AXTINOE MOLLIS. 369 



latter figure representing one of the straighter forms next the ventral, while an outer 

 curved one is given in Plate XL, fig. 10. In contrast with those of A. Sarsi they are 

 longer, less curved, more acutely tapered at the tip, and with more closely arranged 

 spinous rows, and this is the case whether we compare them with adult or with young of 

 the same size. The ventral bristles, again, are decidedly stouter than in A. Sarsi, and 

 superiorly, instead of those with capillary tips, are bristles with a very long and delicate 

 portion of appreciable breadth, distinctly spinous, and ending in a slightly curved point. 

 The spinous rows continue nearly to the latter. The tips gradually (Plate XL, fig. 11) 

 diminish in length toward the inferior edge, and the spinous rows are closer. Some, 

 e. g. those from the south-west coast of Ireland, show a tendency to have long spines at 

 the tip as in Antinoe mollis (Plate XL, fig. 13), but the feature is indistinct. Young 

 specimens of A. Sarsi of the same size show the fine hair-like tips of the adult. 



The dorsal cirri have somewhat fewer cilia than in Antinoe Sarsi. 



This form seems to frequent deep water. It is probable that further observations 

 may show that it is only a variety of the foregoing, the points of difference between 

 them, and it may be other forms, being due either to epigamy or other sexual variation. 

 In the meantime the distinctive characters will ensure its ready identification. 



3. Antinoe mollis, G. 0. Sars, 1871. 



Specific Characters. — Head somewhat broader than long (in spirit), with blunt 

 anterior peaks. Byes larger than in A. finmarchica, the anterior pair being situated 

 laterally at the base of the peaks, and thus are not visible dorsally. The posterior pair 

 are separated by a wide interval from the anterior pair. The palpi show minute papillse 

 under a high power. Lateral tentacles with short clavate cilia. First pair of scales 

 rounded, rest ovoid ; outer and posterior borders with slender clavate cilia, which are 

 longest externally; entire surface closely covered with short, blunt, and rather soft 

 spines. Dorsal bristles rather large, long, slightly curved, less acutely tapered than in 

 Antinoe finmarchica, and with close rows of spines. Ventral cirri with short clavate cilia. 



Synonyms. 

 1871. Lsenilla mollis, Gr. 0. Sars. Viclensk.-selsk. Forhandl., 1871, p. 406. 

 1873. „ „ idem. Bidrag Christ. Fauna, p. 7, pi. xiv. 



1876. Antinoe mollis, Mcintosh. Trans. Zool. Soc., ix, p. 400, pi. lxxii, f. 3, 4. 

 1879. Lsenilla mollis, Tauber. Ann. Danic., 81. 

 1883. Harmothoe mollis, Levinsen. Xord. Annul., 191. 



Habitat.— Dredged on a bottom of muddy sand at a depth of 20 fathoms off Donegal, 

 and 370 and 420 fathoms at various points of the Irish coast in the ' Porcupine ' Expe- 

 dition of 1869. Dredged at 257 fathoms in the Expedition of 1870, in the Atlantic. A 

 similar form occurs in Norwegian waters, and Yerrill includes it in his American list. 



Head (Plate XXVIII, fig. 14), in spirit, somewhat broader than long, with blunt 

 anterior peaks. The eyes are larger than in the previous form, the anterior pair being 

 situated at the base of the peaks laterally, and thus are not visible from the dorsum, 

 as well as separated by a wide interval from the posterior pair, which are smaller, 



