DESCRIPTIONS OF GENERA AND SPECIES 667 



this in shape is the Geoscolicid Sparganophilus. A more detailed description of 

 these cocoons will be found on p. 147. 



There is only one well-characterized species in this genus, viz. G. lacuum. 

 Oekley has described another under the name of C. dubiosus. Judging: from his 

 figures of this species (3, PL iii, fig. 9)— the text is in Magyar— the main difference 

 concerns the form of the prostomium, which is not so long as in C. lacuura, the 

 body, too, does not seem to be quadrangular in shape posteriorly. Rosa says 

 nothing about the species in his recent 'Revisione dei Lumbricidi.' 



Criodrilus lacuum, Hoffmeistek. 

 C. lacuum, Hoffmeistee, Die bis jetzt bek. Art. Regenw., 1845, P- 4^- 



Definition. Length, 300 mm. ; diameter, 6 mm. ; nuinber of segments, 400. Colour olive 



inclining to reel and green, yellow lelow. Setae strictly paired. Prostomium not very 



distinct from buccal segment, without a posterior process. Clitellum, XFI-L. Hal. — 



Germany; Italy. 



This species has been fully described, studied and illustrated by Vbjdovsky (24), 



Benham (4), Oeeley (4), Collin (1), and Rosa (12). Hatschek, Beegh (4), and 



Vejdovskt (15) have treated of its development. 



Genus Microchaeta, Pereiee. 



Syn. Lumbricus, AuCT. (in part.). 

 Antaeus, Vaillant (in part.). 



DBPliiriTioiJ'. Setae paired, rarely ornamented, sometimes absent from first few 

 segments. Spermathecae often numerous in each segment, placed in neighbour- 

 hood of gonads. Accessory glands with copulatory setae occasionally present. 



This genus was originally described by Rapp, who, however, regarded it as 

 a species of 'Lumbricus'; it was subsequently investigated by myself (7), and, 

 almost at the same time, by Benham (2) ; later, Benham (3) recorded a new species 

 of the genus, and, later still (8), two additional species; RosA (8) has described 

 a fifth species. 



The segmentation of the body is a little obscure, and has led to mistakes in 

 the location of various organs ; this has resulted from the fact that the setae are 

 very small and difficult to see, and that the segments are much annulated. Hence 

 the limitation of the segments has been a matter of difficulty. In the various 



4 Q 2 



