KO. 4 FORAMINIFERA CUSHMAN 5 I 



Family 10. MILIOLIDAE 



Test typically calcareous, imperforate except in the very early 

 stages of certain genera, porcellanous ; sometimes the exterior with 

 arenaceous covering, but always on an imperforate calcareous base, 

 aperture typically with a tooth variously modified in different genera. 



Subfamily i. CORNUSPIRININAE 



Test usually free, the early stages composed of a proloculum and 

 elongate, coiled second chamber, later chambers typically planospiral, 

 of various lengths in typical chambers of the included genera. 



Genus CORNUSPIRA Schultze, 1854 

 Plate 12, fig. 6 



Test consisting of a proloculum followed by a long coiled tubular 

 chamber, typically without sept?e, complanate, the open end serving 

 as the aperture, occasionally somewhat constricted or with a thickened 

 lip, wall porcellanous. 



Genus OPTHALMIDIUM Zwingli and Kiibler, 1870 

 Plate 14, fig. I 



Test in general planospiral, compressed, all chambers visible from 

 the exterior on both sides, proloculum globular, followed by a coiled 

 second chamber making usually two or more coils, the following 

 chambers gradually decreasing in relative length, more or less loose 

 coiled, the intermediate area filled in with a shelly plate ; aperture at 

 the end of the chamber, rounded, without lip or teeth. 



Genus SPIROLOCULINA d'Orbigny, 1826 



Plate 14, fig. 2 



Test composed of chambers arranged planospirally, all visible 

 typically from opposite sides of the test, early chambers after the 

 proloculum sometimes a coil or more in length, but the adult chambers 

 one-half coil in length ; aperture typically somewhat produced ; aper- 

 ture circular, with a prominent lip and a bifid tooth occasionally, with 

 a secondary tooth directly opposite the primary one. 



Genus PLANISPIRINA Seguenza, 1880 



Test planospiral, chambers in the later growth often more or less 

 involute, concealing the early development, which consists of an oval 



