16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



and one Aulostomella {A. dorsigera) appears to belong to the Polymor- 

 phinidae. 



Ehrenberg described very many species of Polymorphina which 

 were examined by us at the Museum of Natural History in Berlin, 

 but most of them are mounted in Canada Balsam, and it is very diffi- 

 cult to determine them. Ehrenberg placed under Polymorphina 

 various biserial forms such as Virgulina and Bolivina, but there are 

 none of his species which can be considered with confidence to belong 

 to the Polymorphinidae. Therefore we omitted his species. 



Miller's three species of Polymorphina are apparently glauconiti(? 

 nodules with cracks and not recognizable. Polymorphina complexa 

 Sidebottom from the Kerimba Archipelago has the same arrangement 

 of chambers as Guttulina, but it has pores along the suture lines, and 

 the aperture is quite different from any genus of the family. It 

 may be a new genus belonging to some other family. 



Silvestri described one new species and two new varieties from the 

 Pliocene at Coroncina. His Polymorphina pliocaena and its variety 

 tricostata are evidently young specimens of Robulus. P. oblonga 

 var. Jistulosa is a fistulose Guttulina. 



There are still many doubtful species of the family which are not 

 treated in the present paper: as, d'Orbigny's Polymorphina irregu- 

 laris (1839), P. rochefortiana, and many others. 



Genus EOGUTTULINA Cushman and Ozawa, new genus 



Test with the chambers arranged in a spiral series added in planes 

 less than 90° apart from one another, each succeeding chamber 

 removed farther from the base. 



Genotype. — Eoguttulina Anglica. 



EOGUTTULINA ANGLICA Cushman and Ozawa, new species 



Plate 1, figures 3 a—c 



Test elongated, more or less cylindrical, the greatest breadth in 

 the upper half, obtuse at the base, acuminate toward the apertural 

 end; chambers somewhat longer than broad, inflated, not much em- 

 bracing, arranged in a spiral series, each succeeding chamber much 

 farther removed from the base; sutures depressed, distinct; wall 

 smooth; aperture radiate. 



Length 0.65 mm..; breadth 0.28 mm. 



Holotype. — (Cushman Coll. No. 10990.) From Cretaceous, Cam- 

 bridge Greensand, Saxon Cement Works, Cambridge, England. 



In a certain position in side view, Eoguttulina anglica resembles 

 some elongated forms of Guttulina. Each succeeding chamber is 

 removed farther from the base, as in an elongated Guttulina, but 

 the chambers are arranged in a spiral series and not quinqueloculine. 



