12 SlDEBOTTOM, Foraviinifera from the Island of Delos. 



Polymorphina problema, d'Orbigny. (PL 2, fig. 19.) 



Guttalina problema, d'Orbigny ('46), p. 224, pi. 12, 

 figs. 26-28. 



G. austriaca, Id. ibid., p. 223, pi. 12, figs. 23-25. 



Polymorphina problema (d'Orb.), Brady, Parker and 

 Jones ('70), p. 225, pi. 39, fig. 1 1. 



P. problema (d'Orb.), Brady ('84), p. 568, pi. 72, fig. 20, 

 and pi. 73, fig. 1. 



Very fine and typical examples occur of the above 

 two forms. Brady, Parker, and Jones in their monograph 

 of the genus state " that the two forms inosculate to such 

 an extent that it seems impossible to draw any line of 

 demarcation between them," and this is the case with the 

 Delos forms. Frequent, and rare, respectively. 



Polymorphina oblonga, d'Orbigny. (PI. 2, fig. 20.) 



Polymorphina oblonga, d'Orbigny ('46), p. 223, pi. 12, 

 figs. 29-31. 



P. guttata, Reuss ('70), p. 487 ; Schlicht ('70), pi. 30, 

 figs. 25-32. 



The tests are not typical, but I think they must be 

 brought under this head. They come nearest to Schlicht's 

 figures in the above reference, which are referred by 

 Reuss to this species. They vary a good deal in the 

 proportion between the length and breadth of their tests, 

 and also as to the inflation of the chambers. One fairly 

 typical test in the fistulose condition was found. Rare. 



Polymorphina irregularis, d'Orbigny. (PI. 2, fig. 21.) 



PolymorpJiina irregularis, d'Orbigny ('39), p. 137, pi. 2, 

 figs. 12, 13. 



P. irregularis (d'Orbigny), Brady, Parker and Jones 

 ('70), p. 239, pi. 41, fig. 29. 



