Plate 50. HORNERSTOWN GLOBIGERINA AND GLOBOROTALTA 



(All figures: a, spiral view; b, umbilical view; C, edge view; al 



US) 



Figure 1. Globorotalia perclara Loeblich and Tap- 191 

 pan, new species 



Paratype (USNM PS82S), showing small size, 

 gradually enlarging chambers of equal breadth 

 and height, subtruncate periphery, large and 

 open umbilicus, small aperture and spiny sur- 

 face. 

 Figure 2. Clohigerina species 184 



Small specimen (USNM PS849) with four 

 chambers in final whorl, spiny surface and 

 broadly rounded periphery. 

 Figure 3. Globorotalia rcissi Loeblich and Tappan, 194 

 new species 



Paratype (USNM P5836) showing small size, 

 rounded chambers, rounded periphery and 

 smooth wall. 

 Figure 4. Globorotalia angulata (White) 187 



Hypotype (USNM P5893), showing lunate ap- 

 pearing chambers and curved, elevated and 

 beaded sutures on the spiral side, subacute and 



Page 

 angled umbilical shoulder and radial sutures on 

 the umbilical side, and the keeled periphery. 

 Figure 5. Globorotalia trichotrocha Loeblich and 195 

 Tappan, new species 



Paratype (USNM PS690), showing lenticular 

 test, spiny surface, low aperture, depressed 

 sutures which are curved backwards on the 

 spiral side and are radial around the small open 

 umbilicus on the umbilical side. 

 Figure 6. Globorotalia aeqiia Cushman and Renz 186 

 Hypotype (USNM P5889), showing few 

 chambers per whorl, rapid increase in chamber 

 size, spiny surface, peripheral keel, and elevated 

 and angled umbilical shoulder. 

 Figure 7. Globorotalia convexa Subbotina 188 



Hypotype (USNM P5845), showing sub- 

 globose test, broad low chambers on the spiral 

 side and strongly curved sutures, with elevated 

 spire, radial sutures on umbilical side and low, 

 e.xtraumbilical-umbilical aperture. 



287 



