478 OLIGOCHAETA 



MICHAEI.SEN states that in this species the spermathecae open in the intersegmental 

 groove viii/ix, whereas in the last species they open a segment in front of this ; there 

 is also a similar difference in the position of the calciferous glands, which in D. mimus 

 are situated in segments xiv, xv, xvi. The absence of penial setae distinguishes this 

 species and the preceding one also from the next to be described. 



(3) Dichogaster hupferi, MICHAELSEN. 

 D. Hupferi, MICHAELSEN, J. B. Hamb. wiss., Anst., Bd. ix, 1891, p. 66. 



Definition. Length, 180 mm.; number of segments, 250. Dorsal pores commence XVIII/XIX. 

 Penial setae present. Tour sacs of copulatory setae by t/ie sperm atliecae. Uab. W. Africa. 



This species is obviously different from the last ; but MICHAELSEN has been only 

 able to give a short account of it; he has figured the two kinds of modified setae 

 which are different in form, as in Typhaeus masoni, and in a species or two of 

 Acanthodrilus. The presence of copulatory setae near the spermathecae also recalls 

 the Acanthodrilidae. 



Genus DEODBILUS, BEDDAKD. 



DEFINITION. Prostomium absent. Setae strictly paired, truncated in form at the 

 free extremity and ornamented with minute spinelets, absent on the first five 

 segments of the body. Nephridia diffuse. Spermiducal glands lobate, with a sac 

 of penial setae 



This genus is represented by only one species ; it is not, therefore, possible to do 

 more than distinguish in a tentative fashion the generic from the specific characters. 



The two most marked features of the genus Deodrilus are, perhaps, the absence 

 of a prostomium and the form of the setae. In no other genus of Cryptodrilidae is 

 the prostomium aborted (or rather ' not yet developed,' should possibly be said in view 

 of VEJDOVSKY'S recent researches (9) ) I have stated its absence in Typhaeus ; but, 

 as BOURNE has found a prostomium in the species, T. masoni, described by himself, and 

 as ROSA also referred to the prostomium in the two species which he investigated, it 

 is probable that Typhaeus is not, as I first stated, without a prostomium. 



I have already commented upon the resemblance which this genus shows to the 

 Geoscolicidae in this character, as well as in other points. The setae of Deodrilus 

 are peculiar, as regards the Cryptodrilidae, in not having the regular sigmoid form ; 

 the extremity has a truncated appearance as if the end had been broken off; 



