92 CRETACEOUS LAMELLIBRANCHIA. 
1852. Myrinus rornacensis, P. de Ryckholt. Mélanges Paldéont., pt. 1 (Mém. 
cour. et Mém. des Sav. é¢trangers vol. xxiv), 
p. 150, pl. ix, fig. 7. 
1871. — — F. Stoliczka. Palewont. Indica, Cret. Fauna S. India 
vol, ili, p. 374. 
1883. Moprona, sp. nov., W. Keeping. Foss., &c., Neoc., Upware and Brickhill, 
p. 118. 
Remarks.—A single specimen described, but not named, by W. Keeping agrees 
closely with M. tornacensis, @Archiac. The greater part of the shell has unfortu- 
nately disappeared except ventrally to the carina, where the characteristic crimp- 
like ornamentation is seen, but is rather finer than in Belgian specimens. 
D’Orbigny' and some other authors have considered M. tornacensis to be 
identical with M. Galliennei, dOrbigny, but the two forms seem to me quite distinct. 
The former (of which I have one specimen from 'Tournay, sent me by M. Piret, and 
also figures of a specimen in the Brussels Museum, kindly made by M. Rutot) is 
distinguished from the latter by (1) the more prominent, ridge-like, regular growth- 
lines ;* (2) the presence of the crimp-lke ornamentation near the dorsal margin as 
well as ventrally; (3) the less pointed umbonal region; (4) the curvature of the 
carina. [am doubtful whether this species should be referred to Mytilus. 
Type.—From the Tourtia of Tournay. 
Distribution.—Lower Greensand of Upware. 
Genus—Moptona, Lamarck, 1799. 
(‘Mém. Soc. Hist. Nat. Paris,’ p. 87.) 
Moptona mquaris, Sowerby, 1818. Plate XV, figs. 8a—e, 9—14. 
1818. Moprona mauatts, J. Sowerby. Min. Conch., vol. iii, p. 18, pl. cex, fig. 2. 
? 1842. — Brpartira, A. Leymerie. Mém. Soc. géol. France, vol. v, p. 26, 
pl. ix, fig. 8 (non bipartita, Sowerby). 
1844. Myrinus mquauts, A. d’Orbigny. Pal. Frane. Terr. Crét., vol. ui, p. 265, 
pl. ecexxxvii, figs. 3, 4. 
1845. — (Moprouvs) mauauis, FE. Forbes. Quart. Journ. Geol. Soc., vol. i, 
p. 248. 
1850. —_ mQuarts, A. d’Orbigny. Prodr. de Pal., vol. ii, p. 81. 
1854. Moprona mquauis, J. Morris. Cat. Brit. Foss., ed. 2, p. 210. 
1855. Myritus mquauis, G. Cotteauw. Moll. Foss. de lYonne, p. 93. 
1 «Prod. de Pal.,’ vol. ii (1850), p. 165. 
* In this respect d’Archiac’s fig. 3 is not satisfactory; it was probably drawn from a worn 
specimen, 
