178 



WILSON. 



10. QuATREFAGES, M. DE. Histoirc Natu7'elle des Anneles. T. ii, 



Gephyreens. Paris, 1865. 



11. RiETSCH, M. Etudes sur les Gephyriens armes ou Echiuriens. Thesis, 



Geneva, 1886. 



12. Selenka, E. Challenger Reports. Vol. xiii. 1885. 



13. Shipley, A. E. Gepliyrea and Plioronis. Camb. A^at. Hist. Vol. ii. 



London, 1896. 



14. Shipley, A. E. On a Collection of Echiurids from Loyalty Islands, 



New Britain, and China Straits, with an Attempt to Revise the 

 Group and to Determine its Geographical Range. Zobl. Results, 

 etc. Camb. Univ. Press, pt. iii. 1899. 



15. Spengel, J. W. Ueber die Organization des E. Pallasii. Zobl. Anz. 



Bd. xl. 



16. Yerrill, a. E. Recent Additions to the Marine Invertebrata of the 



Northeastern Coast of America. Proc. U. S. Nat. Miis. Vol. ii. 

 1879. 



