112 SYNOrSIS OF AMERICAN FOSSIL HRACHIOPODA. [bull. 8?. 



Megatliyris, Endesella, Pteropbloios/riiecideii, etc. (ptyclioloplius type), 

 and (h) by looping (/ug,olox)bus) iind tlie growth of a median, unpaired 

 coiled arm (plcctolophus), as in Magellania, Terebratulina, etc.; in the 

 second (c) by the growth of two, separate, coiled extensions or arms, 

 one on each side of the median line (spirolophus), as in Lingula, 

 Crania, Discinisca, Ehynchonella, Lepttena, Davidsonia, Spirifer, Athy- 

 ris, Atrypa, etc. 



REFERENCES. 



1. Beecher, C. E., 1893: Revision of the families of loop-bearing Brachiopoda. 

 Trans. Conn. Acad., Vol. IX. 



2. Beecher, C. E., 1893: The development of Terehratalia ohaoleia Dall. Trans. 

 Conn. Acad., Vol. IX. 



3. Beecher, C. E., and J. M. Clarke, 1889: The development of some Silurian 

 Brachiopoda. Mem. N. Y. State Museum, Vol. I, No. 1. 



4. Beecher, C. E., and Charles Schuchert, 1893: Development of the brachial sup- 

 ports in Dielasma and Zygospira. Proc. Biological Soc. Washington, Vol. VIII. 



5. Brooks, "W. K., 1879: The development of Ijingula and the systematic position 

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



6. Davidson, T., 1851-1885 : A monograph of the Britishfossil Brachiopoda. Pal. Soc. 



7. Davidson, T., 1886-1888: A monograph of recent Brachiopoda. Trans. Linn. 

 Soc, London, Vol. IV. 



8. Fischer P., and D.-P. OShlert, 1892: Resultats des campagnes scientifiques 

 accomplies sur son yacht par Albert 1"', Prince Souverain de Monaco. Fs. Ill, 

 Brachiopodes de I'Atlantique Nord. 



9. Hancock, A., 1858: On the organization of the Brachiopoda. Phil. Trans., 

 Vol. CXLVIII. 



10. Kovalevski, A. 0., 1874: Observations on the development of Brachiopoda. 

 Proc. Imj). Soc. Amateur Naturalists, etc., held at the University of Moscow, llth 

 year. Vol. XIV. 



11. Morse, E. S., 1873: On the early stages of TerehratuUna septentrionaUs (Cou- 

 thouy). Mem. Boston Soc. Nat. Hist., Vol. II. 



12. Miiller, F., 1860: Beschreibung einer Brachiopodenlarve. Archiv Anat. 

 Physiol., Jahrg. 1860. 



