92 CRETACEOUS LAMELLIBEANCHTA. 



1852. Mttilus tornacensis, P. de Byckholf. Mt'langes Pak'ont., pt. 1 (Mem. 



coiir. et M('m. des Sav. ei rangers vol. xxiv), 

 p. 150, pi. ix, fig. 7. 

 1871. — — F.StoUczka. Palaeont. ludica, Cret. Fauna S. India 



vol. iii, p. 374. 

 1883. MoDiOLA, sp. nov., W. Keeping. Foss., &c., Neoc, Upware andBrickhill, 



p. 118. 



Remarks. — A single specimen described, but not named, by W. Keeping agrees 

 closely with M. tornacensis, d'Arcliiac. 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. foruacensis to be 

 identical with M. GalUennei, d'Orbigny, but the two forms seem tome 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-like ornamentation near the dorsal margin as 

 well as ventrally ; (3) the less pointed umbonal region ; (4) the curvature of the 

 carina. I am doubtful whether this species should be referred to Mytilus. 



Type. — From the Tourtia of Tournay. 



DistrihuHov. — Lower Greensand of Upware. 



Genus — Modiola, Lamarcl', 1799. 

 (' Mem. Soc. Hist. Nat. Paris,' p. 87.) 



MoDiOLA .^QFALTS, Sowprhy, 1 81 8. Plate XV, figs. 8 a — c, 9 — 14. 



1818. Modiola ^.qualis, /. Sowerby. Min. Conch., vol. iii, p. 18, pi. ccx, fig. 2. 

 ? 1842. — BiPARTiTA, A. Leymerie. Mem. Soc. geol. France, vol. v, p. 26, 



pi. ix, fig. 8 (non bipartita, Sowerby). 



1844. Mytilus ^equalis, A. d'Orhigny. Pal. Fran^. Terr. Cret., vol. iii, p. 265, 



pi. cccxxxvii, figs. 3, 4. 



1845. — (Modiolus) .isqualis, E. Forbes. Quart. Journ. Geol. Soc, vol. i, 



p. 248. 

 1850. — ^-QUALis, A. d'Orbigny. Prodr. de Pal., vol. ii, p. 81. 



1854. Modiola iEQUALis, /. Morris. Cat. Brit. Foss., ed. 2, p. 210. 



1855. Mytilus ^qualis, G. Cotteav. Moll. Foss. de I'Yonne, p. 93. 



1 'Prod, de Pal.,' vol. ii (1850), p. 165. 



2 In this respect d'Arcliiac' s fig. 3 is not satisfactory ; it was probably drawn from a worn 

 specimen, 



