OZ PROCEEDINGS OF THE NATIONAL MUSEUM vol. 7r 



Polymorphina clavata Roemer, Neues Jahrb.f. Min., etc., 1838, p. 386, pi. 3, 



fig. 38. 

 Polymorphina amygdaloides Cushman (not Reuss), U. S. Geol. Survey 



Prof. Paper 133, 1923, p. 32, pi. 4, fig. 9. 



Test clavate, rounded at the base, tapering toward the apertural 

 end, margin entire; chambers rounded, embracing, arranged at first 

 in an almost triserial series, later tending to become biserial; sutures 

 not depressed, distinct; wall smooth; aperture radiate, pointed. 



Length 0.50-0.60 mm.; breadth 0.18-0.25 mm.; thickness 0.18- 

 0.25 mm. 



The original specimen (in paleontological department. Museum of 

 Natural History, Jardin des Plantes, Paris) is lost. 



D'Orbigny's figures represent the species fairly well, although his 

 basal view showing the arrangement of chambers is not well drawn as 

 far as the figure of the side view is concerned. D'Orbigny's specimen 

 was obtained from the Pliocene at Castel-Arquato. We have 

 examined material from the same locality, but we could not obtain 

 any specimen resembling his species. The specimen figured here was 

 found in the Eocene material from Wansin in Belgium, and the speci- 

 men is very much like d'Orbigny's model in every respect. Our 

 specimen presents an arrangement of chambers not strictly triserial ^ 

 at first somewhat triserial, but later tending to become biserial. As 

 d'Orbigny's original specimen is lost and his figure of the basal view 

 apparently is not well drawn, the figure showing the side view is the 

 only means of knowing how the chambers of d'Orbigny's specimen 

 are arranged. Judging from his figure, at least the later chambers of 

 his species appear to be arranged in an almost biserial series, which: 

 seems to be the usual arrangement in a group of elongate, cylindrical 

 Polymorphinidae . 



D'Orbigny compared his species with Soldani's Polymorphium 

 jjyriformium figured in the Testaceographia. Soldani's specimen 

 resembles Pyrulina gutta in its shape, but judging from the figure it 

 seems to have fewer chambers, and it may be considered to a be a 

 young stage of Pyrulina gutta, but it is characterized by a peculiar 

 sigmoid suture, in which point it is quite distinct, and therefore it is 

 advisable not to place it in the synonymy of P. gutta. 



On the other hand, Polymorphina (Globulina) clavata figured by 

 Roemer from the German middle Oligocene, considered from his- 

 figure, very closely resembles Pyrulina gutta. 



We have additional specimens from the Eocene of France, Lutetien 

 of Grignon, Chaussy and Courtagnon ; also from the Eocene, Brackle- 

 sham beds XVII and XVIII, White Cliff Bay, Isle of Wight, England.. 



