BIVALVIA. 49 
2. Lima Expansa, J. Sowerby. ‘Tab. XI, fig. 6. 
Lima eExpansa. J. Sow. in Dixon’s Geol. of Sussex, pp. 94, 172, t. 3, fig. 34, 1850. 
— — Morris. Cat. Brit. Fossils, p. 172, 1854, 
Spec. Char. L. testa parvd, oblique orbiculari, subtransversd, tenui, fragili, subequi- 
lateral, depressiusculd ; extus striis radiantibus ornatis, interstitiis punctatis ; cardine brevi, 
auriculis minimis, subaequalibus. 
Shell small, obliquely orbicular, slightly transverse, thin, fragile, and subequilateral ; 
externally ornamented with about 40 rays, interstices punctated ; hinge short, with small, 
nearly equal auricles. 
Diameter, + of an inch. 
Locality. Bracklesham (/dwards). 
“ Much more orbicular than any other Zzma I know, but much too oblique for a Pecten. 
It is extremely rare. Mr. Edwards has one nearly perfect valve, and Mr. Dixon a fragment.” 
(Sowerby.) 
This small shell somewhat resembles in outline Z. dilatata, Desh. Coq. foss. de Par., 
p- 298, pl. xl, figs. 15—17. Our shell has about 40—42 rays, which are broad and flat, the 
interspaces narrow, and prettily ornamented with transverse projecting ridges, between which 
are rounded and deep punctations. The hinge-area in Mr. Edwards’ specimen is broken 
and not very distinct ; it was probably small, with small auricles. 
3. Lrva soror, S. Wood. Tab. XI, fig. 7, a, 6. 
Lima oBiiqua. Morris. Catal. Brit. Foss., p. 172, 1854. 
Spec. Char. L. testd ovato-clongatd, obliqua, inequilaterali, tenut, striatd, pedi-regione 
levigatd ; striis angulatis, trregularibus ; umbonibus parvis, acutis; auriculis minimis, 
brevibus, equalibus. 
Shell ovately elongate, oblique, inequilateral, thin, striated, with small angular and 
irregular ribs or riblets ; beaks small and pointed, auricles short and equal. 
Longest diameter, ?ths of an inch. 
Locality. Uighcliff, Barton (4dwards). 
There are two specimens of this species in Mr. Edwards’ cabinet, and they are in a 
sufficiently perfect condition to show a considerable, and what I presume is a specific, 
difference from Z. obliqua of Deshayes, if I may judge from figures and descriptions of 
that shell. 
7 
