126 EOCENE MOLLUSC A. 



tending the length of the siplional region ; hinge-area narrow, with a small pit for the 

 connector. 



Length, \ inch ; height, ^ths of an inch. 



Locality. Bracklesham (Edwards). 



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 Leda 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 L. oblata and L. amyydaloides ; 

 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. Leda Galeottiana, Nyst. Tab. XVII, fig. 2, a, b. 



Nucula mucronata. Galeotti. Mem. Const. Geol. Prov. de Brabant, p. 155, No. 123, 

 183/. 



_ _ Nyst. Coq. Foss. de Belg., p. 223, pi. 18, fig. 3, 1844. 



— serrata. J. Sow. in Dixon's Geol. of Sussex, pp. 93, 1/0, pi. 2, fig. 9, 1850. 

 Leda Galeottiana. VOrb. Prod, de Paleont., t. ii, p. 378, No. 808, 1850. 



— — Desk. An. sans Vert, du Bass, de Par., t. i, p. 830, pi. 6G, figs. 1 — 3, 



1858. 



— serrata. Morris. Catal. Brit. Foss., p. 206, 1854. 



Spec. Char. L. testa minima, depressd, ovato-lanceolatd, subcequilaterali, pedi-reyione 

 ovato-rotundatd, siphoni-reyione rostrato-acuminatd ; concentrice striata vel costatd ; striis 

 paucis, maynis, elevatis ; lunula lanceolatd paulo excavatd ; ano mayno, bipartito ; umbo- 

 nibus depressis ; maryinibus inteyris. 



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. 



Lenyth, \ inch ; heiyht, \{\\ inch. 



Locality. Bracklesham (Edwards). 



