PLATE XII 



dp:velopment and classification of 

 brachiopoda. 



GLOTTIDIA ALBIDA Hinds (Page 269) 



Figure 1. — Nepionic shell; Oholella stage. X 36. 

 Figure 2. — Neanio stage ; showing anterior growth producing Lin- 

 gula-Wke form. X 16. 



Figure 3. — Ephebic stage, x |- 



ORBICULOIDEA MINUTA Hall (Page 269) 



Figure 4. — Nepionic shell ; Paterina stage. X 36. 



Figure 5. — Neanic stage ; first holoperipheral growth. X 16. 



Figure 6. — Ephebic stage. X 10. 



LEPT^NA RPIOMBOIDALIS Wilckens (Pages 268, 269) 



Figure 7. — Nepionic stage, with short hinge. X 36. 

 Figure 8. — Early neanic stage, with radiating strise. X 10. 

 Figure 9. — Ephebic stage. X f • 



TEREBRATULINA SEPTENTRIONALIS Couthouy 

 (Pages 268, 269) 



Figure 10. — Nepionic stage, with open delthyrium. X 26. 

 Figure 11. — Early neanic stage, with radiating strise. X 16. (After 

 Morse.) 



Figure 12. — Ephebic stage. X |. (After Davidson.) 



