MODIOLA. 99 
closely related to M. subsimplex, but seems to differ in being less convex between 
the umbo 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. 
Distribution.—Perna-bed and Crackers of Atherfield. Atherfield Beds of Seven- 
oaks. Upper Greensand of Devizes. Gault of Folkestone, Black Ven. and 
Okeford Fitzpaine. ? Greensand of Blackdown. 
Moprona FLAGELLIFERA, Forbes, 1846. Plate XVII, figs. 1, 2. 
? 1842. Inocreramus srtiqua, P. Mathéron. Catal. Foss. Bouches-du-Rhone, p. 174, 
pl. xxv, fig. 6. 
1846. Myrinus (Moprouvs) FLAGELLIFERUS. E. Forbes. Trans. Geol. Soc., ser. 2, 
vol. vii, p. 152, pl. xvi, fig. 9. 
1850. Mrrynus FLAGELLiFERvs, A. d’Orbigny. Prodr. de Pal., vol. ii, p. 247. 
? 1863. Myrinus (Moprotus) FLaceniirervs, D. Stur. Jahrb. d. k.-k. geol. 
Reichsanst., vol. xili, p. 55. 
1866. Moprona ruaceniirera, K. A. Zittel. Die Bivaly. d. Gosaugeb. (Denkschr. 
d. k. Akad. der Wissensch. Math-nat. Classe, 
vol. xxv), pt. 2, p. 82 (p. 6 of reprint), pl. xii, 
fir, 2. 
1867, — FLAGELLIFERUS, I’, J. Pictet and G. Campiche. Foss. Terr, Crét. 
Ste. Croix (Matér. Pal. Suisse, ser. 4), p. 513. 
1871. _ FLAGELLIFERA, F. Stoliczka. Pal. Indica, Cret. Fauna S. India, 
p. 379, pl. xxiv, figs. 1, 2. 
? 1873. Myriius (Moprona) FrraGELLirera. H. B. Geinitz. Das Elbthalgeb. in 
Sachsen (Palwontographica, vol. xx), pt. 2, p. 55, 
pl. xv, fig. 5. 
1897. Moprona FLAGELLIFERA, A. Fritsch. Stud. im Geb. der béhm. Kreidef. vi, 
Die Chlomek. Schicht., 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, 
