154 C. E. Beecher — Development of the Brachiopoda. 



Nepionic period. — Young shells before the appearance of dis- 

 tinctive specific characters. 



Nealogic period. — Progressive development of the specific fea- 

 tures which reach their complete growth in the adult. 



Ephebolic period. — Normal adult condition. 



(Teratologic period. — Special manifestations of old age in ontog- 

 eny and in phylogeny. 



Nostologic types. — Extremes of geratology represented by Cis- 

 tella, Gwynia, and Atretia. 



Yale Museum, New Haven, Conn., May 31, 1892. 



References. 



1. Beecher, C. E., 1891. — Development of the Brachiopoda. Part I. Introduc- 



tion. This Journal, vol. xli, April. 



2. Beecher, 0. E., 1891. — Development of Bilobites. This Journal, vol. xlii, July. 



3. Beecher, C. E. and Clarke, J. M., 1889. — The Development of some Silurian 



Brachiopoda. Mem. N. T. State Museum, vol. i, no. 1. 



4. Brooks, W. K., 1 879. — The Development of Lingula and the Systematic Posi- 



tion of the Brachiopoda. Johns Hopkins Univ., Chesapeake Zool. Lab.. 

 Sci., Results Session of 1878. 



5. Davidson, T., 1S51-18S5. — A Monograph of the British Fossil Brachiopoda. 



Pal. Soc. 



6. Deslongchamps, E., 1862. — Note sur le developpement du deltidium chez les 



brachiopodes articules. Bull. Soc. Geol. France, 2 e ser. t. xix. 



7. Fewkes, J. W., 1885. — On the Larval Forms of Spirorbis borealis, Daudin. 



American Naturalist, March. 



8. Hall, James, 1860. — Palasontology of Xew York, vol. iii. ■ 



9. Hyatt. A., 1888. — Values in Classification of the Stages of Growth and 



Decline, with Propositions for a New Nomenclature. Proc. Boston Soc. 

 Nat. Hist., vol. xxiii, March. 



10. Hyatt, A., 1889. — Genesis of the Arietidas. Mem. Mus. Comp. Zool., vol. xvi, 



no 3. 



11. Jackson, R. T., 1890. — Phylogeny of the Pelecypoda. The Aviculidse and 



their Allies. Mem. Boston Soc. Nat. Hist., vol. iv, no. viii. 



12. Joubin, L., 1886. — Recherches sur 1'Anatomie des Brachiopodes Inarticuh'-s. 



Archiv. Zool. Expdriinentale, 2 e ser. t. iv. 



13. King, W., 1850. — A Monograph of the Permian Fossils of England. Pal. Soc. 



14. King, W., 1859. — On Gwynia, Dielasma and Macandrevia, three new genera 



of Palliobranchiate Mollusca, one of which has been dredged in Belfast 

 Lough. Proc. Dublin Univ., Zool. Bot. Assoc, vol. i. 



15. Kovalevski, A. 0., 1S74. — Observations on the Development of Brachiopoda. 



Proceedings of the Session of the Imperial Society of Amateur Natural 

 ists, etc, held at the University of Moscow, 11th year vol. xiv. 



16. Lacaze-Duthiers, H., 1861. — Histoire naturelle des Brachiopodes vivants de 



la Mediterranee. Ann. Sci. Nat. Zool., t. xv. 



17. Morse, E. S., 1873. — Ou the Early Stages of Terebratulina septentrionalis 



(Couthouy). Mem. Boston Soc. Nat. Hist., vol. ii. 



18. Morse, E. S., 1873. — Embryology of Terebratulina. Mem. Boston Soc. Nat. 



Hist., vol. ii. 



19. Morse, E. S., 1873. — On the Systematic Position of the Brachiopoda, Proc 



Boston Soc. Nat. Hist., vol. xv. 



20. Miiller, F„ 1860. — Beschreibung einer Brachiopodenlarve. Archiv. Anat. 



Physiol., Jahrg. 1860. 



21. CEhlert, D. P., 1887. — Brachiopodes. Manuel de Conchyliologie, Paul Fischer. 



Appendice. 



22. Shipley, A. E., 1883. — On the Structure and Development of Argiope. Mitth 



Zool. Station Neapel, bd. iv. 



23. Walcott, C. D., 1888. — A Fossil Lingula preserving the Cast of the Peduncle. 



Proc. U. S. Nat. Mus. 



