H. B. Brady — Fossil Foraminif era of Sumatra. 535 



North Africa and Asia ; indeed almost wherever the early Tertiary 

 Nummulitic strata appear, N. Bamondi seems to be present. 



Locality— -The Nias Limestone, of late Tertiary age, with Num- 

 mulites and Corals. 



4. Numbiuxista Eamondi, Tar. Verbeekiana, nov. PI. XIII. 

 Figs. 5, a, b, c. 



In the collection of Nunimulites are a few examples somewhat 

 smaller than the foregoing, also from the Tertiary limestone of the 

 Island of Nias. In general external characters they are very similar 

 to N. Bamondi, but they differ considerably in interior structure. 

 The best specimen is that figured in PL XIII. Fig. 5, a ; but the 

 drawing, though accurate up to the magnifying power employed, is a 

 little ambiguous. By the abrasion of the outer laminae in places, 

 an appearance like that of the lobulate segments of Amphistegina 

 is produced ; the fact being that the septal lines of some of the 

 inner convolutions are laid bare near the periphery, and these 

 happen to be set more obliquely than those of the outermost 

 whorl, so that the latter appear in the drawing to be suddenly 

 reflexed at a short distance from the margin. The radiating septal 

 lines, however, are in reality not continuous, as they appear in 

 the figure ; and with a higher magnifying power and carefully 

 adjusted light the portions near the periphery — that is, the oblique. 

 or reflexed ends of the radii — are seen to belong to the penultimate 

 or even an earlier convolution. The horizontal section, Fig. 5 b, 

 is clearly the section of a Nummulite, not of an AmpMstegina. 



The distinctions between this variety and what may be regarded 

 as the typical N. Bamondi consist, firstly, in the smaller number of 

 segments in each convolution, and, secondly, in their greater obliquity 

 and curvature. The largest specimen has a diameter of about T ' T inch 

 (2-5 mm.), and is somewhat thick and umbonate. Average examples 

 appear to have from five to six convolutions ; the sixth with about 

 twenty-six segments. It has been found impossible to ascertain, 

 accurately anything about the primordial chamber, all the central 

 portions of the tests being obscured by the obliterating nature of the 

 mineral infiltration. 



Under the circumstances we can perhaps scarcely do better than 

 distinguish the Nummulite under notice as a variety, naming it 

 Verbeekiana, after Heer Verbeek. 



Locality — Coralline Limestone of Nias Island. 



5. Orbitoides papyracea (Boubee). PI. XIV. Figs. 1, a, b, c, d. 

 Niimmidites papyracea, Boubee, 1S32, Bull. Soc. geol. France, 



vol. ii. p. 445. 

 Orbitolites Pratti, Michelin, 1840-1847, Icon, zooph. p. 278, pi. 63, 



fig. 14. 

 Orbitolites Fortisii, D'Archiac, 1850, Hist. Progr. Geol. vol. iii. 



p. 230. — Mem. Soc. geol. France, 2 ser. vol. v. p. 404, pi. 8, 



fiffs. 10-12. 



