266 W. B. BENHAM. 



sents it as a long, narrow tube, equal in diameter throughout, 

 and thrown into a number of curves. It ends in what he 

 regards as the coelomic funnel — " une sorte de houpe formee 

 par une serie de replis membraneux implantes sur sa portion 

 terminale libre/^ This I take to be in reality a tuft of loops 

 of the coiled tube, such as exists in the nephridium of Micro- 

 chseta (see my paper, ' Quart. Journ. Micr. Sci./ xxvi, pi. 

 xvi, figs. 21, 25, 26). It is possible that the Avide muscular 

 duct there figured might in an ill-preserved specimen shrink, 

 and have the appearance of such a duct as Perrier figures. 

 Perrier states that behind the twentieth somite the nephridia 

 are smaller and somewhat different from those anteriorly ; 

 such is also the case in Microchseta. 



The fact that the spermathecse in Microcheeta are very 

 small, and quite differently situated from what is the rule in 

 other earthworms, might be suggested in explanation of their 

 having been overlooked by Perrier. 



In Microchseta the dorsal vessel becomes doubled in 

 each of the Somites iv, v, vi, vii, and viii, and in the last is 

 very much thickened. In Ante us Perrier figures and describes 

 it as ampullate and bent aside in Somites xii — xvii, and does 

 not note any doubling. 



It would be exceedingly interesting to investigate more fully 

 the anatomy of An tens, for its locality, Cayenne, in Brazil, is 

 so far removed from the home ofMicrochaetaiu South Africa 

 that it seems scarcely credible that the two are identical. 



EiSENiA, Vaillant, 1889 ( = Tetragonurus, Eisen, 1874). 



Prostomium does not dovetail into peristomium. 



Setae in couples. 



Male pores in Somite xii. 



No further details are given. 



Species 1. E. pupa, Eisen, 1874; Canada, N. America. 



See Eisen, ' Ofvers af. Kongl. Vetensk. Akad. Forhandl.,' 

 1874. 



