328 OLIGOCHAETA 



Enchytraeidae in general. The great length of the funnel (eight times as long as 

 broad) also distinguishes this species from any of its immediate allies. It resembles, 

 however, in this particular, F. subterraneus, with which it cannot be confounded, 

 owing to other differences. The anteseptal part of nephridium is short and broad ; the 

 postseptal part is oval, with a longer duct arising from its hinder extremity. The 

 glands of the epidermis are distinguished from those of P. nervosus and P. lineatus 

 owing to their being deeply stained with Picrocarmine. Michaelsen found no 

 giant-fibres in the nerve-chord, of which there are three in P. lineatus, but only one in 

 P. nervosus. The dorsal vessel arises at the end of the fourteenth or fifteenth 

 segment. 



(7) Pachydrilus minutus, 0. F. Mullee. 



Lumbricus minutus, 0. F. MtJLLER, Zool. Dan. Prodr., 1776, p. 216. 

 PClitellio minutus, Lutken, Kevised Cat. Annel., 1884. 

 Pachydrilus minutus, Lbvinsen, Vid. Med., 1883, p. 231. 

 Clitellio minutus, Vaillant, Annelds, p. 420. 

 Definition. Length, 14 mm.; number of segments about 24;' setae 12-14 per bundle. 

 Spermathecae with distinct duct beset with glands. Hab. — Greenland; Denmark. 

 This species would have had to be placed among the ' species inquirendae/ had 

 it not been for Leyinsen's description ; this rendered the distinctness of the species 

 beyond question. Its chief character is the very large number of setae in a bundle ; 

 this, coupled with the separation between the pouch and the duct in the spermatheca 

 enables it to be easily defined. The above synonymy is given on the authority of 

 Michaelsen. Vaillant retained the species of 0. F. Mullee in the genus OliteUio in 

 spite of the segments occupied by the elitellum. Levinsen does not query Clitellio 

 minutus of Lutken as a synonym. 



(8) Pachydrilus lineatus, O. F. Mullee. 



Lumbricus lineatus, O. F. MiJLLER, Verm, terrestr., 1. ii, 1774, p. 29. 



Nais littoralis var. mutica, O. F. Mtjllee, Zool. Dan., ii, 1788, p. 56. 



Saenuris lineata, Hofpmeistee, Arch. f. Nat., 1843, p. 195. 



Pachydrilus rivaUs, Levinsen, Vid. Med., 1883, p. 231. 



P. germanicus, Michaelsen, Ench. Mob., 1886, p. 43 et passim. 



P. lineatus, Michaelsen, Abh. Nat. Ver. Hamb., 1889, p. 23. 

 Definition, length, io mm.; number of segments ^o ; setae, ^-% per bundle. Copulatory glands 

 nearly meet above nerve-chord. Spermathecae without distinction betioeen pouch and duct ; 

 glands at base. Hab. — Germany ; Denmark 



