8 PAUNA OF BALUCHISTAN. 



PKOTOZOA. 



I. Class : RHIZOPODA. 



Order: FORAMINIFERA. 



Family: NOMMULINIDJE. 



Genus : ORBITOIDES, d'Orbigny. 

 Orbitoidbs socialis, Leymerie. PI. I, fig. 1-la, 2-2c, S-3c, 4fid. 



1851. Orhitolites Leymerie, Sur un nouveau type Pyren. : Mem. Soc, Gdol. de France, ser. ii, 



IV, 191, pi. A, fig. 5. 



The disciform test is sometimes rather irregular but always thin, with a sharp 

 cutting margin. The largest specimen has a diameter of 12 mm., but the average is 

 about 7 mm. Generally both sides are convex, but sometimes one is a little more so 

 than the other, and in this case one is almost flat. The thickness of the test varies 

 therefore considerably, and it is not always the largest specimen which is thickest. 

 The centre of each side is raised into a low rounded mamelon, that of the upper 

 side being usually larger. Both sides are covered with a very fine, shagreen-like 

 ornamentation, which, however, easily wears off. 



Locality and stratigrapMoal position. — Des valley, horizon 2. 



Remarks. — Its general shape makes this species easily recognisable, and there 

 is no doubt as to the identity of the Baluchistdn forms with those of the Pyrenees, 

 but it seems that in Baluchistan it undergoes certain variations with regard to 

 the thickness of the test. There are, for instance, specimens which closely resemble 

 Orhitolites seoans, Leym., but which, on other hand, are so closely connected with the 

 typical form, that it would be unjustifiable to consider them as separate species. 



This species has also been found in Asia Minor,^ where it holds a position 

 similar to that in Baluchi^tdn and the Pyrenees. 



Family: MILIOLID^. 



Genus : ORBITOLITES, Lamk. 

 Orbitolites maceopoka, Defrance. PI. I. 2-2c, 3-3c, 4-4d. fig. 5-56, 6-65. 



1825. Orbitolites Macropora, Defranoe, Diet, dea so. natnr., Vol. XXXVI, p. 295. 



1851. Orbitolites disculus, Leymerie ; Sar nn nouveau' type Pyr. : Mem. Soe. Glol. de Fi-ance, ser. ii. 



Vol. IV, 191, pi. A, fig. 1. . 



1866. Orbitolites macropora, Tohihatcheff, Asie Mineure, Paleontologie, p. 103. 



The thin test, which attains a diameter of about 10 mm., is orbicular, deeply 

 concave in the central part of each side, but flattened along the periphery. 



* Tchihatehetf. Asie Mineure, Faleoutologie, p. 103. 



