612 
Transactions of the Society. 
superior face. Inferior face excavated at the umbilicus, periphery- 
rounded, slightly lobulated ; sutures sunk. Aperture circular, with an 
everted margin. Shell smooth and translucent. Length 0*25 mm. 
This interesting little form is widely distributed in the Malay 
Archipelago, and is by no means rare. It differs from F. Rhodiensis 
in the inflation of the chambers, in the lesser exposure of the con- 
volutions on the inferior face of the test, and in the form of the 
aperture. 
Sub-Family Peneroplidinse. 
Cornuspira Schultze. 
Cornuspira foliacea Philippi sp. 
Orbis foliaceus Philippi, 1844, Enum. Moll. Siciliae, vol. ii. p. 147, 
pi. xxiv. fig. 26. Cornuspira foliacea (Phil.) Balkwill and Wright, 
1885, Trans. E. Irish Acad., vol. xxviii. p. 326, pi. xii. fig. 1. 
C. foliacea (Phil.) Egger, 1893, Abhandl. k. bayer. Akad. Wiss., 
Cl. IL, vol. xviii. p. 247, pi. iii. figs. 20, 21. C. foliacea (Phil.) For- 
nasini, 1893, Mem. E. Accad. Sci. 1st. Bologna, ser. 5, vol. iii. p. 431, 
pi. i. fig. 4. C. foliacea (Phil.) Goes, 1894. K. Svenska Vet.-Akad. 
Handl., vol. xxv. p. 106, pi. xviii. fig. 834. C. foliacea (Phil.) 
Morton, 1897, Proc. Portland Soc. Nat. Hist., vol. ii. p. 114, pi. i. 
fig. 16. 
Although tolerably abundant and widely diffused, the specimens 
are feeble, none of them exhibiting the rapid increase in size of the 
outer convolution which is characteristic of the species. 
Cornuspira involvens Eeuss. 
Operculina involvens Eeuss, 1850, Denkschr. k. Akad. Wiss. 
Wien, vol. i. p. 370, pi. xlvi. fig. 20. Cornuspira involvens Eeuss, 
1863, Sitzber. k. Akad. Wiss. Wien, vol. xlviii. p. 39, pi. i. fig. 2. 
C. involvens (Eeuss) Balkwill and Wright, 1885, Trans. E. Irish 
Acad., vol. xxviii. p. 327, pi. xii. fig. 2. C. involvens (Eeuss) Brady, 
Parker, and Jones, 1888, Trans/, Zool. Soc., vol. xii. p. 216, pi. xl. 
figs. 1-3. C. involvens (Eeuss) Sherborn and Chapman, 1889, Journ. 
E. Micr. Soc., p. 484, pi. xi. figs. 4, 5. C. cretacea (Eeuss) Burrows, 
Sherborn, and Bailey, 1890, Journ. E. Micr. Soc., p. 552, pi. viii. fig. 6. 
C. involvens (Eeuss) Egger, 1893, Abhandl. k. bayer. Akad. Wiss., 
Cl. II., vol. xviii. p. 246, pi. iii. figs. 18, 19. C. involvens (Eeuss) 
T. Eupert Jones, 1895, Pal. Soc., p. 128, pi. iii. figs. 52-54 and 
woodcuts figs. 11 a, 11 b. 
Is more abundant than C. foliacea, and occurs in two forms ; in one 
of these the tube is very small at the commencement, and the convo- 
lutions numerous ; in the other the whorls are few, and the tube, 
having its origin in a spherical chamber, increases but little in size. 
This latter is the more abundant. 
Probably these represent the Microspheric and Megalospheric 
