368 Mr. H. J. Carter on the Fossil Foraminifera of S chide. 



larger than in the second variety or typical form. In short, it 

 is, if not a different species, a large coarse form of N. exponens. 



Largest size. — Breadth |-| inch (51 millim.). Thickness 

 fl inch (3^ millim.). 



Loc. Valley of Kelat (Dr. Cook) j Upper Sciude (Col. Turner). 



Associates. — Assilina obesa, N. spira, N. perforata, Orbit oides 

 dispansa, Conulites Cooki, Alveolina elliptica. 



3. Assilina obesa, n. sp. (PI. XV. fig. 2, &c). — Discoidal, thick, 

 plane towards the centre, abruptly thin towards the margin, 

 which is sharp and wavy. Presenting a group of white puncta 

 more or less approximated towards the centre, which become 

 scanty and scattered in the opposite direction, where they chiefly 

 pass into irregular curved lines that, with a circular linear frag- 

 ment here and there, indicate respectively the subjacent septa 

 and spicular cord. Internal structure. — Turns of the spire broad, 

 slightly approximated towards the margin, commencing from a 

 large central cell. Spire single throughout, but more or less 

 irregular in course ; septa curved, reflected. Chambers vary in 

 size, but generally a little longer in the direction of the spire 

 than across it. No lateral prolongation of the chambers towards 

 the centre over the surface of the foregoing turns. 



Largest she. — Breadth ^| inch (llj millim.). Thickness 

 ■^■g inch (-1 millim.). Number of turns in the spire 7-8. 



Loc. Valley of Kelat (Dr. Cook); Upper Scinde (Col. 

 Turner). 



Associates. — Assilina seu N. exponens (varieties a and b), N. 

 Carteri, N. perforata, N. spira, Orbitoides dispansa, Conulites 

 Cooki, Alveolina elliptica. 



Obs. — The approximation of the outer turns of the spire here 

 (b), as in other full-grown Nummulites, indicates the limit of 

 the size in the locality, though not always the limit generally, 

 and so far separates it from the foregoing Assilince; but a more 

 decided difference exists in the greatest width of the chambers 

 being in the direction of the spire instead of across it (d). This, 

 while it agrees with the Punctulat<e of D'Archiac and Maime, is 

 the very opposite of what is found in N. exponem and its varie- 

 ties. The central cell and turns of the spire are much larger 

 than they are in N. exponens and N. spira, where there are six 

 within a radius of ~ inch, while in A. obesa there are only 

 three. 



Note. — I still prefer the generic name of "Assilina " for these 

 Nummulites, although they appear to me to be rightly placed by 

 D'Archiac and Haime in a distinct "group," viz. the Explanatce ; 

 but the chambers being confined to the horizontal plane cause 

 them to differ from Nummulites almost as much as the latter 

 from Operculina, from which, again, it is much more difficult to 



