1138 THE OLIGOCH^TA OF THE SPITSBERGEN EXPEDITION. 



(12) Ratzel, F. — Beitrage zur auatomischen und systematischen 



Kenntnis der Oligochaeten. Zeitschr, f. wiss. Zool. 

 xviii. 1869. 



(13) Stephenson, J. — On some littoral Oligochseta of tiae Clyde. 



Trans. R. Soc. Edin. xlviii. 1911. 



(14) Stephenson, J. — Oligochseta, in Fauna of the Chilka Lake. 



Mem. Ind. Mus. v. 1915. 



(15) Stephenson, J. — On some Indian Oligochseta, mainly from 



Southern India and Ceylon. Mem. Ind. Mus. vi. 1915. 



(16) Ude, H. — Beitrage zur Kenntnis der Enchytrgeiden und 



Lumbriciden. Zeitschr. f. wiss, Zool. Ixi. 1896. 



(17) Ude, H. — Die arktischen Enchytrjiiden und Lumbriciden, 



sowie die geographische Yei'breitung dieser Familien. 

 in Fauna Arctica, vol. ii. Jena, 1902. 



(18) Welch, P. S. — A new Henlea (Enchytrfeidse) from ISForthern 



Michigan. Trans. Amer. Micr. Soc, xxxiii. 1914. 



(19) Welch, P. S. — Studies on the Enchytraeidfe of North 



America. Bull. Illinois State Lab, Nat. Hist. x. 1914. 



(20) Welch, P. S. — Snowfield and Glacier Oligochseta from Mt. 



Rainier, Washington. Trans. Amer. Micr. Soc. xxxv. 

 1916. 



(21) Welch, P. S. — Alaskan Glacier Worms (Oligochseta), 



Bionomical Leaflets, McGill Univ., Montreal, no. 2, 

 1917. 



(22) Welch, P. S. — Report on the Canadian Ai-ctic Expedition 



1913-1918. Vol. ix. part A: Oligochasta — Enchy- 

 trteidaj, 1919. 



(23) Welch, P. S. — The Genera of the Enchytrseidse (Oligochseta). 



Trans. Amer. Micr, Soc, xxxix, 1920, 



