348 HABMOTHOE SETOSISSIMA. 



tentacle. The lateral antennas small. Forty segments. Scales whitish, obliquely ovoid; 

 sometimes spotted, with the entire margin ciliated. He points out that Savigny and M. 

 Edwards described individuals devoid of scales. Moreover he readily distinguished it 

 by its pale colour ; he thinks that Cuvier was wrong in saying Savigny found it at 

 Havre. 



Baird found it in tube of Ghaetopterus insignis from Beaumaris. 



This species was carefully described by Grube 1 from specimens procured at the 

 larger and smaller Lussins and at Crivizza. He noticed its relationship to P. setosissima 

 of Savigny, but the latter had shorter palpi and two additional papillae, viz. twenty, to 

 the border of the proboscis. He 2 says the specimens so named in the Parisian Museum 

 were Laenilla glabra, Mgrn., and Eva/rue impar. 



Malmgren's artist represents the anterior pair of eyes on the dorsum, and of the 

 same size as the posterior pair. 



The Polynoe laevigata of Claparede, from Naples, approaches this form ; indeed, there 

 is little to differentiate it. Claparede considered the P. tentaculata of De Quatrefages as 

 closely allied. 



In Prof. Pay Lankester's early remarks on this species the essential points were 

 omitted. 



Ehlers alludes to the variations of the scales exhibited by the specimens from 

 different depths in the ' Porcupine ' Expedition of 1869. 



Dr. Hansen's (1882) P. glaberrima appears to be this species. Unfortunately, while 

 placing comparatively little weight on the minute structure of the bristles, the 

 diagnostic characters relied on by this author would not appear to have been of much 

 avail. 



It is difficult to make out to what species Audouin and Milne Edwards' Polynoe 

 Ixvis is to be referred. Malmgren includes it under his Laenilla alba. Prof. Giard 

 (1886) considers that Polynoe laevis is not a variety of Polynoe setosissima, since the 

 scales in the former are smooth, whereas in the latter De Quatrefages distinctly says 

 they have a margin fimbriated all round, but he corrects himself in a subsequent 

 communication. 3 He does not think the P. laevigata of Claparede is this species. 



Hornell (1891) considers that it is the Laenilla glabra, Mgrn., and found it 

 invariably present in the tube of Chaetopterus in Herm. 



Baron de Saint- Joseph 4 (1898) in a recent paper doubts if Prof. Giard and I are 

 warranted in connecting this species with Savigny's form, which had lost its scales. 

 The description given by MM. Audouin and Edwards, however, though imperfect, comes 

 nearest this species. He also is doubtful about the inclusion of Claparede's P. laevigata 

 as a synonym, but there is no valid reason for altering the view already expressed. 



1 " Beschreibung neuer oder wenig bekannter Anneliden/' ' Arch. f. Naturges./ 1863, p. 37. 

 3 < Arch. f. Naturges./ 1870, p. 287. 



3 < Bullet. Sc. Nord/ pp. 340, 341. 



4 Op. cit., 1898, p. 236. 



