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dispansa Jones and CuapMan (Q. dispansa Brapy and O. 1 A VERBEEK 
and Frnnema); the material is however too insignificant to admit of 
a reliable determination. It is however of importance that we find 
in a level characterized by a frequent occurrence of a primitive 
Lepidoeyelina, likewise a few representatives of types younger ac- 
cording to Douvirré (l.c. p. 449). Perhaps it is likewise remarkable 
that these younger forms show here evidently great variety in one 
important characteristic, (the wart-shaped appearance of the skeleton- 
columns at the surface). 
From a lime-marl at the Sungei Blakan by washing a great 
number of Foraminifera were obtained, the greater part of which 
belonged to Orbitoides. From this rough material the different sorts 
could now be selected, and it appeared that in this way strongly 
separated series of forms could be obtained, it was but seldom doubtful 
among which group a definite specimen ought to be ranged. 
With great application and perseverance my wife performed the 
fatiguing work, taking up so much time of washing and selecting 
the sorts. 
The sorts collected here are the following : 
O. (Lepidocyclina) acuta n. sp. 
Of this sort about 50 specimens were found the horizontal diameter 
of which varied from 3—7 mm. One sees at the surface the irre- 
gularly bordered lateral chambers, whilst at the edge sometimes the 
median chambers are likewise visible, as here the lateral ventricles 
may be missing. The centre of the disk is taken up by a single 
skeleton-column which is sometimes diffuse and variable in size, and 
can likewise consist of an agglomeration of small columns. There 
are no other skeleton-columns placed nearer towards the periphery. 
The central part of the disk is strongly drawn out in a vertical 
direction, so that the Foraminifere is pointed at both extremities, 
which gives to this Orbitoid a very peculiar shape (acuta). The 
fact that these skeleton-columns are restricted to the lengthened ver- 
tical axis is obviously very appropriate. This lengthening in a vertical 
direction is however subject to many variations; it can be so im- 
portant, that the vertical diameter becomes longer than the horizontal 
one (I measured in one case d 3 h 3'/, mm.). The peripheral edge 
is with this form always flat never bent saddle-shaped. 
Horizontal section. Neither could I observe the embryonal chamber 
here; it must however be very small, as the median chambers 
reach to the immediate vicinity of the centre. The more central 
