398 OLIGOCHAETA 



AUurus pupa, Michaelsen, JB. Hamb. wiss. Anst. vii, 1890, p. 10. 

 Eisenia pupa, Benham, Q. J. Micr. Sci., vol. xxxi, 1890, p. 266. 

 AUurus tetragonvirus, Fkiend, Sci. Gossip., Nov. 1892, p. 243. 



Defluition. Length, 30 mm. ; number of segments, 85. Tubercula puhertatis on XIX, 

 XX, XXL Hah. — Canada ; Wales. 



Friend's specimen was the larger ; Eisen gives 25 mm. as length, and counted forty- 

 segments. In ' AUurus tetragonurus ' the male pores are on xiii. 



Genus Allolobophora, Eisen i. 



DEPiiriTioir. Prostomium incompletely divides buccal lobe. Setae paired or more 

 distant. Male pores on XV. I^o median seminal reservoirs. 



The species of this genus vary chiefly in the position of the clitellum, tubercula 

 pubertatis, and in the number and position of the spermathecae. But unfortunately 

 ;he last-named organs are unknown in a considei-able number of species. In those 

 species in which they are known the number and position is given in the following 

 iable : — 

 [. Spermathecae absent. 



A. constricta. A. syriaca. 



A. eiseni. A. samarigera. 



1. Spermathecae, two pairs. 

 (a) In ix, X. 



(i) Opening near dorsal line. 



A. foetida. A. alpina. 



A. veneta. 

 {b) In X, xi. 



(i) Opening near dorsal median line. 



A. rosea. 

 (c) In ix, X. 



(i) Opening in front of setae 3. 



A. putris. 



' The synonymy of many of the species of this genus is so confused and intricate that the following 

 ages (nearly entirely derived from Rosa) claim to be no more than an approximation to a perfect 

 rrangement. 



