256 Messrs. R. B. Newton and R. Holland on some 



the boulders (no. 984) specimens of N. Djokdjokartce in a 

 very decayed condition are here and there met with. The 

 specimen figured measured 3*5 millim. in width and the 

 central chamber measured "28 millim. The number of convo- 

 lutions was 4 or 4^, and the number of chambers in the spire 

 was about 64. The thickness of the specimen (judging from 

 the cast in the matrix) appears to have been from 1 to 2 millim. 



Prof. Molengraaff's slides contain various more or less 

 obscure sections of Nummulites. Some of tliera are possibly 

 referable to this species, others possibly belong to an alter- 

 nate form of the same or to distinct species ; but they do not 

 happen to be cut so as to enable us to determine their characters. 

 One of these indeterminate sections is shown in PI. IX. fig. 6. 



Occurrence. Prof. Molengraaff's material was obtained from 

 the beds of the Rivers Embalau and Tekelan. 



(B) Orbitoides. 



In the Appendix to the valuable work on the Geology of 

 Java and Madoura already referred to Dr. Verbeck gives a 

 very interesting chapter on the Orbitoides met with. He 

 reviews much of the work of other writers upon the genus, 

 and expresses himself in favour of reducing Giimbel's * five 

 subgenera to two — that is to say, he would xxmiQ DiscocycUna^ 

 BhipidocycUna^ Al^iinocyclina,, and Asterocyclina under the 

 subgenus Dtscocyclina^ comprising all Orbitoides having 

 rectangular chambers in the median plane ; and for the second 

 subgenus he would retain Giimbel's LepidocycUna^ comprising 

 the Orbitoides with rounded chambers in the median plane. 

 We quite agree in this arrangement. It appears to us that 

 the division into subgenera on the basis of the characters of 

 the chambers of the median plane is likely to give satisfactory 

 results, while divisions based on the external form or orna- 

 mentation of the shells, such as '"'' Rhijpidocyclina^^ ^^ Aktino- 

 cyclina^'' and " Aster ocycUna,^'' must lead to confusion. We 

 say this particularly because in the study of our Bornean 

 material we have come across fragments which, while they 

 are not sufficiently perfect for description, give us good ground 

 for expecting that specimens will presently be met with 

 having the external form of Giimbel's AsterocycUna, for 

 instance, coupled with the lozenge-shaped or spatuliform 

 median chambers which are characteristic of Lepidocyclina. 



We think it not improbable that the 0. {Asterocyclina) 

 siellata figured by Vaughan Jennings in his paper on the 



* " Beitrape zur Foraminifereii-Fauna der nordalpinen Eocaugebilde," 

 Abhandl. k. Bayer. Akad. Wiss. Classe ii. Band x. (1868). 



