70 NOTES ON THE MARINE OLIGOOH^TA OF PLYMOUTH. 



quantity of minute papillae, filled with a greyish-green pigment, 

 wliich. cover the body except at the anterior and posterior end, and 

 on the clitellum when developed. The opacity of the body walls 

 renders the contained blood-vessels less conspicuous. I identify 

 this worm with Claparede's species GUtellio ater ; it is probably 

 also identical with d'Udekem's* Tuhifex Benedii. 



The preliminary list of the Marine Fauna of Plymouth, published 

 in the second number of the ' Journal of the Marine Biological 

 Association,' contains a single Oligocheet — Tuhifex Uneatus. 



Tuhifex Uneatus is, however, a most mysterious species ; it was 

 originally described by Hoffmeister;t but there is nothing in Hoff- 

 meister's description which renders its identification possible, unless 

 he is right in stating (by implication) that there are no hair-like 

 setae in the dorsal fascicles ; in this case it cannot be a Tuhifex ; 

 but the generic name Soenuris, which Hoffmeister applied to it, 

 includes several species which are now assigned to different 

 genera. I should be inclined myself (at least provisionally) to 

 regard '' Soenuris Uneatus " as being the same form as GUteUio 

 arenarius, for in that Annelid also, as Claparede stated, there are 

 no hair-like setae. 



Another marine species, found on the coasts of the North Sea, 

 is Txihifex hyaUnus, d'Udekem. VejdovskyJ considers it probable 

 that this is a Limnodrihis, since it only possesses bifid setee. This 

 is, however, as already stated, no reason against regarding the 

 species as a GUteUio, inasmuch as all the species of Limnodrilus, 

 which have been adequately described, are fresh-water forms ; it is 

 more probable, though of course by no means certain, that Tuhifex 

 hyaUnus is a GUteUio, and perhaps also identical with Gl. arenarius. 

 Claparede was unacquainted with d'Udekem^s paper when he 

 described GUteUio arenarius. 



GUteUio also agrees with Limnodrihis in the presence of a pair of 

 " hearts " in each of segments 8 and 9. It is in fact only to be 

 distinguished from that genus by (1) the absence of ''prostate^' 

 glands, (2) the shortness and breadth of the vasa deferentia, and (3) 

 the structure of the spei-mathecEe, which are composed of two sacs 

 united by a very narrow tube ; in the lower sac lie the spermato- 

 phores. 



The species which Claparede termed GUteUio ater, and only very 

 briefly described, cannot be referred to the genus GUteUio at all. 

 The peculiar papillae, already referred to, distinguish the species, 



* Nouvelle classification, des Annelides Setigeres Ahranches, Bull. Acad. Roy. Belg., 

 T. xxii, Pt. ii (1855). 



t Die bis jetzt bekannten Arten aus der Familie der Regenwiirmer. 

 X System u. Morphol. d. Oligochaeten. 



