536 II. B. Brady — Fossil Foraminlfera of Sumatra. 



Orhitoides papyracea, Giimbel, 1868, Abb. d. II. CI. Akad. "Wissensch. 

 Miincben, vol. x. pt. 2. p. 690, pi. 8, fig. 1. 



Tbe nomenclature of tbis species, better known to English pakeon- 

 tologists as Orhitoides Pratti and 0. Fortisii, bas been worked out 

 witb great minuteness by Dr. Giimbel, and to bis paper on tbe North- 

 Alpine Eocene Foraminifera (op. cit.), from wbicb the above refer- 

 ences are taken, tbe reader may be directed for its full synonymy. 



Tbe Sumatran specimens call for but little comment. Their 

 general external appearance is shown in PI. XIV. Figs. 1, a, b; the 

 nearly median horizontal section is given in Fig. 1 c, and the 

 transverse section in Fig. d. The largest of Heer Verbeek's examples 

 bas a diameter of T 6 o of an inch (15 mm.), and a thickness, at the 

 centre, of about -| inch (3-5 mm.) ; but most of them are propor- 

 tionately thinner than the above fractions indicate, and as very few 

 of them attain even these dimensions, they may be regarded as 

 somewhat small examples of the species. Figs, a and b represent 

 fair average specimens, magnified five diameters ; the drawings of 

 internal structure, c and d, are on a higher scale, namely 20 diameters. 



Locality — Coral-limestone, Padang Highlands, West-Coast District, 

 Sumatra. 



6. Orbitoides dispansa (Sowerby). PL XIV. Figs. 2, a, b, c. 



Lycophris dispansus, J. de C. Sowerby, 1836, Trans. Geol. Soc, 

 2 ser. vol. v. p. 327, pi. 24, figs. 15, 16. 



Lycophris (Orhitoides) dispansus, Carter, 1853, Journ. Bombay 

 Asiat. Soc, vol. v. p. 126, pi. 2, figs. 23-29. 



Orhitoides dispansa, D'Arch. et Haime, 1S54, Descr. An. foss. 

 Groupe numm. de ITnde, p. 349. 



Orhitoides dispansa, Giimbel, 1868, Abh. d. II. CI. Akad. Wissensch. 

 Miincben, vol. x. pt. 2, p. 701, pi. 3, figs. 40-47. 



A few specimens of a small, thick, lenticular Orhitoides, with 

 tuberculate surface (PL XIV. Figs. 2, a, b, c), may with confidence be 

 assigned to 0. dispansa, a species best known as one of tbe impor- 

 tant fossil constituents of the Tertiary rocks of Scinde, and more 

 recently found in the Eocene beds of southern Germany and of Italy. 



Heer Verbeek's specimens are small ; somewhat less than \ inch 

 (6 mm.) in diameter, and T ' T inch (2 mm.) in thickness. Many of 

 them have both surfaces not merely granulate, which is a common 

 condition, but studded with large prominent tubercles, as shown in 

 the figure. Beyond this they seem to offer no points of peculiarity ; 

 but the specimens altogether present much greater variety of external 

 contour than those of 0. papyracea. 



Localities — Orbitoidal Limestone, Bockit Poangang, Sumatra, and 

 tbe Marl-rock of Nias Island. 



7. Orbitoides Sumatrensis, sp. nov. PL XIV. Figs. 3, a, b, c. 

 There are still some two or three little fossils pertaining to the 



genus Orhitoides, very different in shape and proportionate dimen- 

 sions from either of the foregoing. One of these is represented in 

 PL XIV. Figs. 3, a, b. They are sub -globular or only slightly com- 



