BIVALVIA. 67 
7. Moproua FLABELLULA, S. Wood. ‘Tab. XIII, fig. 9, a—c. 
Spec. Char. M. testd tenui, clongata, irregulariter trapeziformi ; pedi-regione pared, 
brevi; siphoni-regione elongata et latiore ; radiato-costulatd, costulis magnis, depressis, ali- 
quando dichotomis ; margine ventrali subsinuato, 
Shell thin, elongate, irregularly trapeziform ; pedal region small and short; siphonal 
region elongate and broader; radiately rayed with broad, depressed ribs or riblets, which 
sometimes divide or bifurcate; ventral margin slightly curved. 
Length, \ inch. 
Locality. Wempstead (Hdwards). 
‘Three specimens of this shell have lately come into the possession of Mr. Edwards, and 
I think they are entitled to be considered as belonging to a distinct species. The shell is 
different from JZ. nodulifera in its more elongated form and in the radiations not being 
noduliferous. 47. pectinata, Lamarck, approaches it in some characters, but the outline is 
different, and that shell has more numerous radiations. 
8. Mopiota nastata, Deshayes. Tab. XII, fig. 6, a, 6. 
Mopiora uastata. Desh. Coq. Foss. des Envy. de Par., t. 1, p. 361, pl. 38, figs. 13, 14, 
1824. 
— — Id. An. sans Vert. du Bassin de Par., t. ii, p. 13, 1860. 
— ELEGANS. J. Sow., in Dixon’s Geol. of Suss., p. 94, pl. 44, fig. 13, 1850. 
Myrizus mastatus. Desh. Ency. Méthod. Vers., t. ii, p. 563, 1830. 
Spec. Char. M. testd ovato-elongatd, subulata, valde recurva ; dorso oblique angulated ; 
striaté ; striis divaricatis, spatio mediano levigalo ; pedi-regione brevi, profunde crenulatda. 
Shell ovately elongate, tapering, greatly recurved; dorsal margin obliquely angular ; 
striated striz divaricating; central space smooth; pedal region short, pointed; margin 
deeply crenulated. , 
Length, 14 meh. 
Localities. Brook (Zdwards), Bognor. 
There is a considerable curvature in the ventral margin of this species, and the shell 
is elevated into an obtuse keel curving from the umbo; in these characters it differs 
from MW. elegans, and it appears to be identical with the Paris basin species. The whole 
of the siphonal region is deeply and coarsely striated; these striae bifurcate towards the 
siphoni-lateral margin, and extend a little over the obtuse keel or ridge, beyond which 
they immediately become finer, and are soon lost in the naked ventral region. ‘The 
pedal region is very small, angular, or obtusely pointed, and on the margin of this are a 
few coarse, radiating striz or ridges. ‘The ventral region is strongly marked with lines of 
growth. 
