4ET.25 GENERA SIPHOGENERINA AND PAVONINA CUSHMAN 23 



EXPLANATION OF PLATES 



Plate 1 



Figs. 1, 2. Siphogenerina raphanus. Original figures. X30. Specimens from 

 "East Indian Seas." 

 3, 4. Siphogenerina raphanus. X40. Specimens from the North Pacific. 

 Figure 3, megalospheric; figure 4a microspheric; 46, end view. 



5. Siphogenerina raphanus, var. tropica. X66. Microspheric specimen. 



6. Siphogenerina raphanus, var. transversus. X35. 



7-9. Siphogenerina branneri. (After Bagg.) X23. From the Miocene- 

 Monterey shale of California. Figure 7, microspheric form, type 

 specimen; figures 8, 9, megalospheric forms. Figure 8, Sagrina 

 californiensis; figure 9, Sagrina elongata. 



10a, b. Siphogenerina striatula. X75. a, front view; b, apertural view. 

 From the North Pacific. 



11, 12. Siphogenerina irregularis. X75. Figure 11a, front view; b, aper- 

 tural view; figure 12, median section of last two chambers. From 

 off the Hawaiian Islands. 



13. Siphogenerina lamellata. X60. Miocene, one mile south of Red 

 Bay, Florida. 



14. Siphogenerina spinosa. (After Bagg.) X40. From the Miocene, 



Jones Wharf, Maryland. 



Plate 2 



Figs. 1, 2. Siphogenerina raphanus. X65. Figure 1, microspheric; figure 2, 

 megalospheric. Specimens from Samoa. 



3. Siphogenerina raphanus. X50. Megalospheric specimen from Tor- 



tugas region. Gulf of Mexico. 



4. Siphogenerina columellaris. X65. Specimen from the Philippines. 



5. Siphogenerina striata, var. curta. X65. Specimen from the 



Philippines. 



6. Siphogenerina bifrons, var. striatula. X65. Specimen from the 



Philippines. 

 7,^8. Siphogenerina virgula. X65. Specimens from Samoa. 



9. Siphogenerina dimorpha, var. pacifica. X65. Specimen from the 

 Philippines. 



10. Siphogenerina raphanus. X75. Later chambers by transmitted 



light, showing central tubes. 



11. Siphogenerina columellaris. X65. Microspheric specimen from 



Samoa. 



Plate 3 



Figs. 1,5_2. Siphogenerina columellaris. X 100. Sections. (After Silvestri.) 

 Figure 1, megalospheric; figure 2, microspheric form. 

 3. Siphogenerina columellaris. X75. Specimen by transmitted light. 

 4a, b. Siphogenerina columellaris. X75. a, front view; b, apertural view 

 Specimens from the North Pacific. 

 5. Siphogenerina dimorpha. X30. figure of type specimen. (After 

 Parker and Jones.) From the Abrohlos Bank, Atlantic. 

 6a, b. Siphogenerina dimorpha, var. pacifica. X65. a, front view; b, aper- 

 tural view. Specimen from the North Pacific. 

 7,1^8. Siphogenerina bifrons. X70. Figure 7, megalospheric, figure 8a, 

 microspheric form, figure 86, apertural view. Specimens from 

 off Japan. 

 9. Siphogenerina bifrons. X65. Specimen from the Philippines. 

 10a, b. Siphogenerina bifrons, var. sydneyensis. (After Goddard and Jen- 

 sen.) a. X 90; 6, showing pores and structure of wall. 



