 
tending the length of the siphonal region ; hinge-area narrow, with a small pit for the 
connector. 
Length, } inch; height, 2ths of an inch. 
Locality. Bracklesham (/dwards). 
A single specimen is in the cabinet of Mr. Edwards; it is the only one I 
have seen, and, judging from the ‘figure and copious description given by M. Deshayes, 
I feel no hesitation in referring it to this elegant species. I agree fully in opinion 
with M. Deshayes that it is quite distinct from Zeda striata of the Paris Basin, 
and it is still further removed from what has been called Leda striata from our own 
deposits. 
The siphonilateral margin of our shell is more rounded and less pointed than that of 
L. striata, and it corresponds in that character both with Z. oblata and L. amygdaloides ; 
but it differs from the former in being entirely covered with ridges, and in being also 
more equilateral ; and from the young of the latter in having the ridges much larger and 
more distant, and in being comparatively shorter. ‘The dental margin is very narrow, 
and is furnished with about a dozen denticles on each side of the cartilaginous pit, which 
is also comparatively small; the shell is thin, and the muscle-mark on the siphonal side is 
large ; the external ridges are visible in the interior: Shell nacreous. 
3. Lepa Gaugortiana, Wyst. Tab. XVII, fig. 2, a, 0. 
Nucuta mucronata. Galeotti. Mém. Const. Géol. Prov. de Brabant, p. 155, No. 123, 
1837. 
a _ Nyst. Coq. Foss. de Belg., p. 223, pl. 18, fig. 3, 1844. 
— serRaTA. J. Sow. in Dixon’s Geol. of Sussex, pp. 93, 170, pl. 2, fig. 9, 1850. 
Lepa Gatnorrmana. D’Orb. Prod. de Paléont., t. ii, p. 378, No. 808, 1850. 
= — Desh. An. sans Vert. du Bass. de Par., t. i, p. 830, pl. 66, figs. 1—3, 
1858. 
— serrata. Morris. Catal. Brit. Foss., p. 206, 1854. 
Spec. Char. L. testd minimd, depressd, ovato-lanceolatd, subequilaterali, pedi-regione 
ovato-rotundatd, siphoni-regione rostrato-acuminatd ; concentricé striata vel costatd ; striis 
paucis, magnis, elevatis ; lunuld lanceolatd paulo excavatd ; ano magno, bipartito ; wmbo- 
nibus depressis ; marginibus integris. 
Shell small, depressed, elongately ovate, nearly equilateral; pedal region ovately 
rounded ; siphonal region angularly pointed ; covered with a small number of elevated ridges 
or lines of growth; lunule elongated and somewhat shallow; beaks depressed, margins 
smooth. 
Length, + inch ; height, ith inch. 
Locality. Bracklesham (dwards). 
