BRITISH NEMERTEANS, AND SOME NEW BRITISH ANNELIDS. 410 



0. tubicola, a statement at variance with the characteristics of the present 

 species. The persistent brown stripes and spots also had not been seen by M. de 



Q.UATREFAGES. 



J&umenia jeffreysii, n. s. — This curious form, which I have been unable to 

 identify with any known species, occurred amongst the annelids dredged by Mr 

 Jeffreys off the Hebrides in 1866, and again amongst those from Shetland in 

 1867. The length is about li inch, and the outline of the body somewhat fusi- 

 form, the greatest diameter being at the anterior third. The head is small, fur- 

 nished with two short thick tentacles, which give it a bilobed aspect, and is gene- 

 rally retracted within the papillose anterior region in the preparations. The 

 mouth opens on the ventral surface just behind the snout. The structure of the 

 skin and the arrangement of the rugose annulations resemble the same parts in 

 Travisia, Scalibregma, Eumenia, and their allies ; but the animal essentially 

 differs from each of the foregoing in having no trace of branchial filament 

 or appendage. The tail has several elongated processes around the anus. The 

 ventral surface is in some cases marked by an elevated median line. There are 

 about thirty segments, each of which has three rings. A double row of isolated 

 papillae runs along each side from the snout to the tail, the summit of each process 

 giving exit to a fascicle of bristles composed of two kinds, viz., numerous long, 

 simple, hair-like bristles, tapering to a very fine point, and a shorter forked series 

 (Plate XVI. fig. 5). The only other case in which I have up to this time met 

 with such bristles, is in a remarkable fragment of the posterior end of a small 

 yellow annelid from Lochmaddy, which may have some relation to Montagu's 

 Nereis pinnigera. The foot had an elongated unjointed dorsal, and a shorter 

 ventral lobe, and possessed two fascicles of bristles, each of which consists of long 

 simple bristles, and a few of the forked kind mentioned above. 



There is much in the foregoing description that agrees with Eumenia crassa, 

 (Erst., but the absence of the branchial filaments is diagnostic. Dr Baird had 

 received this species from the same source, and kindly sent it, with other rare 

 and doubtful specimens, for my examination. He likewise recognised the absence 

 of the branchiae, and his preparation was labelled " E. ebranchiata(?).' n The 

 Vermiculus crassus of Dalyell* had no bristles, and cannot easily be recognised 

 from the description or figure. 



Chlorcemidw. — Two examples of this family have been recorded as British, 

 viz., Trophonia plumosa and Siphonostoma uncinata, both of which abound in Scot- 

 land. Another species of Trophonia, dredged by Mr Jeffreys in the Hebridean 

 and Zetlandic seas, is recognised specifically by the absence of hooks in the 

 inferior rows, and the substitution of the jointed bristles. It agrees with the 

 T. glauca of Malmgren ;| but this author does not specially point out the essen- 



* Op. cit. p. 88, pi. x. fig. 11. f Annulat. Polychset. etc. p. 82. 



