H. B. Brady — Fossil Foramlnifera of Sumatra. 537 



pressed, one-eighth, of an inch (3" mm.) in diameter, and about one- 

 tenth of an inch (2-5 mm.) in thickness. The exterior is rough 

 and granular. Laid horizontally, there is an irregular, partial 

 extension of the periphery, which seems to suggest an abortive disc. 

 It is within the bounds of possibility that these specimens may be 

 the central thick portions of some form like the more umbonate 

 varieties of 0. dispansa, but the interior structure does not lend 

 itself to this supposition. The general arrangement of the chamber- 

 lets is shown in Fig. 3 c, which is drawn from a horizontal section 

 near, but not at, the median plane. A transverse section shows 

 the median disc, which does not appear to be quite uniformly 

 central in its position, exceedingly thin in the middle, thickening 

 rapidly towards the circumference, rounded at the margin, and 

 having somewhat the contour, in section, of an hour-glass drawn 

 out a little at the ends. The primordial chamber, as far as can be 

 made out, is very small. Such structural and morphological 

 peculiarities as these do not seem to be in accord with the characters 

 of any published species ; and, notwithstanding a certain amount 

 of doubt, in the absence of sufficient material for complete in- 

 vestigation, as to the degree of relationship that may exist between 

 these sub-globular specimens and 0. dispansa, we have but little 

 hesitation in concluding that they represent an undescribed form, 

 and have named them accordingly. 



Locality — Marl-rock of Nias Island, West Coast of Sumatra. 



8. Fustjlina peinceps (Ehrenberg). PI. XIII. Figs. 6, a-c. 



Borelis princeps, Ehrenb., 1854, Mikrogeologie, pi. xxxvii. figs. 

 x. o, 1-4. See also Monatsberichte d. k. Akad. Berlin, fur 

 1842, p. 273, and 1843, p. 106. 



Fusxdina princeps, Parker and Jones, 1872, Annals N. Hist. ser. 4, 

 vol. x. pp. 257 and 260. 



The genus Fusxdina is of extreme interest to both the Geologist 

 and the Zoologist, — to the former on account of its restricted 

 stratigraphical range and from the important part it has played as a 

 rock-builder ; to the latter from its isomorphism with two other 

 remarkable genera of Foraminifera, namely Alveolina in the 

 " porcellanous," and Loftusia in the "'arenaceous" series. The 

 specimens sent by Heer Verbeek are of considerable scientific value, 

 giving us the morphological parallel to some of the Alveolino3 of 

 the Tertiary limestones of Central Europe and Western Asia. 



The fossils figured by Prof. Ehrenberg under the name Borelis 

 jyrinceps are from the "Hornstone of the Mountain-limestone of the 

 Pinega (Dwina), Archangel." They are much inferior in point of 

 size to those collected by Heer Verbeek, but otherwise the resem- 

 blance in morphological characters is sufficiently close, and the 

 specific name "princeps" acquires a fresh significance as applied to 

 the Sumatran fossils. The dimensions given in the " Mikrogeologie " 

 are ^ of an inch (4'0 mm.), by about -^ inch (3-0 mm.). Heer 

 Yerbeek's specimens vary considerably in size, the largest being 

 -n- 9 ^ of an inch (11 mm.) long, by T 4 ^ in. (10 mm.) broad ; tho 



