342 OLIGOCHAETA 



11. Spermathecae with diverticula. 



i. Anteseptal part of nephridium no more than funnel. 



(i) Diverticula of spermatheca two I", leydigii. 



(a) Diverticula very numerous P. hegemon. 



ii. Anteseptal region large, with coiled duct, 

 (i) Glands at base of spermathecae. 



(a) One large gland P. dura. 



(b) Several glands P. ratzelii. 



(2) No glands at base of spermathecae. 



{a) Diverticula in the form of solid glands ... P. lobifera. 

 (6) Diverticula hardly developed P. callosa. 



(c) Two diverticula. 



(a) Setae paired ... . P. bisetosa, 



(/3) Setae 4-6 P. perrieri. 



(d) Four diverticula. P. galba. 



(e) Seven diverticula .... P. antarctiea. 



In two species of the genus the spermathecae are simple, without diverticula ; 

 in all the others these diverticula are present, and sometimes (in F. hegemon, for 

 example) extremely numerous. This recalls the peculiar ring, with occasional openings 

 into the spermatheca, which surrounds the spermathecae of BucUiolzia fallax. The 

 dorsal pores commence in the seventh ring; the perivisceral corpuscles are of two 

 kinds ; the larger are circular or more or less elliptical, the smaller i\raviceZZa-shaped. 



• (i) Fridericia striata (Levinsen). 



Enehytraeus striatus, Levinsen, Vid. Med., 1 883, p. 236. 

 P. striata, MiCHAELSEN, Abh. Nat. Ver. Hamb., 1889, p. 43. 



Definition. Length, lo-^ mm.; mimber of segments ^o ; setae, 6-8 jper bundle. Nejahridia with 

 large anteseptal part, in which lumen is coiled. Spermathecae without diverticula. Hah. — 

 Denmark ; Germany. 



This species has been described by Levinsen and by Ude (1). The former says 

 that there are sometimes nine setae in a segment ; this must result from the dropping 

 out of a tenth ; I give eight as the highest number in accordance with Ude's 

 statements. Sometimes, however, there are only four setae to a bundle ; in this case 

 the inner pair are about one-third shorter than, the outer. The colour of the 

 species (a greenish-grey) is said by Levinsen to be due to the presence of chlorophyll 



