112 _ EOCENE MOLLUSCA. 
Fig. 3 in ‘Min. Conch.’ is more angulated than fig. 4, but I think they both belong 
to the same species, as there is considerable variation in the outline among Mr. Wetherell’s 
specimens. 
7. N. curvara, Hdwards, MS. Tab. XVIII, fig. 12, a, 4. 
Spec. Char. NV. testa transversd, ovato-subtrigonuld, tumidiusculd, crassiusculd, obsolete 
radiatd, radits vel striis tenuissimis ; valde inequilaterali ; pedi-regione angulatd, productd ; 
ano-regione brevi, in medio prominenti ; margine dorsali sub-rectd ; margine ventrali con- 
ventusculd ; lunuld lanceolatd via conspicud ; marginibus crenulatis. 
Shell transverse, ovately trigonular, slightly tumid, and moderately thick ; obsoletely 
radiated with very fine lines or strize; pedal region produced and angulated; anal region 
short, and rather prominent in the centre; dorsal margin nearly straight, ventral margin 
curved ; lunule scarcely conspicuous, 1aargins crenulated. 
Length, *ths of an inch. 
Locality. Clarendon (#dwards). 
This species is at present very rare. It somewhat resembles WV. sphenoides, but it 
is comparatively longer ; it is more produced and angular at the pedilateral margin, and 
it is less tumid than the Upper Eocene shell. 
Two or three specimens in Mr. Prestwich’s cabinet, obtained from a boring for an 
Artesian well at Southampton, appear to belong to this species; the age of the bed from 
which they came is not stated. 
8. Nucuta Dixoni, Hdwards, MS. Tab. XVIII, fig. 7, a—c. 
Nucuta simruis. J. Sow., in Dixon’s Geol. of Suss., p. 93, t. 2, fig. 7, 1850. 
Spec. Char. N. testé ovato-subtrigonuld, turgidd, lavigatd, valdé inequilateral, 
convexd ; siphoni-regione truncata ; lunuldé obtuse angulatd vie perspicud ; cardine crassa, 
dentibus magnis ; fossuld conneatis elongata ; marginibus crenulatis. 
Shell ovately triangular, somewhat tumid, smooth, convex, very inequilateral ; stphonal 
region truncated; lunule and corselet not very distinctly defined; teeth thick and broad 
towards the connector, margins crenulated. 
Length, *ths of an inch; height, Mths of an inch. 
Localities. Bracklesham, Stubbington, Whitecliff Bay (Zdwards). 
This species is by no means rare at Bracklesham. It appears to differ from sémi/is in 
being more tumid and less angular, and rather more elongated, and it has not the projecting 
pointedness at the basal margin of the siphonal region which is characteristic of that species. 
‘The exterior is more convex, and the radiating lines are less distinct in this than they are 
