ANNELIDS. b'5 



loDg, slender, acute terminal piece. The lower ramus consists of a 

 smaller, subacute, lanceolate upper setigerous lobe, which is a little 

 longer than the upper ramus, and of a shorter, broad, stout, rounded 

 lower lobe, bearing the small, slender ventral cirrus at its base. The 

 set8B of the lower ramus form two groups, the uppermost consisting 

 partly of slender, acute setse, like those of the upper ramus, but longer, 

 and partly of somewhat shorter ones with a short, curved, bidentate 

 terminal piece. Farther back the form of the appendages changes 

 gradually, chiefly by all the lobes becoming more elongated and acute, 

 and by the gradual development of a special acute setigerous lobe on 

 the upper ramus. Toward the posterior end of the body the upper 

 ramus becomes more elongated than the lower, with a narrow, elongated 

 upper ligula with the elongated and slender dorsal cirrus arising from 

 a decided hump on the middle of the upper edge, and extending more 

 than half its length beyond the ligula ; and the lower lobe is also elon- 

 gated, lanceolate, obtuse, with a shorter, acute, setigerous lobe arising 

 from its upper side. The lower ramus consists of two lanceolate lobes, 

 the upper or setigerous one being about as long as the setigerous lobe of 

 the upper ramus, while the lower one is a little shorter. The setae are 

 arranged as on the anterior segments, but those of the upper ramus are 

 the longest; the ventral cirrus is very small and hardly one-fourth the 

 length of the dorsal one. 



Kerguelen Island, on the beach ; Dr. J. H. Kidder. 



It differs considerably from any of those known in the North Atlantic, 

 and would hardly go into any of the generic divisions proposed by Dr. 

 Malmgren. 



In the same bottle with this species, and probably made by it, there 

 was a curious nest, made of tough mucus threads, which inclosed nu- 

 merous small eggs in a long crooked band of many rows. The nest is on 

 the side of a flat alga, which is drawn together by the external looser 

 threads, as leaves often are by Tortrix larvae. 



KEOTTIS, Malmgren (emended). 

 Nordiska Hafs-Anuulater, in Ofversigt af Kong. Vet. Akad. Forhandlingar, 1865, 388. 



This genus was established for the Terebella triserialis, Grube,* from 

 Sicily, by Malmgren, but he states that he had only seen a mutilated 

 specimen, and, owing, doubtless, to this fact, he erroneously gave as one 

 of the characters of the genus the existence of fascicles of setae on all 



*Archiv. fur Naturgeschichte, xsi, 118, 1851, tab. iv, fig. 16. 

 5 K 



