PLATE XII 



DEVELOPMENT AND CLASSIFICATION OF 

 BRACHIOPODA. 



GLOTTIDIA ALBIDA Hinds (Page 269) 



FiGURK 1. — Nepioiiic shell; Obolella stage. X 36. 



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



gula-Wke. form. X 16. \ 



Figure 3. — Ephebic stage. X |- 1 



\ 

 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 !"• 



LEPTiENA RHOMBOIDALIS Wilckens (Pages 268, 269) 



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

 Figure S. — Early neanic stage, with radiating striae. X 10. 

 Figure 9. — Ephebic stage. X f- 



TEREBRATULINA SEPTENTRFONALIS Couthouy 

 (Pages 268, 269) 



Figure K). — Nepionic stage, with open delthyrinm. X 26. 

 Figure U. — Early neanic stage, with radiating striaj. X 16. (After 

 Morse.) 



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



