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



itself irregularly in eveiy direction. The latter character is not 

 more peculiar to it, however, than to the foregoing species. 



From its frequent deep, patulous and wavy form too, the sec- 

 tions of this Orbitolite often indicate a stellate or other complex 

 figure, which however is not the case when freed from the matrix 

 in which it may be imbedded; for with the exception of the 

 foliaceous extension mentioned, it seems almost always to be dis- 

 coidal. It is sometimes thicker on one side than the other, like 

 the last species, but tends more to a horizontal than a vertical 

 development, and therefore moi-e nearly approaches the species 

 about to be described, which is altogether discal, and without any 

 incrustation on either side, being representative only of the cen- 

 tral plane of this and the last species. 



D'Orbigny's genus Orbitolina, in which there is an incrusta- 

 tion on one side only, I have not yet seen, unless that be consi- 

 dered it, where one side is plane and the other convex, as in 

 fig. 33, which I think may be a variety in form of either of the 

 foregoing species, and which, after all, has an incrustation of 

 compressed cells on the plane side, although not prominent. 

 That species I consider to have no incrustation where the central 

 plane comes to the surface. 



Cyclolina, D'Orbigny. 



1. Cyclolina pedunculata (H. J. C). Inequilateral, discoidal, 

 smooth, thin in the centre, with a small papillary eminence on 

 one side ; thick at the margin ; presenting concentric circles on 

 the surface, alternately raised and depressed, with cells arranged 

 circularly, which are hardly visible to the naked eye (fig. 25). 

 Cells small in the centre, enlarging towards the circumference, 

 spheroidal interiox'ly, elongated at the surface (fig. 44), arranged 

 in circular rows, alternate in each row. Diameter of largest 

 specimens 10-12ths of an inch ; thickness at the margin 

 l-48th of an inch (PI. VII. figs. 43, 43). 



Loc. Scinde. 



Obs. This is, as it were, nothing but the central plane of the 

 foregoing species ; that is, its development rests here, there being 

 no incrustation on either side, and no compressed cells above or 

 below the disc. I have called it pedunculata from the little 

 papillary eminence in the centre on one side, this being constant 

 in the few specimens I possess. By a typographical mistake, 

 this species has been called " Indian " instead of Scindian, vol. x. 

 No. 57, p. 175, of this Magazine. 



Thus we have passed, in description, from the simple nautiloid 

 form of Operculina, in which the spire and septa are all visible 

 exteriorly, to Assilina, where they are more or less obscured in 



