OF SOUTHERN INDIA. 393 
almost coriaceous, thickened on the edge, and covering the greater portion of the 
shell; the foot is oblong, with a lateral, crenulated fringe. 
5 g. A peculiar subgeneric type appears to be represented by the Fissurella 
Nystiana, Ryckholt, from the Turonien beds of Montignies-sur-Roc (Belgium). 
The shell is conically elevated, like a Punctwrella, ornamented with radiating, rather 
thick ribs; the apex is subcentral, pointed and curved anteriorly, with a small, 
circular opening below it. 
6. Pupillia, Gray, 1840. Shell depressed, thin, almost smooth, foramen 
oblong, very large, subcentral, margin of the aperture with a sharp edge. The 
mantle of Pupillia covers the shell entirely. ‘The only species known is P. 
apertura, Born. 
7. Macrochisma, Swains., 1840. Shell oblong, depressed, rather thick, surface 
usually radiated with lines, subtruncate in front, foramen very elongated and 
anterior. There are about 12 recent and a few tertiary species known. 
Comparing the fossil species of the Frssurzzzrp# with the recent ones, it is 
very remarkable to notice that, while the Hmarginula-forms appear to be decreas- 
ing, the Fisswrella-forms are increasing in number, the former being comparatively 
much less rare in fossil state than the latter. The contrary appears to be the case 
with the recent Fisswrel/a, of which (including the subgeneric forms which we 
have quoted) about 180 species are known, while those of Hmarginula and allied 
genera are not more than 70 or 80. 
Pictet and Campiche (Pal. Suisse, 3me. ser., pp. 708-712) catalogue 47 species of Lmarginula 
and 9 species of Fissurel/a from cretaceous deposits. 
To the number of Lmarginula, quoted in Pictet and Campiche’s list, the following have to be 
added: Hmarg. conica, Dewalcquii, radiata, Hoeveni, depressa, clypeata, Kapfi of Binkhorst (Gast. 
et Ceph. craie de Limbourg, 1861, pp. 55-58 and p. 82), and Hm. radiata, Gabb (Pal. Calif. I, 
1864, p. 140, ete., non idem, Binkhorst). Guéranger (Album paléont. de la Sarthe, 1867, pl. XIV,) 
gives figures of the following species, previously named in his Repertoire of 1853, Hm. nodosa 
Cenomanensis, striata,* compressa and granulosa. The previously named Em. pseudoreticulata is 
here omitted, but Hm. conica (an idem, Binkhorst?!) is newly added. A single species of Zmar- 
ginula occurs in our South Indian cretaceous deposits, but strangely enough not a single species 
of any of the other genera belonging to this family has as yet been found. 
IT may mention that Pictet and some other paleontologists also refer Belle- 
rophon and Bellerophina to the Frssvretzzp%, though I rather think that these 
genera belong more probably to the Hrtreropopa,+ or to the OPISTHOBRANCHIA. 
From cretaceous rocks the only known species is Bellerophina minuta, Sow., sp. 
(= B. Vibrayei, V@Orb,). A. Adams described some time ago a recent species of 
Bellerophina from the Japan seas. 
* Probably identical with Hm. pelagica, Passy. 
+ It is remarkable to notice how very much some of the species of Bellerophon resemble those of 
Argonauta, and it is after all not improbable that the animals of Bellerophon were true Cephalopoda. 
oO 
cs) 
