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EOCENE MOLLUSCA. 



12. Cyrena tellinella, Ferussac. Tab. A, fig. 13 a — c. 



Cyrena tellinella, Fer. Hist, des Moll. Terrest. Eluv., tab. sans No., fig. 1, 1819. 



— — Desk. Coq. Toss, des Env. de Par., p. 123, pi. xix, figs. 18, 19, 



1824. 



— — — An. s. Vert, du Bas. de Par., p. 507, pi. xxxviii, figs. 3,4, 



1860. 



— — J. Lowry. Chart Brit. Tert. Foss., pi. iv, 1866. 



— — Sandberger. Land- und Sussw.-Conch., p. 1 79, t. viii, fig. 5, 1 870. 



Spec. Char. C. " Testa ovato-elongatd, transversa, inaquilaterali, Icevigatd, depressd; 

 umbonibus minimis ; dentibus cardinalibus minimis, duobus in utrdque valvd, lateralibus 

 magnis, oblique striatis" {Desk.) 



Length, 1 inch ; height, \ an inch. 



Localities. Britain : Charlton (S. Wood), Woolwich, Upnor, New Cross {Morris). 

 France : Lignites, pres Epernay. 



This species is of a marked character, and well distinguished from all others of this 

 genus met with in England ; and its peculiarly elongated form has even been considered 

 as a sufficient distinction to entitle it to be proposed as a new genus under the name of 

 Loxoptgchodon, but I think that character alone is insufficient for generic removal. The 

 hinge is strong, with three cardinal teeth, of which the central one is bifid. There are 

 also two lateral teeth, of which that on the posterior side is very elongated and some- 

 what remote, and both of them rugose or striated, the nymph or fulcrum for the external 

 connector being sharp, long, and slightly prominent. The species was abundant at 

 Charlton. M. Deshayes has described and figured two varieties of this species, one 

 somewhat larger than the other, and also larger than any specimen that I have seen 

 from our English beds. 



This species is given by M. Deshayes as from the " Sables moyens " in France, as 

 well as from the " Lignites." I have seen the British specimens only from Woolwich and 

 Charlton. 



13. Cyrena semistriata, Deshayes. Tab. B, fig. 1 a, b. 



Cyrena semistriata, Desk. Ency. Method. Vers., t. xi, p. 52, No. 17, 1830. 



— — Id. An. sans Vert, du Bas. de Par., p. 511, pi. xxxvi, figs. 



21, 22, 1860. 



_ _ Nyst. Coq. Foss. de Belg., p. 143, tab. vii, fig. 3, 1843. 



— — Morris. Mem. Geol. Surv. (Isle of Wight,), p. 146, pi. ii, figs. 



1, 2, 1856. 



— — Sandberger. Land- und Sussw.-Conch., p. 309, tab. xx, fig. 



2 a, b, 1872. 



