102 CRETACEOUS LAMELLIBRANCHIA. 



Family— ASTARTID^, Gray. 



Genus — Astaete, ./. Sowerby, 1810. 



(' Min. Conch.,' vol. ii, p. 85.) 



Astaete elongata, d'Orbigny, 1844. Plate XIV, figs. 2a, b, 3. 



1842. Astarte oblongata, Deshayes in A. Leymerie. Mem. Soc. geol. de France, 



ser. 2, vol. v, pp. 5, 24, pi. vi, fig. 1 

 (non oblonga, Sowerby, 1826). 

 1844. — elongata, A. d'Orbigny. Pal. Franc. Terr. Oct., vol. iii, p. 68, pi. 



cclxiii, figs. 8 — 11. 

 1850. — d'Orbigny. Prodr. de Pal., vol. ii, p. 77. 



1855. — — 0, Cotteau. Moll. Foss. de l'Yonne, p. 69. 



1866. F. J. Pictet and G. Campiche. Foss. Terr. Cre't. Ste. 



Croix (Mater. Pal. Suisse, ser. 

 4), p. 310, pi. cxxiv, figs. 8, 9. 

 1868. — P. de Loriol. Valangien d'Arzier, p. 28, pi. ii, fig. 7. 



1871. F. Stoliczka. Palaeont. Indica, Cret. Fauna S. India, 



vol. iii, p. 285. 

 1900. — A. Wollemamt. Die Biv. u. Gastrop. d. deutscli. u. hol- 



land. Neocoms (Abhandl. d. k. 

 preussiscli. geol. Land., N. F., pt. 

 31), p. 102. 



Description. — Shell thick, elongate, rounded-oblong or oval, convex, compressed, 

 very inequilateral. Postero-dorsal margin curving ventrally to join the obtuse 

 and slightly curving posterior margin. Postero-ventral extremity rounded. Ven- 

 tral margin nearly straight. Anterior margin rounded. Umbones small, with an 

 indistinct keel passing from them towards the postero-ventral extremity. Lunule 

 narrow. 



Ornamentation consists of strong concentric ribs, somewhat unequal in size, and 

 separated by narrow grooves. Margins of valves crenulated. 



Length 21 mm. ; height 22 mm. 



Affinities. — Astarte cingulata, Geinitz, 1 from the Cenomanian of Plauen, is 

 probably identical with this species. 



A. elongata is easily distinguished from other Cretaceous species by its elongate 

 form. 



Remarks. — The only specimens seen are in the Museum of Practical Geology. 



1 'Das Elbthalgeb. in Sachsen ' (Palseonlographica, vol. xx, pt. i, 1873), p. 226, pi. I, fig. 8. Non 

 .1. cingulata, Contejean, 'Kimmcrid. de Montbeliard' (1859), p. 267, pi. xi, figs. 5 — 7. 



