4Ç0 Memoirs of the Indian Museum. [Vol. V, 1917.] 



" vas deferens " to that part of the duct in front of the covering of high peritoneal 

 cells; in the present case the cf vas deferens" would be almost, and in Rhizodrilus 

 kermadecensis (Benham, 2), where the covering begins immediately behind the funnel, 

 it would be altogether absent. Merely from a consideration of the present form, it 

 would seem pretty obvious that the whole duct from funnel to atrial chamber corre- 

 sponds to the "vas deferens" in the Tubificidae and Naididae generally ; but, as I 

 have said, comparative studies are necessary to settle the terminology. I hope the 

 terms I have employed are sufficiently non-committal to obviate any further con- 

 fusion. 



REFERENCES TO LITERATURE. 



(1) Benham, W. B. — Report on Oligochaeta of the Subantarctic Islands of New 



Zealand, 1909. 



(2) ib. Oligochaeta from the Kermadec Islands. Trans. New Zealand 

 Inst., vol. xlvii, 1914. 



(3) Ditlevsen, A. — Studien an Oligochaeten. Zeitsch. f. wiss. Zool., vol. lxxvii, 



1904. 



(4) Goodrich, E. S. — On the structure of Vermiculus pilosus. Quart. Journ. Micr. 



Science, n. s., vol. xxxvii, 1895. 



(5) Michaelsen, W. — Oligochäten von tropischen und südlichsubtropischen Afrika. 



Zoologica, Heft 67 u. 68, 1912-1913. 



(6) Moore, J. P. — Some marine Oligochaeta of New Zealand. Proc. Acad. Sei. 



Philadelphia, vol. lvii, pt. ii, 1905. 



(7) Nomura, E. — On the aquatic Oligochaete Monopylephorus limosus (Hatai). 



Journ. Coli. Sei. Tokyo, vol. xxxv, 1915. 



