NO. 4 FORAMINIFERA CUSHMAN 53 



in the microspheric and megalospheric forms of the species. This 

 adult character consists of chambers a half coil in length added suc- 

 cessively in planes 144° apart, five chambers being thus added before 

 a cycle is completed and a new chamber added in the plane of the 

 fifth preceding chamber and covering it exteriorly. The chambers 

 are thus ^2° from one another, but each as added is 144° from its 

 immediately preceding one in the series ; aperture typically elongate 

 with a simple tooth and with little or no elongation of the neck except 

 in certain of the more complex species. 



Genus MASSILINA Schlumberger, 1893 

 Plate 14, fig. 7 



Test composed of a globular proloculum followed by a Cornuspira- 

 like chamber, making a half coil, these in turn followed by a series of 

 quinqueloculine chambers, in the adult composed of chambers ar- 

 ranged like Spiroloculina in a single plane, leaving the center open 

 and the chambers a half coil in length. 



Genus ARTICULINA d'Orbigny, 1826 



Plate 14, fig. 8 



Early chambers usually quinqueloculine or triloculine, later ones in 

 a uniserial arrangement, varying considerably in number according 

 to the species ; aperture in the adult a rounded, usually elliptical open- 

 ing, in a depression with a definite phialine lip. 



Genus SIGMOILINA Schlumberger, 1887 



Plate 14, fig. 9 



Test in its early stages quinqueloculine, later developing chambers 

 a half coil in length in two series, with each newly added chamber in 

 a plane more than 180° from the previous one, so that the horizontal 

 plane in section shows a gradual turning about the elongate axis of 

 the test, aperture typically with a single, simple tooth. 



Genus HAUERINA d'Orbigny, 1848 

 Plate IS, fig. I 



Test compressed with the early chambers milioline, the later and 

 greater portion of the test having the chambers arranged in a piano- 

 spiral manner, usually in the last-formed coil at least with more 

 than two chambers in each whorl, surface smooth or ornamented ; 

 aperture of a large number of small pores forming a sieve-like plate, 

 usually much longer than wide. 



