MONOGRAPH OF THE FORAMINIFEEAL FAMILY 

 POLYMORPHINIDAE, RECENT AND FOSSIL 



By Joseph A. Cushman, oJ Sharon, Massachusetts 



and 



YosHiAKi OzAWA,* o/ the Imperial University of Tokyo 



INTRODUCTION 



The Polymorphinidae, like many other families and groups of 

 Foraminifera, are in a state of confusion that makes it difficult to 

 identify species on account of the great number of forms figured under 

 the same name. Many names have also been given to the same 

 species. Brady, Parker, and Jones, in 1870, reviewed the subject in 

 their work, A Monograph of the Genus Polymorphina, and Jones and 

 Chapman later dealt at some length with the fistulose forms. 



We finished, two years ago, a preliminary study of the family intro- 

 ducing a new classification of the group, based on the relationships as 

 worked out in a joint study of many species. Some of the results of 

 this study have been published : An Outline of a Revision of the Poly- 

 morphinidae,^ Some Species of Fossil and Recent Polymorphinidae 

 Found in Japan, and A Revision of Polymorphinidae.^ 



Since the completion of the first studies we have both spent some 

 time in Europe studying collections and collecting and preparing 

 material, the results of which are embodied in the present paper 

 after a further six months' study together of the material brought 

 together in our combined collections. 



We found that the published figures for the most part were not 

 accurate enough in their details to be reliable in many cases, and except 

 for a study of the available type specimens the study of our own 

 abundant material has been the main source of our conclusions. 

 Nevertheless the type figure and description have been studied in all 



* WhOe this paper was in press, notice of the death of Doctor Ozawa in Tokyo on December 29, 1929, 

 was received. The correction of proof is therefore entirely mine, with the exception of some few notes I 

 received from Doctor Ozawa after his return to Japan, where he again went over the duplicate manuscript. 

 It is to be regretted that he was not able also to examine the proofs, for his keen mind would undoubtedly 

 have found errors that I have probably overlooked. 



Through the characteristic generosity of Doctor Ozawa, my collection at Sharon was made the depository 

 of nearly all the types and slides of all the species and varieties from the various localities. This collection, 

 which will eventually find its way to the U. S. National Museum, is therefore exceptionally complete for 

 this family, which occupies considerably more than a thousand slides and many thousands of specimens.— 

 Joseph A. Cushmam. 



1 Contr. Cushman Lab. Foram. Res., vol. 4, 1928, pp. 13-21, pi. 2. 



2 Jap. Journ. Geol. Geogr., vol. 6, 1929, pp. 63-83, pis. 13-17. 



92709—30 1 1 



