BRITISH NEMERTEANS, AND SOME NEW BRITISH ANNELIDS. 415 



bidentate apicial portion. The colours of this species are very beautiful, and it 

 is brilliantly phosphorescent. It appears to fall under Dr Malmgren's genus 

 Eusyllis, and to be most nearly allied to, though not identical with, his E. moni- 

 licornis. Another new British species, characterised by indistinctly articulated 

 tentacles and cirri, four very large and unusually distinct eyes, very short 

 bidentate apicial portions to the compound bristles, and the presence of long 

 simple hairs, seems to be the E. blomstrandi of the same author. It was dredged 

 in the Minch in 1865. 



Syllis krohnii, Ehlers,* var. ? — Found under a stone in a rock-pool at Paible, 

 North Uist, in a tube of sand. In this animal every alternate dorsal cirrus is a 

 third larger, more opaque, speckled with white dots, and, instead of passing 

 transversely outwards like the others, curves upwards in a very graceful fashion, 

 and is often coiled at the tip. The others are smaller, paler, also speckled with 

 white dots, and longer than the diameter of the body. The ventral cirrus is very 

 small. The bristles (Plate XVI. fig. 14) have a stout terminal portion, with an 

 entire claw at the apex, and the edge is serrated. The curves of the terminal 

 portion of the shaft are peculiar, and, in this respect, allied to Malmgren's Syllis 

 borealis,-\ from which, however, the animal is readily distinguished by the charac- 

 ters of the dorsal cirri, and the more elongated condition of the cephalic lobes. 

 Unless we are to mistrust the descriptions and figures of the dorsal cirri given 

 by Dr Ehlers, the British form varies very considerably from the typical one. 

 In no state were the alternate cirri club-shaped, and those of the third and fourth 

 segments were small and nearly equal ; whereas he shows them furnished with 

 a clavated pair, and all much more distinctly annulated than in the British 

 example. 



Syllis cornuta, Rathke. j — A Syllis, dredged off the Hebrides by Mr Jeffreys, 

 presents certain characteristics which point to its identity with the above-men- 

 tioned species of H. Rathke; and since it is doubtful (from the description at least) 

 whether Dr Jobnston's remarks § apply to this animal or not, I shall briefly 

 allude to its structure. The body, composed of fully 100 segments, is about an 

 inch in length, and of a highly iridescent aspect, from the close plaiting of the 

 fine muscular fibres. All the tentacles and cirri are moniliform. Each foot has 

 a dorsal cirrus, divided usually into twelve segments, a bristle-papilla, and a short 

 lingulate inferior lobe. The bristle-bundle is chiefly composed of the form b 

 (Plate XVI. fig 15), which at first sight resemble simple bristles, as their articu- 

 lating processes are usually hidden amongst the others. They have, however, a 

 most minute bidentate tip. Some (a) again have an extremely elongated ter- 

 minal process. Dr Malmgren's figure || represents the dorsal cirrus as furnished 



* Die Borstenwiirner, p. 234, taf. x. t Annulat. Polychseta Spetzbergias, &c. 1867. 



J Beitrage zur Fauna Norwegens, p. 164, taf. vii. fig. 12. 



§ Catalogue, &c. p. 192. || Annulat. Polychseta, &c. p. 43, taf. vii. fig. 45 c. 



