ART. 6 FORAMINIFEEA : FOLYMORPHINIDAE — CUSHMAN AND OZAWA 127 



and if we compare only the figures, we are easily led to separate them 

 into many species. 



Roemer's figures of Polymorphina regularis are fairly well drawn 

 and show the characteristics of the species — a clockwise sigmoid 

 arrangement of chambers, each succeeding chamber removed farther 

 from the base. Accordingly, the side view shows that on the right 

 side more than two-thirds of the surface is occupied by a series of 

 regularly arranged, not much embracing, elongate chambers, while 

 on the left is a series of a lesser number of much embracing, wide, 

 and short chambers. 



Bornemann's figures of Polymorphina humboldti appear to be more 

 inflated than Polymorphina regularis, but all of Bornemann's speci- 

 mens are few chambered and undoubtedly represent young stages of 

 the present species as his measurements show. Bornemann's speci- 

 mens measure from 0.6 mm. to 1.5 mm. in length while Roemer's 

 specimen having numerous chambers is much larger, attaining almost 

 3 mm. in length. We have a good series of the species from young 

 to adult obtained from Cassel, Germany. 



Strictly speaking, it is not certain whether or not Reuss's Poly- 

 morphina regularis is the same as that figured by Roemer, because, 

 when he described Polymorphina anceps Philippi in 1855 ^° he placed 

 under its synonymy the Polymorphina regularis described by him in 

 1851 and Polymorphina compressa Philippi not Polymorphina regularis 

 V. Miinster in Roemer. Moreover, he gave the precedence to Poly- 

 morphina anceps described later than Polymorphina regularis. How- 

 ever, his figures of Polymorphina anceps in the same paper are all 

 given the name of Polymorphina regularis. Reuss's figures show that 

 his Polymorphina. anceps or regularis has the chambers regularly 

 alternating in a biserial series as in Polymorphina compressa and 

 P. anceps reported by Philippi, and as far as his figures are concerned 

 his species as well as Philippi's Polymorphina anceps differs from either 

 Polymorphina regularis v. Miinster or Polymorphina humboldti 

 Bornemann. 



We have examined a large number of specimens obtained from the 

 Oligocene deposits of various localities in Germany, but could not 

 find any specimen like Philippi's Polymorphina anceps which, ac- 

 cording to Reuss, is not rare. Therefore it maj' be supposed that 

 Polymorphina anceps is the same as Polymorphina regularis, and the 

 figures of the species given by Philippi and Reuss are much conven- 

 tionalized according to their conception of the Polymorphinidae. 

 Specimens having a sigmoid arrangement of chambers are very often 

 mistaken by various authors and not well drawn. 



to Zur Fauna des deutschen oberoligocens etc., p. 38. 



