﻿14 



EOCENE MOLLUSCA. 



In the Catalogue of Species from Hordle Cliff which I gave in that Journal, p. 118, I 

 observed that this species and two others of Deshayes, obliqua {obliquata) and cycladi- 

 formis, were merely varieties of one species. I have, however, thought that it would be 

 productive of less confusion, and facilitate the comparison of the French and English 

 Eocenes, to adhere to Mr. Deshayes' specific determinations, more especially as my 

 specimens appear to correspond with his figures and descriptions, and I have therefore 

 done so. 



Fig. 6 a, b represents a small and not well- determined species, of which Mr. Morris 

 seemed doubtful when he figured it in the ' Memoirs of the Geol. Survey ' by Forbes, as 

 Cyrena gibbosula, PI. vi, fig. 13. I have not seen the specimen, but have had the figure 

 copied. It looks like a deformed specimen of C. deperdita. 



18. Cyrena pisum, Deshayes. Tab. B, fig. 12 a, b. 



Cyrena pisum, Desk. Desc. des Coq. Foss. des Env. de Par., p. 117, pi. xix, 

 figs. 10—13, 1824. 

 _ _ S.Wood. Lond. Geol. Journ., p. 118, 1847. 



Spec. Char. " C. Testa minima, subtrigond, globidosd, lavigatd ; umbonibus inflatis, 

 productioribus, obliquis ; dentibus cardinalibus tribus, in altera binis, lateralibus sub- 

 tequalibus admotis lavigatis." (Des/t.) 



Length, Y§ths °f an i ncn ; height, ^th of an inch. 



Localities. Britain : Hordle (S. Wood). 

 France : Houdan. 



This shell is by no means rare in the sandy deposit at Hordle. It is difficult to 

 separate it from deperdita, but that shell is more transverse, and not quite so tumid. 



19. Cyrena cycladiformis, Deshayes. Tab. B, fig. 11 a, b. 



Cyrena cycladiformis, Desk. Coq. Foss. des Env. de Par., vol. i, p. 121, t. xix^ 

 figs. 7—9, 1824. 



_ _ Wood. Lond. Geol. Journ., p. 18, 1847. 



_ _ Morris. Catal. Brit. Foss., 2nd edit., p. 200, 1854. 



— — Sandberger. Land-Conch., p. 208, t. xi, fig. 3, 1872. 



Spec. Char. " C. Testa ovatd, transversa, sub <z quit aterali, Icevigatd, tenuis fragili ; 

 umbonibus minimis ; dentibus cardinalibus tribus valvd dextrd ; duobusin altera, posticalibas 

 bijidis ; dentibus lateralibus lamellosis, minimis lavigatis." (Desh.) 



