56 



CRETACEOUS LAMELLIBRANCHIA. 



them) curve ventrally, and also the form of the shell, seem to connect this species 

 with C. donningtonensis, Keeping (vide supra, p. 54). 



Remarks. — The specific name given by Keeping is preoccupied as shown 

 above, but, since the species is now removed from Pectunculus, the specific name 

 can be retained. 



Types. — The only specimens seen are the types (three in number) from Upware, 

 preserved in the Woodwardian Museum, Cambridge. 



Distribution. — Lower Greensand of Upware. 



2. Upper Cretaceous Species. 

 Cocull^a venusta, Nyst, 1848. Plate XT, figs. 5 a—c, 6 a, b, 7 a, b. 



Cucull^ia Formosa, J. de C. Sowerby. Trans. Geol. Soc, ser. 2, vol. iv, 



p. 342, pi. xvii, fig. 7. 



Arca (Cttccll^a) venusta, H. P. Nyst. Tableau des Especes vivant et 

 foss. des Arcacees (Mem. Acad. Roy. Belg., 

 vol. xxii), p. 76 (nom. mitt.). 



— subfoemosa, A. d'Orbiyny. Prodr. de Pal., vol. ii, p. 164 (nom. mut.). 

 CxrcuLLiEA fobmosa, J. Morris. Cat. Brit. Foss., ed. 2, p. 197. 



Arca (CUCULL.EA) Formosa, F. J. Pictet and G. Campiche. Foss. Terr. Cret. 

 Ste. Croix (Mater. Pal. Suisse, ser. 4), pt. iii, p. 473. 



— subformosa, A. Briart and F. L. Comet. Descript. de la Meule de 



Bracquegnies (Mum. Cour. et des Sav. etrangers,Acad. 

 Roy. Belg., vol. xxxiv), p. 54, pi. v, figs. 11, 12. 



— foumosa, F. Stoliczka. Palspiont. Indica, Cret. Fauna S. India, 



vol. iii, p. 343 (? Triyonoarca). 



1S4S. 



1850. 

 1854. 

 1866. 



? 1868. 



1871. 



Non 1833. Cucull.t.a Formosa, G. B. Sowerby. Proc. Zool. Soc, pt. i, p. 20. (Figured 



Reeve, Conch. Icon., vol. ii, 1844, pi. ii, fig. 10.) 



Measurements : 



(1) (2) (3) 



Length .... 8 .7 .4 mm. 



Height .... 6-5 . 5-5 . 3 „ 

 Bemarlcs. — I have seen only five specimens of this form — three in the Bristol 

 Museum and two belonging to Mr. Meyer. The shell is not well preserved in any 

 case. In form, and the character of the concentric ornamentation, it is near to 

 C. Fittoni (see p. 52), but all five specimens are much smaller. 



G. venusta appears to differ from G. Fittoni in being more convex ; in having 

 the ventral margin less curved posteriorly — so that the postero-ventral angle is 



