NOTOPHYLLUM FOLIOSUM. 49 



The ventral bristles (Plate LXXVII, fig. 21 a, b, c) spring from the tip of the lobe, 

 and they are seldom visible from the dorsum, even during the movements of the animal. 

 The shafts of the bristles have a distinct curve, and strise pass from the base of the 

 spikes for a short distance obliquely downward. On each side of the dilated end of the 

 shaft a series of short spikes occur, thus, as it were, embracing the base of the terminal 

 sabre, which is of moderate length and finely serrated at the edge. 



Reproduction. — Two female specimens, procured by my late friend Dr. Howden 

 of Montrose, at Lamlash, Arran, in August, were laden with mature eggs. 



The species is more sluggish than the ordinary examples of the Phyllodocidae, 

 and, when irritated, coils its body in a somewhat stiff manner. The colours, after 

 seven months' confinement in Perthshire, were considerably altered, the dorsal cirri 

 becoming much darker — brownish green, and the burnished-red iridescence was not 

 visible. 



Louis Page 1 shows that the nephridia proper of this form resemble generally those 

 of Eidcdia viridis, but that the solenocytes are studded with structures like palpocils so 

 that they are hirsute. 



A figure given in Montagu's MS. drawings (1808) in the library of the Linnean 

 Society (Plate LXIV, fig. 5) appears to refer to this species. Only three tentacular 

 cirri are observed on each side. Though thus early indicated, this form was not 

 recognized recently at the Plymouth Laboratory, being confounded with Eulalia. 



The early description of Sars (1835), as given in the ' Beskrivalser,' leaves little 

 doubt that this was the species before him, the only ambiguous feature, indeed, being the 

 outline of the inferior lamella (cirrus), a condition, however, probably due to the state of 

 the specimen. Even the ventral papilla internal to the latter is clearly shown. It would 

 be difficult to find any other form to answer the clear description of the author. 



CErstecl (1843), in his ' Conspectus,' apparently without a knowledge of the previous 

 paper of M. Sars, correctly separated the genus from Phyllodoce since it has a bifid foot. 

 He overlooked the fifth (median) tentacle, but he described the ventral mamilla of the 

 foot. There is little to separate his descriptions of Notophyllum viride and N longum, 

 and the somewhat elementary figures do not give much aid in this respect. His fig. 87, 

 Plate Y, however, clearly refers to N foliosum. 



In his earlier publication (' JNTordiska Hafs-Annul.,' 1865) Malmgren gave a good 

 description of the genus, improving on the brief account of (Ersted. He, however, did 

 not associate the N polynoides of the latter with the N foliosum of Sars, and, while in his 

 later publication (' Annel. Polychset./ 1867) he grouped the N longum of (Ersted with the 

 present form, he appeared to have doubts about the species originally described by Sars. 

 He had reasons for excluding Schuarda's Notophyllum 2 from his generic description. 



The Notophyllum japonicum of Marenzeller 3 appears to approach the northern species 

 very closely. 



The Trachelophyllum Lutheni of Levinsen (1883) is this species. 



1 c Ann. Sc. Nat./ 9 e ser. iii, p. 281, figs. 6 and 7, 1906. 



3 ' Wirb. Thiere/ ii, p. 87. 



3 ' Sudjap. Annel/ (op. cit.), p. 126, Taf. iii, fig. 1, 1879. 



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