66 NATURAL HISTORY OF KERGUELEN ISLAND. 



the segments of the body after the third. But Grube states that in his 

 specimens they exist on twenty-nine to thirty-one segments, "fasciculi 

 setarum capillarium utrinque 29 ad 31." 



This genus, as thus emended, is characterized by having transverse 

 groups of simple cirriform branchiae on each side of the second, thirds 

 and fourth segments ; fascicles of setse commencing on the second branch- 

 iferous segment and extendingto about the thirty-second to forty-eighth j 

 uncini, commencing on the third setigerous segment; the tori, changing 

 to prominent papillae on the last setigerous segments, and as such ex- 

 tending to the posteror end. The cephalic lobe is short, semicircular^ 

 bearing on its front edge numerous tentacles, and on the narrow margin 

 behind the tentacles numerous minute, dark, ocelliform specks. 



The genus Streblosoma, Sars, is closely allied to Neottis, if not identi- 

 cal, but in the former ocelli were not noticed. 



ThelepuSjltenak.^and Thelepodopsis, Sars, are both closely related north- 

 ern genera, the latter differing only in having gills on but two segments, 

 while the former not only differs in the same way, but the fascicles of 

 setsB extend to the posterior end of the body. 



Neottis spectabilis, Verrill, s. n. 



Body moderately stout, much elongated; the tubercles bearing fascicles 

 of setae commence on the second branchiferous segment and exist on from 

 thirty-three to forty-four segments, the highest number occurring on a 

 very large specimen ; the size of the tubercles and the number and length 

 of the setae decreasing backward, so that the last tubercles are quite small, 

 with a few inconspicuous setae. The tori bearing the uncini, beginning 

 on the third setigerous segment, are low and elongated elliptical, extend- 

 ing downward to the ventral shields; farther back they become narrower 

 and more prominent, becoming quite narrow and elevated at about the 

 twenty -fifth setigerous segment, beyond which the same changes increase 

 at the last setigerous segment, and beyond, to the end of the body 

 they become still more prominent and papilliform, exceeding the last of 

 the setigerous tubercles ; of the posterior segments there are 30 or 

 more. On the second to the fifth setigerous segments there is a small 

 rounded papilla between the setigerous tubercles and the tori, on each 

 side. The ventral shields are not very distinctly defined in the alcoholic 

 specimens, especially the posterior ones, so that the number cannot be 

 accurately determined, but they are more numerous than usual ; the 

 anterior ones are short but transversely broad, with several deep trans- 



