DESCRIPTIONS OF GENERA AND SPECIES 



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griseus, F. E. B., South America, 

 robustus, F. E. B., South America. 

 miehaelseni, F. E. B., South America, 

 papillosus, F. E. B., South America. 

 gracilis, F. E. B., South America. 

 corralensis, F. E. B., South America. 

 diversicolor, F. E. B., South America, 

 longiseta, F. E. B., South America, 

 elegans (Eisbn), California. 

 troyeri (Eisen), California, 

 benhami (Eisen), California. 

 monticola, F. E. B., New Zealand. 



(i) Microscolex modestus, Rosa. 



M. modestus, Rosa, Boll. Mus. Zool. Torino, vol. ii, 1887, No. 19. 



Deflnition. Length, 35-60 mm. ; number of segments, about 75. Setae in eight rows. 

 Nephridia commence in segment IF. Gizzard rudimentary. Spermathecae one pair 

 with a small diverticulum. Penial setae present. Testes in X, XL Sperm-duets open 

 on segment behind spermiducal glands. Hab. — Argentina ; Patagonia ; Italy (?). 

 The discovery of this species in the Argentine [Rosa, 6] renders it possible that 

 Italy is not its true habitat ; as a matter of fact there is a considerable traffic between 

 Genoa (in the neighbourhood of which the worm was first found) and the Ai'gentine 

 Republic — particularly in the way of emigrants. In addition to the points mentioned 

 above this species differs from the closely-allied M. dubius in the white clitellum 

 (instead of orange-coloured); it is morever, according to Captain Spegazzini, phos- 

 phorescent. Rosa has pointed out that in this case it is no longer possible to be 

 certain that the ' Lwmhricus phosphoreus ' of Duges is really identical with Photo- 

 drilusj it may well be the present species. 



(a) Microscolex dubius (Fletchee). 



Eudrilus (?) dubius, Fletchee, Proc. Linn. Soc. N. S. W., vol. ii {2), 1887, p. 378. 

 M. dubius, Rosa, Ann. Mus. Civ. Genova, vol. ix (2a), 1889, p. 511. 



Definition. Length, 50-70 mm.; number of segments, 11 0-120. Setae in eight rows, 

 ventral converging on genital segments. Nephridia commence in segment V. Gizzard 

 absent. Spermathecae absent. Sperm-ducts join spermiducal glands about half way 



