AKT. 6 FORAMINIFERA: POLYMO RPHINIDAB — CUSHMAN AND OZAWA 25 



Bordeaux that in size and general arrangement of chambers are very 

 similar. 



GUTTULINA IRREGULARIS (d'Orbigny) 



Plate 3, figures 4, 5; Plate 7, figures 1, 2 



GlobuUna irregularis d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, 



p. 226, pi. 13, figs. 9, 10. — CusHMAN and Thomas, Journ. Pal., vol. 3, 



1929, p. 177, pi. 23, figs. 2a-c. 

 Guttulina dilatata Reuss, Denkschr. K. Akad. Wiss. Wien, vol. 1, 1850, 



p. 378, pi. 48, fig. 11. 

 Guttulina problema d'Orbigny (not d'Orbigny 1826), Foram. Foss. Bass. 



Tert. Vienne, 1846, p. 224, pi. 12, figs. 26-28.— Reuss, in Geinitz, 



Grundr. Verstein., 1845-46, p. 669, pi. 24, fig. 83. 

 GlobuUna guttula Reuss, Zeitschr. deutsch. geol. Ges., vol. 3, 1851, p. 82, 



pi. 6, fig. 46. 

 Guttulina semiplana Reuss, Zeitschr. deutsch. geol. Ges., vol. 3, 1851, p. 82, 



pi. 6, fig. 48. 

 Guttulina centrata Terquem, Mem. Soc. Geol. France, ser. 3, vol. 1, 1878, 



p. 46, pi. 4 (9), figs. 25a-26. 

 Polymorphina byramensis Cushman, U. S. Geol. Survey Prof. Paper 129-E, 



1922, p. 94, pi. 17, figs. 2a, b; Idem, Prof. Paper 133, 1923, p. 31, pi. 5, 



figs. 1-5. 

 Guttulina byramensis Cushman and Schenck, Univ. Calif. Publ., Bull. 



Dept. Geol. Sci., vol. 17, 1928, p. 309, pi. 43, figs. 6-8. 



Test oval to subdeltoidal, equUaterally triangular with rounded 

 sides and angles, excepting the acute apertural end ; chambers more or 

 less angular, elongated, arranged in a clockwise, quinqueloculine 

 series, each succeeding chamber excepting the last one or two cham- 

 bers in fidl grown specimens coming down to the base; sutures de- 

 pressed, distinct; wall smooth, but in full-grown specimens often 

 having the last small chamber with spines or covered with fistulose 

 tubes; aperture radiate. 



Length, 0.45-1.40 mm.; breadth, 0.30-1.20 mm.; thickness, 

 0.20-0.75 mm. 



Guttulina irregularis is closely related to Guttulina problema in its 

 quinqueloculine arrangement of chambers and depressed sutures, 

 and naturally it was recorded by most authors under the names of 

 Guttulina problema or Guttulina communis. D'Orbigny himself 

 described and figured the present species in the Vienna monograph 

 as three different species, Guttulina communis, Guttulina problema, 

 and GlobuUna irregularis. Ozawa examined both holotype and 

 paratype specimens of the above three species as well as a great deal 

 of material collected from the Vienna Basin Tertiary, and is con- 

 vinced that the three species as used in the 1846 paper are really 

 nothing more than one and the same organism in different phases of 

 growth. "Guttulina communis" is the adult and most common form 

 of d'Orbigny. Guttulina problema is an older stage with one more 

 chamber, and GlobuUna irregularis represented by a somewhat 



