DESCRIPTIONS OF GENERA AND SPECIES 313 



seems to have oesophageal glands as in Eenlea. The setae, disposed in a fan-like 

 manner, suggest an Enchytraeid, as also their small size. 



Lumbricus multispinus of Geube (7) (called Echinodrilus multispinus by Vaillant) 

 seems to be an Enchytraeid, as Vaillant (6, p. 89), has suggested. 



Lumbricus glacialis of Leidt (9), regarded by Michaelsen as belonging to this 

 group, is said to possess generative organs extending from the fourth to the eighth 

 segment. This does not read like an Enchytraeid. 



Michaelsen is, in my opinion, undoubtedly right in referring Enchytraeus 

 moniliformis (d'Udekem), Nais albida (Caktee), Lumbricus Jordani (Williams, 1), 

 and Enchytraeus juliformis (Kesslee), to this family. He is less certainly right in 

 doing the same with Saenuris abyssicola and S. limicola of Vebeill, Tubifex pallidus 

 (DuGEs), and Saenuris vagans (Johnston, 2). 



Enchytraeus sepultus of Menge, a fossil species from amber, is an undefined species. 



Lumbricus putridinis, synonymous, according to Johnston (2), with Enchytraeus 

 verm/iculus, only needs to be referred to for the sake of completeness. 



The number of species in this family is considerable ; the names that have been given to supposed 

 species is greater still. One hundred and three names are quoted in Michaelsen's Synopsis as 

 applicable, or which have been applied, to worms belonging to this family. Vaillant allows no 

 less than seventy-two of these in a way ; they are at any rate numbered and described in his work, 

 though he doubtless casts some question upon the reality of certain among them. Michaelsen 

 allows only sixty-one species (several of which are not included in Vaillant's work, as they have 

 been described since 1886) ; in addition to these sixty-one, he mentions twenty-nine which are 

 partly 'incertae sedis,' partly 'species inquirendae,' and partly ' species spuriae.' To the first category 

 are referred such species as can be defined specifically, but whose generic position is uncertain. To 

 the second category are referred those species which are insufficiently characterised, but which may 

 be subjected to renewed examination since the original types are extant, or since the description 

 given is enough with the locality to ensure recognition should they be again met with. To the last 

 category are referred a few species which are quite hopeless in these possibilities. Some of these 

 species have been dealt with in the pages which follow ; others may be suitably referred to here. 



The following five species are described by Eisen (13) under the generic name of ArcJii- 

 enchytraeus : — 



(i) Archienchytraeus tenellus. 



(2) „ Jevinsenii. 



(3) ,, lampas. 



(4) „ gemmatus. 



(5) „ ochraceus. 



Michaelsen says of these species that they are definable as species, but that it is uncertain 

 whether they belong to the genus Henlea or Enchytraeus. I am not able to elucidate the matter 

 any further, and therefore leave these species in the position in which Michaelsen placed them. 



About the following genera we require further information. 



s s 



