172 Mr. H. J. Carter on Fossil Foraminifera in Scinde, 



one. There is another species (figs. 19, 20) of this character 

 which abounds in the nummulitic rocks at the island of Masira, 

 on the south-east coast of Arabia, but this appears to be N. Ga- 

 rausiana (Joly et Leymerie, Mem. sur les Nummulites, pi. 1. 

 figs. 9-12). It is also subgranular on the surface and presents 

 the reticulated structure of the species just described, but with a 

 tendency to radiation in its lines, which approximates it to the 

 Nummulites of the fii'st subgenus, and therefore its place in this 

 should precede N. acuta. Its diameter is 9-24ths of an inch, 

 and its thickness 3-24ths of an inch. 



The reticulated structure on the surface, while it characterizes 

 this subgenus of Nummulina, also allies it strongly to Orbitoides. 

 Another character which distinguishes N. acuta from the fore- 

 going species, is the greater length of the chamber being in the 

 direction of the spire instead of across it, and its subdivision 

 into reticulate ones, which, with the thinness of the central 

 plane, implies a commencing disappearance, or imperfect state, of 

 the latter generally ; it is also more abruptly prominent in the 

 centre and thinner and more expanded in the margin. All this, 

 while it separates N. acuta from the Nummulites of the first sub- 

 genus, tends towards the structure of Orbitoides, in which the 

 chambers of the central plane are arranged subspirally. The 

 lines too, which are seen descending in this as well as in other 

 discoidal Foraminifera, to the central plane, are but the opake 

 matter tilling up the interstices between the reticulate chambers ; 

 and in the midst of which are situated the interseptal vessels, 

 which pass down to the central plane and ramify throughout the 

 shell. 



CYCLOSTEGUES, D'Orbigny. 



Orbitoides, D'Orb. 



1. Lycophris dispansus, Sowerby (Grant's Geol.Cutch, luc. cit.). 

 Discoidal, wavy, more or less equilateral, centre abruptly promi- 

 nent, margin expanded and excessively thin and fragile at the 

 edge; surface subgranular or tuberculated, especially over the 

 central prominences; tubercles round, irregular in size and 

 shape, united together by stellate lines. Internally presenting 

 an extremely thin plane of quadrangular chambers, compressed 

 vertically ; oblong, and ai-ranged subspirally, with their long axis 

 in the direction of the horizontal diameter of the shell. Com- 

 pressed chambers above and below the central plane, arranged 

 in successive layers, like those of Nummulites, and more or less 

 over each other, so as to form columns, which radiate more or 

 less regularly from the central plane to the periphery, and end 

 in the tubercles before mentioned. Diameter of largest specimens 

 half an inch (figs. 23-29). 



Loc. Scinde, Cutch, and Arabia. 



