Mr. H. J. Carter on the Fossil Foraminifera of Scinde. 367 



obesa, n. sp., Nummulites Carteri, N. biaritzensis, N. perforata, 

 Alveolina elliptica, Orbitoides dispansa, Conulites Cooki. 



« 2. A. ? " (Ann. Nat. Hist. /. c. p. 168).— This has been 



rightly identified by D'Archiac and Haiine (p. 343) with N. ex- 

 ponent, that is to say, the species so well described and figured 

 by them (p. 343, pi. x.). But there are two varieties besides 

 the typical form, viz. N. exponens ; and in the diagram which I 

 have given (Ann. Nat. Hist. /. c. pi. 7. fig. 7), the size of the first 

 variety of this fossil which I shall now describe (viz. a) has been 

 represented with the external markings of the typical form. 



Largest size. — Breadth \± inch (28| millim.). 



Loc. Lukput, in Cutch (Mr. Smith). 



Associates. — N. biaritzensis, Alveolina elliptica, Orbitoides 

 dispansa. 



Variety a. — This differs from the foregoing in being broader, 

 comparatively thinner, presenting more turns in the spire, and 

 narrower chambers, with a greater irregularity in both than in 

 the typical form (N. exponens), and therefore a consequent 

 greater irregularity in the external indications of the turns, 

 which are also less marked. 



Largest size. — Breadth f|- inch (43 millim.). Number of 

 turns altogether 30, and 19 in a radius of 11 millim. The 

 typical form given by D'Archiac and Haime is 30-35 millim. 

 in diameter, with 16 turns in a radius of 11 millim. 



Associates. — N. spira, N. perforata, Alveolina elliptica. 



Variety b (PI. XV. fig. 1, &c). — This is still broader and 

 thicker than the last variety (a), while the spire and chambers, 

 in the horizontal section, more nearly approach that of the typi- 

 cal form. Externally it is smooth [the indications of the septa 

 are not raised as in the typical form], wavy, diminishing gradu- 

 ally in thickness from the centre, which is plane [not depressed 

 as in the typical form], to the margin, which is thin. Presenting 

 a circular, white central portion, in which the markings of the 

 septa, &c, are undistinguishable, but beyond this, with the spi- 

 cular cord, become evident in the form of unraised white lines, 

 which more or less disappear again halfway between the centre 

 and the circumference. Spicular cord more marked than the 

 septa, which are almost straight and, after three or four turns, 

 only appear in fragments attached to the inner side of the cord, 

 at right angles, so as to present the appearance of Hebrew cha- 

 racters. In the typical form the septal lines are strongly marked 

 and slightly curved, beginning at the centre, but the spicular 

 cord for the most part not indicated externally, while in the first 

 variety (viz. a) there is a slight approach to the opposite state 

 in which these parts present themselves in the second variety. 

 Internally the spicular cord is much thicker and the chambers 



