118 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Plate 44. 



Fig. 1. Uvigerina interrupta. X 75. a, front view; b, side view; c, apertural view. 



2. Uvigerina porrecta. X 75. a, front view; b, front view; c, apertural view, a 



more attenuate specimen. 



3. Uvigerina stnatula. X 75. a, front view; b, side view; c, apertural view. 



4. Uvigerina angulosa. X 75. a, front view; 6, side view; c, apertural view. 



5. Uvigerina pygmzza. X 75. 



Plate 45. 



Fig. 1. Siphogenerina bifrons. X 75. a, front view; b, apertural view, microspheric 

 specimen. 



2. Siphogenerina bifrons. X 75. Megalospheric specimen. 



3. Siphogenerina dimorpha. X 75. a, front view; b, apertural view. 



4. Siphogenerina dimorpha. X 150. Later chambers by transmitted light. 



5. Siphogenerina bifrons. X 300. Outline of early chamber of microspheric 



specimen. 



6. Siphogenerina bifrons. X 75. Outline of megalospheric specimen by trans- 



mitted light. 



7. Siphogenerina bifrons. X 300. Later chambers by transmitted light. 



Plate 46. 



Fig. 1. Siphogenerina raphanus. X 40. Megalospheric specimen. 



2. Siphogenerina raphanus. X 40. a, front view; 6, apertural view, microspheric 



specimen. 



3. Siphogenerina raphanus. X 225. Outline of early chambers of microspheric 



specimen. 



4. Siphogenerina raphanus. X 75. Outline of megalospheric specimen. 



5. Siphogenerina raphanus. X 75. Later chambers by transmitted light. 



Plate 47. 



Fig. 1. Siphogenerina striatula. X 75. a, front view; b, apertural view. 



2. Siphogenerina columella? is. X 75. a, front view; b, apertural view. 



3. Siphogenerina columellaris. X 75. Specimen by transmitted light. 



4. Siphogenerina striata. X 75. a, front view; b, apertural view. 



5. Siphogenerina striata. X 75. Later chambers by transmitted light. 



6. Siphogenerina irregularis. X 75. a, front view; b, apertural view. 



7. Siphogenerina irregularis. X 75. Later chambers by transmitted light. 



