CYTHERE. 27 



26. Cythere sublacunosa, Jones. 



Cythebe lacunosa, Jones. Monogr. Tert. Entom., 1857, p. 31, pi. iii, figs. 5 a b. 



— sublacunosa, Jones. Geol. Mag., 1870, p. 156. 



The original name for this cannot stand, as another and somewhat similar 

 species has been so called by Reuss. Sublacunosa was proposed in 1870 as a 

 fitting name for the Suffolk species. This form has many allies ; for instance, 

 some recent Norwegian specimens are mentioned in the Monograph (p. 31) as 

 being of the same species ; and these have been referred to by Mr. Brady (who at 

 first thought them to be varieties of Reuss's G. clathrata and lyrata, and 

 Speyer's G. latimarginata) to Sars' C. angulata, abyssicola, and tuberculata (' Trans. 

 Linn. Soc.,' 1868, pp. 406, 409, and letters). (British Museum.) 



27. Cythere latimarginata, Speyer. Plate I, fig. 6. 



Cythebe latimabginata, Speyer. Ostrac. Cassel. Tert., 1 1863, p. 22, pi. iii, fig. 3. 



— abyssicola, G. O. Sars. Overs. Norg. Mar. Ostrac., 2 1865, p. 163. 



— latimabginata, Brady, Orosskey, and Robertson. Monogr. Post-Tert. 



Entom., 1874, p. 163, pi. xvi, fig. 6. 



— — Tr. Zool. Soc., vol. x, p. 389, pi. lxiv, figs. 8 a— d. 



Following Dr. Brady's determination of this species in the papers above men- 

 tioned, we refer this specimen to Speyer's species. The figure in the ' Monogr. 

 Post-Tert. Entom.' comes nearest to our form, but is furthest from Speyer's 

 original figure, to which the figures of the Antwerp-Crag specimens in ' Trans. 

 Zool. Soc.,' 1878, nearly approximate. 



One valve ; White Crag. (British Museum.) 



28. Cythere arenosa, Bosquet. Var. nov. Plate II, figs. 11a, b. 



Cithebe aeenosa, Bosquet. Crust. Foss. Terr. Cret. Limbourg, 3 1854, p. 101, 



pi. vii, figs, la — d; Jones and Sherborn, Geol. 

 Mag., 1887, p. 391, pi. xi, fig. 1. 



This weak variety of Bosquet's species is one of the papulated forms of Cythere, 

 the surface having low, tubercular, and obscure meshes (fig. 11 b), which in other 

 instances form strong tubercles. In some cases these become ragged warts 



1 ' Berieht Ver. Naturkunde Cassel,' 1860-62 (1863), pp. 1—63, pis. i— iv. 



2 ' Forhandl. Videnskabs-Selskabet Christiania,' Aar 1864 (1865). 

 8 'Mem. Commission De-script, et Carte geol. Neerlande,' vol. ii. 



