ART. 6 FORAMINIFEEA: POLYMORPHINIDAB — CUSHMAN AND OZAWA 61 



Glohulina ovalis Terquem, Essai Class. Anim. Dunkerque, 1878, p. 77, pi. 10, 



fig. 2. 

 Glohulina oviformis Terquem, Mem. Soc. Geol. France, ser. 3, vol. 1, 1878, 



p. 44, pi. 4 (9), figs. 9-12. 

 Glohulina transversa Terquem, Mem. Soc. Geol. France, ser. 3, vol. 2, 1882, 



p. 129, pi. 13 (21), figs. 17-21. 

 Guttulina ponderosa Terquem, Mem. Soc. G^ol. France, ser. 3, vol. 2, 1882, 



p. 135, pi. 14 (22), fig. 1 a, b. 

 Guttulina gravida Terquem and Terquem (not Terquem 1878), Bull. Soc. 



Zool. France, vol. 11, 1886, p. 334, pi. 11, fig. 21. 

 Polymorphina inflata Terquem and Terquem (not Terquem 1878), Bull. 



Soc. Zool. France, vol. 11, 1886, p. 335, pi. 11, fig. 23. 

 Polymorphina lactea (Walker and Jacob) var. diffusa Cusbman, Bull. 71, 



U. S. Nat. Mus., pt. 3, 1913, p. 84, pi. 41, fig. 8. 



Test globular to subgiobular, transverse section almost circular; 

 chambers few, inflated, rounded, arranged in a nearly triserial series; 

 sutures not depressed, generally clear; wall smooth, translucent, 

 often with fistulose tubes, especially at apertural end; aperture radiate. 



Length 0.45-1.10 mm.; breadth 0.40-0.90 mm.; thickness 0.40- 

 0.90 mm. 



D'Orbigny's original specimen is lost. 



Glohulina gibba is definite in its general characters; still there are 

 several distinct varieties, and many specific and varietal names are 

 given by various authors to forms which seem merely variations of 

 the typical. 



D'Orbigny's model has a globular test, with a slightly produced 

 apex. Egger's Polymorphina gibba var. pyrula represents a form 

 with a much produced apex, and Giimbel's Globulina subgibba is typi- 

 cally spherical, while Karrer's Polymorphina gibba var. orbicularis has 

 a spheroidal test, shorter than broad. 



There are some individuals which can be compared with Egger's 

 Polymorphina gibba var. ovoidea and subgibba and Terquem.'s Glohulina 

 oviformis, transversa, ponderosa, and inflata, in which the chambers are 

 either unequall}^ overlapped or not very regularly combined. 



There are numerous fistulose forms, some of which are very elab- 

 orate and have been given difl^erent names, in which the main body 

 of the test is typically Globulina gibba. 



Distribution. — Glohulina gibba is often recorded from the Jurassic 

 and Cretaceous formations, but as far as our material is concerned 

 there are no Mesozoic Glohulina gibba. 



The Cretaceous Globulinas having a more or less globular test are 

 separated from Tertiary Globulina gibba, as is described in later pages. 

 We have examined in our collection more than 1,200 specimens of 

 Globulina gibba, and the distribution of these is given below. It is 

 very noteworthy that of all these specimens the only Recent ones are 

 from the Mediterranean and ofi Ireland. In the Pliocene the records 

 are almost entirely from the same region. In the Miocene the dis- 



