DESCRIPTIONS OF GENERA AND SPECIES 329 



MICHAELSEN gives a much longer list of synonyms than that given above ; I have, 

 however, included all of his (excepting 'Gordius pallidua linea longitudinali rufa,' 

 O. F. MULLER, excluded because not binomial) that are not queried ; the principal 

 reason which led MICHAELSEN to identify MULLER'S species with that named by himself 

 P. germanicus is the exact correspondence of locality. 



(9) Pachydrilus litoreus, HESSE. 

 P. litoreus, HESSE, Z. wiss. Zool. 1893, p. 3. 



Definition. Length, 17 mm.; number of segments 40. Setae 5-6 per bundle. Copulatory glands 

 do not meet above nerve-chord (in XIII-XF). Hob. Naples. 



Genus MARIONIA, MICHAELSEN. 



Kyn. Pachydrilus, CLAPAREDE (in part.). 

 Enchytraeoid.es, ROULE. 



DEFINITION. Setae. /-shaped. Head-pore between prostomium and buccal segment; 

 no dorsal pores. Blood coloured ; dorsal vessel arises behind clitellum. No 

 salivary glands. Testes massive. 



The only difference that there is between this genus and Pachydrilus lies in 

 the form of the testes, which in Marionia are compact organs, not divided at the 

 free extremity into several lobes, as in Pachydrilus. Whether this character is 

 sufficient upon which to found a generic division is not quite certain ; in the 

 meantime, however, I adopt MICHAELSEN'S opinion. The five species allowed by 

 MICHAELSEN maybe distinguished as in the table; Marionia enchytraeoides ( = Enchy- 

 traeoides Marionii of ROULE) is considered by MICHAELSEN to be a 'species 

 inquirenda.' 



I. Gonads three or four segments in front of normal position . M. sphagnetorum. 

 II. Gonads normal in position. 



(1) Funnel of sperm-duct very long M. ebudensis 1 . 



(2) Funnel not specially long. 



i. Spermathecae with a thick covering of glands at base. 



(a) Spermiducal glands very large M. semifusca. 



(6) Spermiducal glands not so large M. crassa. 



ii. Glands at base of spermathecae small and few . . M. georgiana. 



1 This is only doubtfully a Marionia. 

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