52 FORAMINIFERA 



several species were known at the time of its naming, but the 

 particular genotype neither then nor since designated. 

 Synonyms have been introduced where it would seem to be a 

 help in the understanding of the earlier literature. Many generic 

 names used in the foraminifera will not be found here as it is 

 necessary to see the actual types before they can be placed with 

 full confidence. The author undertook this past year to see as 

 many genotypes as possible, and in all but about six percent of 

 the genera here used, the type species, either the actual type 

 specimen or authentic material, was seen. In the case of the 

 others, they are very rare forms usually based on a single speci- 

 men, and not readily available. For generous help in the loan of 

 material and opening collections for his study, the author is 

 greatly indebted to many individuals and to those in charge of 

 the numerous European type collections. 



The ranges given for the genera are made from the author's 

 own experience together with a consultation of the literature. 

 Some of the earlier records, especially those from the Palaeozoic, 

 should be confirmed before it can definitely be determined 

 whether or not the genus as recorded is the same as the present 

 day record for it. This is however a base upon which to build 

 rather than a finished work, and is offered as such. 



SYSTEMATIC TREATMENT 



ORDER FORAMINIFERA 



Animals with a single cell, a protoplasmic body usually de- 

 veloping some sort of test, of chitin, agglutinated material, or of 

 calcareous or rarely siliceous material secreted by the animal, 

 typically with one or more definite apertures and the test usually 

 perforate, in some families imperforate, pseudopodia of fine 

 threads freely anastomosing to form a net work. 



