NO. 4 FORAMINIFERA CUSHMAN }^J 



chambers usually extending to the umbilicus on the sides, in some 

 species the later portion of the test uncoiling; wall calcareous, per- 

 forate, usually smooth and without ornamentation ; chambers numer- 

 ous, the sutures usually distinct ; aperture loop-like, modified in 

 breadth and length in the different species. 



Genus EHRENBERGINA Reuss, 1850 



Plate 6, fig. 6 



Test free, early portion coiled, later portion uncoiled, composed 

 of numerous chambers arranged biserially about an elongate axis, 

 evenly united on the dorsal side but forming a deep groove on the 

 ventral border, generally triangular in cross section ; wall calcareous, 

 perforate, smooth, or ornamented with spines or ridges ; aperture 

 elongate, curved, nearly at right angles to the edge of the chamber, 

 with a slight lip. 



Family 5. LAGENIDAE 



Test calcareous, vitreous, finely perforate, either monothalamous 

 or made up of a series of chambers arranged in a straight or curved 

 axis, or close-coiled or spirally, or even in an alternating manner ; 

 aperture either radiate or simple or with a neck and phialine lip. 



Subfamily i. LAGENINAE 



Test consisting of a single chamber, the aperture either ecto- or 

 entosolenian. 



Genus LAGENA Walker and Boys, 1784 



Plate 6, fig. 7 



Test monothalamous, smooth or ornamented, generally flask- 

 shaped ; aperture ecto- or entosolenian. 



Subfamly 2. NODOSARIINAE 



Test polythalamous ; chambers arranged in a straight, arcuate, 

 planospiral or uncoiling series ; apertures either radiate or with neck 

 and phialine lip. 



Genus NODOSARIA Lamarck, 1812 



Plate 7, fig. 3 



Test composed of a straight or arcuate series of chambers, either 

 loosely joined together by stolons or close set and overlapping or 



