464 
diameter was megalospheric. With regard to the two first-mentioned 
specimens I did not succeed in including the little embryonal chamber 
into the preparation. 
1. Megalospheric form. 
The median plane is but little curved: the median chambers form 
frequently incomplete circles round the very large embryonal cham- 
bers, whose maximal and minimal diameters are 2500 » and 1800 u. 
The parietis of the embryonal chamber is thin. The peripherical, 
median chambers of the first round are larger than those situated 
more outward: 
1st round diameter of the chamber radiary 190 p, tangentially 55—75 u 
more peripherically maxim. diameter radiary 150 u, tangentially 60 u. 
2. Mierospberic form. 
In these large Orbitoids of exterior regular lensshape the median 
plane shows a strong saddle-shaped curve, as in the median hori- 
zontal section only narrow ligaments of median chambers running 
hyperbolically have been struck (comp. VerrBeEK and Frnnema 1896. 
Pl. 10, Fig. 150). The radiary diameter of the median chambers increases 
from the centre of the periphery, though constantly smaller chambers 
are scattered among the larger ones. The normal dimensions of the 
chambers are about: 
At 2 mm. from the centre: radiary 45-75 u, tangentially 35-55 u. 
Nearer to the periphery : a heo-1o0 rm x 35-55 u. 
The grouping of the- intermediate skeleton-columns to which of 
late, for a systematical purpose, Dovviuré (l.c, 1912) attaches such 
a great value can distinctly be observed. Their thickness in tan- 
gential diameter is 55—95 u, it may be however that very near the 
periphery they are a little thicker. As a rule columns are only sepa- 
rated from each other by a single row of spacious lateral chambers. 
Consequently the exterior habitus and structure of these Formani- 
fera correspond very well with the forms described by VERBEEK 
(1896) as O. papyracea var. javana and witb those described by 
Dovvirré (1912) as O. javana, only the megalospheric form of this 
species was not yet known hitherto. 
From the finding-place near Mount Mada (n°. 81) I received 
two Orbitoids (diam. 14 and 30 mm.) which correspond very 
well with the former, and the larger of which was again micro- 
spheric. I succeeded in including into the preparation the very 
small embryonal chambers round which the first peripherical cham- 
