100 CRETACEOUS LAMELLIBRANCHIA. 
Measurements : 
(1) (2) 
Leneth . A ; 5 : ; : 3. @¢ 102mm, 
Height . ; : F ; : ' 5 2) Pg 
(1) and (2) from Devizes. 
Affinities —This species belongs to a section of Modiola characteristic of the 
Jurassic rocks, of which M. Somwerbiana (dOrbigny) [= M. plicata, Sowerby ], 
M. perplicata (Etallon), M. Medus (VOrbigny), and M. icawnensis (de Loriol) are 
well-known representatives. 
I have seen only three English examples, and these, although in the form of in- 
ternal casts, seem to agree perfectly with the types of MW. flagellifera, Forbes (from 
Pondicherry), with which I have compared them. Zittel has referred to this species 
a form found in the Gosau Beds, of which I have seen one specimen collected by 
Mr. H. Kynaston from Finstergraben, and now preserved in the Woodwardian 
Museum; this also agrees with the Forbes’ types. 
The specimen figured by Mathéron as Inoceramus siliqua is probably an imper- 
fect example of this species. Modiola Gillieroni (Pictet and Campiche),’ from the 
Valangian of Presle (near Bienne) and Cinquétral, appears to differ from M. jlagel- 
lifera in having fewer ribs dorsally, and in the general absence of bifurcation as 
they curve on approaching the carina. 
M. Baini, Sharpe,’ from Sunday River (South Africa), apparently differs from 
M. flagelliferau m haying the ribs continued ventral to the carina, and perhaps also 
in having a more elongate shell. 
M. Ebrayi, de Loriol,’ is probably another related form, but at present is im- 
perfectly known. 
Types.—From the Valudayoor Group of Pondicherry, preserved in the Museum 
of the Geological Society of London (No. 10631); these are also figured by 
Stoliczka. 
Distribution —Upper Greensand of Devizes and Black Ven. 
Mopiona unputata (Forbes). Plate XVII, fig. 3. 
1845. CypricarpiA? unpuata, H. Forbes. Quart. Journ. Geol. Soe., vol. i, 
p. 242, pl. ii, fig. 1. 
1848. Cypricarpia unpuLaATA, H. G. Bronn. Index Paleont., vol. i, p. 387. 
1 “oss. Terr. Crét. Ste. Croix” (‘Mater. Pal. Suisse,’ ser. 4), 1867, p. 503, pl. cxxniil, 
figs. 9, 10. 
2 «Trans. Geol. Soc.,’ ser. 2, vol. vii (1856), p. 193, pl. xxii, figs. 2, 3. 
% “Paune du Gault de Cosne”’ (‘Mém. Soe. Pal. Suisse,’ vol. ix, 1882), p. 80, pl. ix, figs. 18—20 
(especially fig. 20). 
