Mr. H. J. Carter on the Fossil Foraminifera of Scinde. 3G9 



separate Assilina than Assilina from Nummulites. It is only 

 their greater size and thickness which, making- them nummi- 

 form, appears to ally them to Nummulites. If N. spira were 

 called " Assilina spira," its fundamental structure would be 

 understood at once, while Nummulites spira would imply quite a 

 different type. Besides, by using the term " Nummulites" for 

 all, we require so many more "specifics;" whereas the same 

 specific would do for two species, if the generic name were dif- 

 ferent. Thus there is a Nummulites obesa, but I want this term 

 of designation for another form of Nummulite, which I could 

 not use were it not called Assilina. 



Nummulites. 



"1. N ?" (Annals Nat. Hist. /. c. p. 169).— This large 



Nummulite has been called N. Carteri by D'Archiac and Haime 

 (p. 344), but only "provisionally," as these authors did not feel 

 certain that it was not a variety of N. perforata. Subsequent 

 examination, however, in comparison with their descriptions of 

 the Punctulatte, leads me to consider it decidedly a different spe- 

 cies; and therefore I will now describe it more particularly: — 



N. Carteri, D'Archiac and Haime. — Discoidal, equilateral, thin, 

 flat or wavy, gradually diminishing in thickness from the centre 

 towards the circumference. Septal lines tortuous, more or less 

 branched, arranged irregularly in whorls here and there on the 

 surface, attached to and having between the lines more or less 

 white puncta. Internal structure. — Turns of the spire and cham- 

 bers very numerous and very irregular, the latter narrower in 

 the direction of the spire than across it, and much reflected. 



Largest size. — Breadth 2\ inches (64 millim.) ; thickness 

 T 2 ¥ inch (4|- millim.). Turns of the spire, altogether, about 45. 



Loc. Upper Scinde (Col. Turner). 



Associates. — Assilina exponens (var. b), A. obesa, N. spira, 

 N. obesa. 



Obs. — This may be generally termed a "large thin Nummu- 

 lite." Its greater breadth, thinness, irregularity of spire, and 

 greater number of chambers, which are more reflected, narrower, 

 and have their longest diameter across instead of in the direction 

 of the spire, even to within a few of the outer turns, separate it 

 from N. perforata, as well as from N. Sismondai, and indeed 

 from all the Punctulata figured by MM. d'Archiac and Haime, 

 except the Scindian species called N. obtusa, which, although 

 agreeing with N. Carteri in the narrowness of its chambers con- 

 tinuing towards the margin, and thus also differing from ail the 

 other Punctulata except N. curvispira, nevertheless markedly 

 differs from N. Carteri, like the other Punctulatce, in all the 



Ann. $ Mag. N. Hist. Ser.3. Vol. viii. 24 



