452 Mr. II. J. Carter on the Fossil Foraminifera of Scinde. 



opakc columns, too, are separated from each other by many 

 chambers, while in 0. dispansa, for the most part, they are only 

 separated by a ring of single chambers. 



Largest size. — Breadth -^inch. 



Loc. Valley of Kelat (Dr. Cook). 



Associates. — From the same bed of diminutive Foraminifera 

 as N. kelatensis, under which sec its associates. 



Obs. — Excepting the asteroid growth of this fossil, there is 

 nothing but the greater number of chambers which intervene 

 between the peripheral end of the columns to make it differ from 

 O. dispansa. Plane, expanded, and asteroid forms exist, indis- 

 criminately mixed together in the same deposit, but all diminu- 

 tive, like the rest of the Foraminifera of which this bed is com- 

 posed. The rays or ridges are occasioned by the " vertical 

 growth " of the test having been arrested between them. 



Note. — On comparing the sectional figures of 0. Pr at tii given 

 by Dr. Carpenter (Quart. Journ. Geol. Soc. vol. vi. pi. 8) with O. 

 dispansa (Lycophris dispansus, Sow.) and L. ephippium, I can see 

 no difference whatever between them, and therefore must con- 

 sider all as 0. dispansa, while the asteroid form just described 

 hardly differs sufficiently from any to deserve a separate specific 

 appellation. Hence, at present, I know but one type of all 

 these Orbit oides, viz. O. dispansa. 



Orbitolites Mantelli, Cart. 



"Orbitolites Mantelli, H. J. C." (Ann. Nat. Hist. I. c. p. 174).— 

 Is it this fossil that D'Archiac and Haime state, in their " Table " 

 (p. 363), " est bicn l'especc des Etats-Unis," viz. that called Orbi- 

 toides Mantelli by D'Orbigny ? To this question I have already 

 answered "Yes." It corresponds with the figures of this fossil 

 given by Dr. Carpenter (Quart. Journ. Geol. Soc. I.e.); and 

 having obtained specimens of it almost as richly infiltrated with 

 yellow oxide of iron as those of Orbitoides dispansa, I will now 

 also describe its structure much more minutely than I have be- 

 fore done, as much for the purpose of still further contrasting 

 the differences between these two fossils as for recording the 

 minute anatomy of the fossilized test itself, which the infiltration 

 enables me to do almost as well as that of Orbitoides dispansa. 



The test of Orbitolites Mantelli (PI. XVI. fig. 2, &c.) consists 

 of a horizontal plane of globular and cylindrical chambers (b I), 

 from each side of which proceeds a vertical growth of columnar 

 ones (bz). 



In the horizontal plane, everything is the same — in respect of 

 waviness, mode of growth around a minute or large central cell 

 (PI. XVII. fig. 2, «i) audits circumambient chamber (re 2), the 

 relative size of the chambers, their arrangement in rows, the bi- 



