18 EOCENE MOLLUSC A. 



numerous shells united under the name of Bellovacina in the lower London Tertiaries 

 belonged to more than one species. I had hoped to have been able to assign to these their 

 respective localities, of which not less than twenty are recorded ; Mr. Prestwich fears 

 that, without a re-examination of the ground, this cannot be satisfactorily done. 



The costse in the upper valve of our shell are visible in most of the specimens found at 

 Woolwich ; these may also be observed in some from Beauvais, although in the generality of 

 specimens from this latter locality they are obsolete. Tab. VII, fig. 3, b, has the upper 

 valve quite free from these radiations, while in Tab. VII, fig. 3, c, another specimen from 

 the same locality, they are very distinct. Differences quite as great, or even greater, may be 

 observed in specimens of 0. edulis. M. Hebert considers the shell from Kleyn-Spauwen, 

 figured under this name, to be a different species, and says (Bull, de la Soc. Geol., 1848-9, 

 p. 469, No. 7) that he has examined only the upper valve, and that this presents sufficient 

 differences to entitle it to be specifically removed from Bellovacina ; having seen only 

 one valve, he refrains from giving it a new name. The shell represented by M. Nyst has 

 distinct radiations upon the upper valve, but the muscle -mark seems rather more rounded 

 than in the British fossil, which is reniform and somewhat pointed ; the same may be said 

 of the figure of the muscle- mark given by M. Deshayes from the Paris Basin ; in a 

 specimen I have from Beauvais, the muscle-mark precisely resembles those in the 

 Woolwich specimens. I believe them to be the same species. 



Philippi introduces this name as a fossil from Palermo, but he gives no figure, only a 

 description, and this so short that it might be adapted to other species. In the Museum 

 of the Geological Society is a specimen from Gibraltar much resembling our shell, but I 

 think it is distinct ; it has rather larger radiations, and these are more foliaceous. Sir 

 Charles Lyell gives the name of Bellovacina to an Ostrea found in limestone at the 

 " Grove," about seventeen miles north of Charleston, in South Carolina, ' Proc. Geol. 

 Soc. Lond.,' February, 1845, p. 567, and I have seen a specimen, in Sir Charles's cabinet, 

 from Virginia (without a name), which, in some characters, resembles 0. pulchra ; I can 

 scarcely think it strictly identical either with it or with Bellovacina. 



4. Ostrea callifera, Lamarck. Tab. V, fig. 1, a, b. 



Ostrea callifera. Lam. Hist, des An. sans Vert., t. vi, p. 218, No. 19, 1822. 



— — Desk. Coq. Foss. des Env. de Par., t. 1, p. 399, pi. 50, fig. 1 ; and 



pi. 51, figs. 1, 2, 1824—37. 



— — Id. An. sans Vert, du Bassin de Par., t. 1, p. 110, 1860. 



_ _ Gold/. Pet. Germ., vol. ii, p. 27, No. 71, pi. 83, fig. 2, d—f, 1833. 



_ _ ? tfyst. Coq. Foss. de Belg., p. 317, pi. 29, fig. 1, a, 1843. 



— — Bronn. Lethsea Geogn., t. 39, fig. 14, 1836. 



_ _ Forbes. Mem. Geol. Surv., 1856, pp. 46—145, pi. 1, figs. 5, 5, a. 



— hippopus? Lam. Loc. cit. sup., t. via, p. 159, No. 2, 1806 (non Iiippo-pus recens). 



Spec. Char. 0. testa ovatd, line prope basim callo crasso subauritd ; valvd majore 



