352 HARMOTHOE AKEOLATA. 



short smooth portion with, in many, a slight though distinct streak, best marked in the 

 shorter bristles, in which it forms a groove at the extremity. The external bristles (those 

 next the ventral division) form a contrast to the inner from their sharp tapering tips and 

 slight curvature. In the older specimens these bristles are often densely coated with 

 parasitic growths, such as algaB and infusorians, besides mud. The ventral branch has a 

 series of rather elongate slender bristles with tapering tips, which, as usual, diminish in 

 length from above downward. The tips superiorly are attenuate, and one or two show 

 no secondary process, but this soon appears, again to disappear, in the shorter inferior 

 forms. One of the attenuate superior bristles with a bifid tip is shown in Plate XXXIX, 

 fig. 18. The spinous rows are rather prominent. A shorter bristle again, with a slightly 

 abraded tip, is given in Plate XXXIX, fig. 19. Inferiorly the bristles have slender, 

 short, spinous extremities with a minute secondary process, and, at the ventral edge of 

 the series, the tips are simple. The nearly cylindrical papilla above the ventral spine is 

 well marked; and the ventral cirrus reaches beyond the base of the bristles, and has 

 somewhat slender clavate papillse. 



Comparatively little change ensues in the bristles of the terminal feet. The dorsal 

 are more slender and proportionally longer, so that they extend almost to the tip of the 

 longest of the ventral division. The ventral division has the same type of bristles as 

 in front, except that they are more slender. The elongated forms usually found in this 

 region were not observed, but the specimens may have been recently injured. The 

 papilla above the ventral spine continues to the last foot. 



The dorsal cirri are of two types, viz. those of the usual kind, with just a trace of a 

 dilatation below the elongated filiform tip, and densely coated with cilia, which are long 

 except at either end of the series ; and secondly, those with a greatly enlarged distal half, 

 so that the organ resembles a tennis-racket with the filiform tip appended to it, and 

 coated with cilia as in the first form. This condition of the cirri was first noticed by 

 Ray Lankester in specimens from Herm, for Grube's original ones had only the slender 

 cirri. No connection between the sexual or other condition of the specimens and this 

 state of the cirri has yet been observed. In one instance these enlarged cirri were found 

 in the tubes of Chastopterus, and were forwarded as parasites. 



Reproduction.— A specimen of good size from Herm carried ova at the end of July 

 and beginning of August. 



Habits. — Ray Lankester, who placed it as a new species under the genus Antinoe, 

 thought it fed on Terebella nebulosa, and I found some procured in Herm had fed on 

 Eunice and other forms. It would not always seem to be an inhabitant of tubes of other 

 annelids, but occurs in a free condition under tidal stones. De Quatrefages gave this 

 form a position near Harmothoe imbricata, but added nothing to Grube's remarks. 



G-iard (1886) includes it under the genus Evarne on account of the form of the head, 

 and the presence of chitinous protuberances on, as well as on account of the structure of, 

 the elytra. Yet the proboscis, the margin of the elytra, and the cirri present certain 

 characters which are almost sufficient to give generic distinction. 



De Saint Joseph (1888) seems to doubt my diagnosis in regard to Ray Lankester's 

 Antinoe nobilis, but it rests on a careful examination of specimens kindly sent me by 

 Lankester himself, and a survey of the same collecting grounds on the Channel Islands. 

 There is no doubt on the subject. 



