CYPRIMKRIA. 183 



'I'lipc. — From Blackdown ; in the British Museiiin. 



Disfribittioii. — Upper (Treensixnd (zone of SrJilonihachia rosfrafd) of Bhickdown 

 and Haldon. Recorded by Barrois from the Upper Greensand of Liilwortli, and 

 by Jukes-Browne from the Upper Greensand of the Isle of Wight. 



Genus — ("yimmmeria, T. A. Conrad, 18G4. 



(•Proc. Acad. Nat. Sci. Philad.,' 18G4, p. 212, aud ' Amer. Journ. Couch.,' vol. ii, ]8CS, p. 102. 

 Stoliczka, ' I'alieout. ludica, Cret. Fauna S. lu.lia,' 187li, p. 157.)' 



Suh-ffeniis — Cyclorisma, IF. //. Dall, 1903. 



('Proc. U.S. Nat. Mus.,' vol. x.xvi, 1903, p. 357. Syu. CyclothyrU, T. A. Conrad in W. C. Keir's 

 'Geol. Rep. N. Carolina," vol. i, Appendi.K 1 (1875), p. 8. Non CyclotJiyris, M'Coy, 1844.) 



CYri(iMKi;i.\ (Cvclouisma) vectensis (Forhrs), 1845. Plate XXVIH, tigs. 11—18. 



1845. Venus vectensis, E. Forbes. Quart. Journ. Geol. See, vol. i, p. 240, pi. ii, 



fig. 4. 

 18.50. — — A.iVOrhiiiny. Prodr. de Pal, vol. ii, p. 118. 



1854. — — ./. Morrh. Cat. Brit. Poss., ed. 2, p. 231. 



1805. — — F.J. Firtrl and a. Campiche. Foss. Terr. Cn't. Ste. 



Croix (Mater. Pal. Suisse, .ser. 4), 

 p. 188. 

 1870. — F. Stoliczka. Palteout. Indica, Cret. Fauna S. India, 



vol. iii, p. 160. 

 ? 1883. — — W. Keejjiiuj. Foss., etc. Neoc. Upwaro and Brickhill, 



p. 125. 



])p!<n-ipfi(in. — Shell oval, or nearly orbicular, a little longer than high, regularly 

 convex, slightly or moderately inecjuilateral. Margin rounded. L'nibones small, 

 pointed, somewhat curved forwards. Lunule indistinct, not impressed, limited by a 

 Faint line. Pallia! sinus angiilar, directed upwards. Margins of valves smooth. 

 Surface of shell smooth except for small, inconspicuous, concentric ridges, and 

 occasional growth-rings. 



Hinge : In the riglit valve an anterior and a median cardinal and two posterior 

 laminar teeth (which together represent the posterior cardinal) diverge from 

 under the umbo; the anterior is directed forwards, the median is nearly vertical, 



' 'i'he following European species are referred by Conrad and In- Stoliczka to the j,'cniis 

 Cyprimeria: C yclina primieva, Zitt., Dosivia cretacea, Zitt., Circe (liKriin (Math.), Circf cohciiiIiIch, 

 Zitt., and AreoiHKjiii rotinidnf/i, d'Orb. Holzapfel figures Cypriiiirri'i (ieinHzi (Midi.) and C. motiela, 

 Holz., from the Aachen Greensand. 



