1903.] OLIGOCH^TA FROM NEW ZEALAND. 219 



its extent than would be supposed from the above scant statement. 

 For instance, I have picked out from Michaelsen's systematic 

 summary of the family, in ' Das Tierreich,' the following definite 

 statements, and these are the only ones that I can find : — 



Branchiura sowerhyi x. to xii. Beddard * . 



Tiihifex (Heterochceta) costatus « ^- ^° " ^^^^- Benham t. 



T. (P.)pUcaL.... I 'f- *^^"; Randolph.. 



T. (Spirosperma) ferox - x. to -xii. 



Tubifex hlanchardi (i^-) ^- and xi. 



Rhizodrilus (Vermiculics) pilosus x. to | xiv. Goodrich §. 



R.lacteus |x. to^xiii. F. Smith i|. 



Bothrioneuron americanum xi., xii. Beddard %. 



Clitellio arenarius x. to xii . 



Limnodrilus gotoi 2 x. to | xii. Hatai **. 



I have not at my command the earlier literature on the subject ; 

 but it is a curious fact that in neither of these monographs is 

 there a record as to the position of the clitellum in such common 

 European species as Tubifex rivulorum, Limnodrih(,s clapa- 

 redianus, &c. 



Tubifex sp. inc. 



From Lakes Taupo and Rotoiti some immature worms were 

 obtained which appear to belong to this genus. 



The dorsal bundle contains 2 to 4 long capillif orm chsetse together 

 with 2 to 4 " ctenates " ; the ventral bundle 4 crochets anteriorly, 

 dwindling to 2 posteriorly ; the two prongs of about equal length, 

 but the lower is rather stouter than the upper. In one instance 

 the capilliforms occur only in the first few segments, in other 

 cases (from Rotoiti) they are present throughout the body. Only 

 one chseta exists in the ventral bundles of segment x., and none 

 at all in segment xi. Commissural blood-vessels are present in 

 segments ii. to xi., those of the last two segments being very 

 long ; while in segment viii. is a large, much dilated " heart." 



Though these characters are insufficient to permit me to give a 

 name to the species, it appears to be different from T. rivulorum, 

 which species has been recorded by Beddard (1889) from New 

 Zealand. 



ENCHYTRiEUS siMULANS, sp. n. (Plate XXV. fig. 25 & XXYI. 

 figs. 26-28.) 



Seven short and relatively stout worms were amongst those 



* Beddard, Quart. Journ. Micr. Sci. xsxiii. p. 325. 



t Benham, Quart. Journ. Micr. Sci. xxxiii. p. 188. 



X Randolph, Jen. Zeit. xsvii. 



§ Goodrich, Quart. Journ. Micr. Sci. xxxvii. p. 253. 



II Smith, Bull. Illinois Lab. v. p. 244 



•^ Beddard, Ergeb. Hamb. Magalhaen. Sammelreise, p. 7. 



** Hatai, Annot. Zool. Jap. iii. p. 5. 



