408 DR W. CARMICHAEL M'lNTOSH ON THE STRUCTURE OF THE 



taper towards both ends, especially the terminal. The recurved fangs of the 

 latter are not always readily seen until the bristle is turned round. 



Lepidonotus pellucidus, Ehlers.* — Amongst the Lepidonoti dredged in Loch- 

 maddy, North Uist, in 1865, this peculiar species occurred. The head has two 

 rounded and prominent lobes in front, that do not form the acute angles seen in 

 the common species. The eyes of each side are placed close together, while the 

 pairs are widely separated, and situated far back. Ehlers 1 s description and 

 figures of the bristles need improvement. These structures throughout are pale 

 and translucent, the superior fascicle of the foot having a series of slightly curved 

 bristles (Plate XV. fig. 2, a), whose rows of secondary spines (about eight in 

 number) are very wide apart inferiorly, while the tip of the bristle is notched, as 

 if from a minute claw. Those of the ventral bundle are equally peculiar (b, same 

 figure), having a short but well-marked claw at the tip, with a small spike adjoin- 

 ing. The terminal portion is somewhat flattened, and marked by oblique rows of 

 secondary spikes, while it gradually widens inferiorly, and terminates in an 

 abruptly dilated shoulder, furnished with a projecting series of secondary pro- 

 cesses. The latter appeared to be similar to the spikes of the dorsal bristles, and 

 the intervening angle was filled with debris. Dr Ehlers does not discriminate 

 the bifid nature of the inferior bristles.f 



Polynoe longisetis, Grube4 a species described as British by Mr E. Ray 

 Lankester,§ under the name of Harmothoe malmgreni, though unfortunately, 

 owing to the engraver, its bristles have not been figured with anything like 

 recognisable accuracy, has been found after storms at St Andrews. It is 

 distinguished at once from L. cirratus (Harmothve imbricata) by the paler 

 and more resplendent bristles which flank its sides, by the structure and 

 greater pellucidity of its scales, and by the structure of its dorsal cirri. 

 The dorsal bristles are almost identical, except in length, with those of 

 H. imbricata; while the ventral, though formed on the same plan, characteris- 

 tically exceed those of the latter in the length of the terminal spiked portion 

 (Plate XV. fig. 3). The dorsal cirri (Plate XV. fig. 3, a) present scarcely any 

 swelling below the tip, are pale throughout, and have only a few pale warts, so 

 that the entire organ is much smoother than in the common species. P. longisetis 

 exhibits a very close affinity with Losnilla glabra, Malmgren. || 



Halosydna gelatinosa, Sars,^[ a species first found on the shores of Norway by 

 this celebrated naturalist, and afterwards by Kinberg** and LovEN,f f is abundant 



* Die Borstenwiirmer, &c. p. 105, taf. iii. fig. 5, 7-13, and taf. iv. fig. 1-3. 



t M. Claparede probably refers to this species (in his recent work " Les Annelides Chetopodes 

 du Golfe de Naples"), under the name of Herniadion fragile. 



§ Archiv fur Naturges. xxix. 1863. J Linnean Trans, vol. xxv. p. 375, tab. 51, fig. 28. 



|| Nordiska Hafs-Annulater, 1865, p. 73, tab. 9, fig. 5. 



•|f Beskrivelser og Jattagelser, &c. p. 62, pi. ix. fig. 25. 

 ** Kongliga svenska Fregatten Eugenies, &c. p. 19, taf. v. fig. 28. 

 fj" Cited by Malmgren, op. cit. p. 82. 



