British Tuhijicidx. By Rev. H. Friend. 291 



to set the matter at rest. I cannot, at present, refer it to Spiro- 

 sperma, notwithstanding the presence of papillae. It resembles in 

 some respects Embolocephalus mulfisetosus F. Smith. 



B. — Pectinate Setae with Capilliform in Dorsal Bundles. 

 IX. Genus Psammoryctes Vejdovsky. 



The generic characters have been fully discussed by all the 

 leading authorities — Vejdovsky, Michaelsen, Stole, Lankester, 

 Beddard, Benham, Eisen, and others. 



Psammoryctes harhatus Grube. 



Found in 1871 by Lankester, in brackish water at Barking, and 

 by Benham, in the Cherwell, 1892. Lough Xeagh is given by 

 Southern as an Irish locality. I have taken it frequently, and 

 think, with Benham (Q.J.M.S., xxxiii., pp. 208-9), that we may 

 eventually have to make some new species. 



X. Genus Spirosperma Eisen. 



Spirosperma ferox Eisen. 



My notes indicate the need of a revision and enlargement of 

 this genus. I therefore content myself here with recording the 

 type, which is widely distributed in Great Britain and Ireland. 

 Many synonyms tend to confuse the student, as Tubifej-, Felo- 

 scolex, etc. 



XL — Genus Tubifex Lamarck. 



If the setaj alone were considered, I should agree with Michaelsen 

 and some others in including Psammoryctes and Spirosperraa under 

 this genus. In any case we must, for the present, to avoid con- 

 fusion, distinguish those Annelids which have pectinate setse from 

 those which are destitute of them. The diagnosis of Michaelsen, 

 somewhat modified, will then be correct. We are thus able to in- 

 clude two species of British worms in this genus, as already de- 

 scribed, together with one new species. 



1. Tubifex tubifex Miiller. 



The type seems at present to have vanished into thin air ! After 

 all the various species which have been referred to under this head 

 are definitely resolved, we seem to have no worm left for the typical 

 Tubifex. I have at present no alternative but to copy the defini- 

 tion given by Michaelsen : — 



" Eeddish. Forked ventral setse, with upper tooth longer than 



