MODIOLA. 99 



closely related to M. sahsimplex, but seems to differ in being less convex between 

 the nmbo and the posterior extremity, and in having the ventral margin straighter 

 and the posterior more rounded. 



Types. — The type comes from the Neocomian of Ville-sur-Terre. The specimen 

 referred to by Forbes is in the Museum of the Geological Society. The specimen 

 figured by Newton is in the British Museum. 



DUtrihut'lon. — Perna-he(\. and Crackers of Atherfield. Atherfield Beds of Seven- 

 oaks, Upper Greensand of Devizes. Gault of Folkestone, Black Ven, and 

 Okeford Fitzpaine. ? Greensand of Blackdown. 



MoDioLA FLAGELLiFEEA, Fovhes, 1846. Plate XVII, figs. 1, 2. 



? 1842. Inoceramus fiiijiqvA, P. Mathemn. Catal. Foss. Bonches-du-Rhone, p. 174, 



pi. XXV, fig. 6. 

 1846. Mytilus (Modiolus) flagelliperus. E. Forbes. Trans. Geol. Soc, ser. 2, 



vol. vii, p. 152, pi. xvi, fig. 9. 

 1850. MiTTLUS FLAGELLiFERUS, A. d'Orhiguy. Prodr. de Pal., vol. ii, p. 247. 

 ? 1863. Mytilus (Modiolus) flagelliferus, D. Stur. Jahrb. d. k.-k. geol. 



Reichsanst., vol. xiii, p. 55. 



1866. Modiola flagellifera, K. A. Ziffcl. Die Bivalv. d. Grosaiigeb. (Denksehr. 



d. k. Akad. der Wissenscli. Matli-nat. Classe, 

 vol. xxv), pt. 2, p. 82 (p. 6 of reprint), pi. xii, 

 fig. 2. 



1867. — flagelliferus, F. J. Pidet a/ul G. Cnmjiiche. Foss. Terr. Crct. 



Ste. Croix (Mater. Pal. Suisse, ser. 4), p. 513. 

 1871. — flagellifera, F. Stoliczka. Pal. Indica, Cret. Fauna S. India, 



p. 379, pi. xxiv, figs. 1, 2. 

 ? 1873. Mytilus (Modiola) flagellifera. H. B. Gelnitz. Das Elbthalgeb. in 



Sachsen (Palseontograpliica, vol. xx), pt. 2, p. 55, 

 pi. XV, fig. 5. 

 1897. Modiola flagellifera, A. Fritfich. Stud, im Greb. der bolim. Kreidef. vi. 



Die Chloniek. Scliicht., p. 59, fig. 69. 



Description. — Shell very elongate, slightly curved, compressed, with knife-like 

 edges ; somewhat enlarged posteriorly. Dorsal margin almost straight, and nearly 

 parallel with the slightly concave ventral margin. Umbones obtuse, nearly terminal, 

 with a faintly marked oblique carina extending to the postero-ventral extremity. 

 Ornamentation consists of flagelliform ribs, which are broad near the dorsal margin, 

 and are directed obliquely backwards. At about half their length they curve 

 rapidly, diminish in size, bifurcate, and often have smaller ribs intercalated : the 

 ribs taper at the carina, ventral to which the shell is marked with growth-lines 

 only, or is nearly smooth. 



