240 EUPHROSYNE ROBERTSOM. 



ferior bristles are smooth, with the exception of a single small denticle near the apex. 

 Length 8 mm., breadth 2\ mm. 



It was dredged at Manger, about three miles north of Bergen, on shell-sand. 



There is still a degree of uncertainty in regard to the identity of the British and 

 Norwegian forms, which can only be cleared up by the capture of fresh specimens in this 

 country. 



3. ElTPHROSYNE ROBERTSONI, U. S. 



Specific Characters. — The tips of the branchiae are digitate, with only a trace of a 

 swelling. Dorsal bristles smooth and bifid. The forked and serrate bristles somewhat 

 resemble those of E.foliosa. 



Habitat. — From the Firth of Clyde, whence an example was sent to the British 

 Museum by the late Dr. David Robertson. It is labelled Euphrosyne foliosa, Aud. and 

 Ed., No. 1049, 64, 6, 30, 6. 



The specimen is upwards of half an inch in length, and shows a similar arrangement 

 of the caruncle and eyes to E.foliosa, from which, indeed, there is little to distinguish it 

 in external appearance with the naked eye. The branchiae, however, differ, presenting 

 stout stems, with dichotomously but sparsely divided tips, which have a nearly uniform 

 diameter ; for the slight enlargement in some does not alter their character as digitate 

 processes, slightly lobate and then tapered at the tips (Plate XXXV, fig. 4). They 

 somewhat resemble the figure of the branchiae of Euphrosyne myrtosa, as given in 

 Savigny's plate, but little reliance can be placed on it. 



The dorsal palisade of bristles x consists of smooth bifid forms, some with longer 

 (Plate XXXV, fig. 7) and some with shorter tips (Plate XXXV, fig. 6). The bifid 

 serrate kind (Plate XXXVII, fig. 33) appear to approach those of Euphrosyne foliosa, 

 though the curves and general character are different. 



I have named this species after one of the most persevering and patient of Scotland's 

 naturalists, who for many years devoted his energies and experience to the fauna of the 

 Clyde, and to whose influence and example the marine laboratory at C umbrae owes its 

 existence. 



Family II. — Aphroditim. 



Annelids of an ovate or oblong form, convex dorsally, with a distinct head 

 (prostomium), on which are a pair of eyes and a median tentacle, and under which 

 is a papillose facial tubercle. No lateral tentacles ; two palpi ; tentacular cirri long ; 

 buccal cirri (ventral cirri of the second foot) moderately long. Proboscis large and 

 powerful, with four thickened muscular ridges representing teeth, and tough internal 



1 I am indebted to Prof. Jeffrey Bell and Mr. Sumner for most courteously making preparations 

 of the bristles and branchiae and forwarding them for examination. 



