CHAPTER I.' 



Branch PROTOZOA. 



Class RHIZOPODA, 

 Order FORAMINIFERA. 

 Family LITUOLID^. 

 Sub-family LITUOHN/E. 



Genus Haplophragmium Reuss. 



Haplophragmium concavum Bagg. 



Plate I., Figs. 1-2. 



1898. Haplophragmium concavum Bagg., Bull. U. S. G. S., No. 

 88, p. 27, pi. 2, figs. I a-b. 



Description. — "Test arenaceo-siliceous, rough, of a dull-gray 

 color; consisting of eight or nine chambers, which are concave 

 upon their inner margin, giving the form an approximately tri- 



' This chapter on the Protozoa has been taken almost in its entirety from 

 Bulletin No. 88 of the United States Geological Survey, "The Cretaceous- 

 Foraminifera of New Jersey," by Dr. R. M. Bagg, Figures have been added, 

 however, to illustrate many of the species, copied for the most part from the 

 Challenger Report on the Foraminifera. In using these figures for purposes 

 of identification it must always be kept in mind that they were drawn from 

 recent specimens, and that they will often differ somewhat in appearance from, 

 fossil specimens. It is believed, however, that these figures will be of material 

 assistance to those wishing to identify the species. 



In recording the formations and localities of the species, Bagg has been 

 followed, although the names of the formations have been changed to cor- 

 respond with the usage in the present volume. In most cases it has been 

 clear from the original references from what formations, here recognized, 

 the species were collected, but in the cases of those forms recorded from the 

 "Rancocas" it has not always been clear whether the specimens came from the 

 Hornerstown marl or the Vincentown limesand. In consequence of this, a 

 few errors may have crept into the formation records here given. 



In recording the geographic distribution of the species no attempt has. 

 been made to go beyond North America, but in the case of those forms which 

 have also been recognized in the Tertiary formations of America, such occur- 

 ence has been noted. 



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