Mr. H. J. Carter on the Fossil Forarainifera of Scinde. 463 



.Since I have had the advantage of Dr. Carpenter's clear and 

 valuable exposition of the structure of Orbitolites (Phil. Trans. 

 1855), there is no longer any doubt of my false identification of 

 this fossil with D'Orbigny's Cyclolina, nor of the true one being 

 with Orbitolites; and therefore, if it be really a new species, 

 which I also doubt very much, it might now go by the name of 

 " Orbitolites pedunculata." I expect, after all, it will be found 

 to differ very little from Orbitolites complanata of the " Paris 

 Basin.'' 



Associates. — Alveolina elliptica and a small Nummulite be- 

 longing to the Striat(B, on the Buran River, in Lower Scinde, 

 and, on the same river, the Orbitolina before mentioned, "No. 3;" 

 Alveolina sphceroidea and Operculina in the white limestone 

 forming the summits of the great cliff-scarps behind Morebat ; 

 and also Orbitolina "No. 4" ante, iu broken masses under 

 the great promontory of Has Sajar, on the south-east coast of 

 Arabia. 



Internal structure of Orbitolites pedunculata. — This is the same 

 as that given by Dr. Carpenter in his vertical sections 8 and 9, 

 pi. 6, and in his horizontal surface-view, fig. 8. pi. 7. The cham- 

 bers in the centre have not run into each other vertically, as 

 shown in Dr. Carpenter's "ideal representation," fig. 6. pi. 5, 

 neither are the chambers of the sui'face oblong, but globular, 

 while in the centre the rows are frequently oval instead of cir- 

 cular. Both these differences, however, as Dr. Carpenter ob- 

 serves, are no more than marks of variety. 



The peduncle at the base in the centre is composed of amor- 

 phous shell-substance, through which a number of branched 

 transparent lines extend upwards into the centre of the disk, 

 indicative of their once having been canals, perhaps occupied by 

 sarcode. Dr. Carpenter observes that the fossil was probably 

 attached during its lifetime to some marine body, and therefore 

 the peduncle here may be of very little specific value, — thu8 

 reducing the species to Orbitolites complanata. 



" Cyclolina arabica. Cart." (Geol. Papers on W. India, p. 550). 

 — This, if it be a new species, should have its name changed to 

 " Orbitolites arabica." The only difference between it and the 

 Scinde Orbitolite is its larger size and finer structure, which are 

 by themselves worth nothing as specific distinctions : hence, 

 perhaps, this also had better be considered as a variety of O, 

 complanata. 



Associates. — They have been given above under C. pedunculata. 



Note. — Feeling satisfied now that these fossils are Orbitolites, 

 and not Cyclolina, D'Orb., and that I have not found " Orbito- 

 lites " in the Cretacean strata of the south-east coast of Arabia, 

 I had first to correct my errors in nomenclature to accord with 



