426 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



liviug. Head small, promiuent, convex above, rounded laterally, nar- 

 rowed posteriorly and iu front ; the lateral lobes pass directly into the 

 basal article of the lateral antennte, while the base of the median one 

 is scarcely larger, and directly between them. Eyes blue, situated on 

 the convex lateral surfaces of the head : the anterior ones are a little 

 the larger, looking outward and slightly forward, the posterior ones 

 looking outward and backward. Antennae remarkably small, smooth, 

 acute ; the median one, with its base, is scarcely longer than the head ; 

 the lateral ones are about one-fourth shorter. Tentacular cirri also 

 small, the long one rather larger and nearly twice as long as the median 

 antenna, and exceeding the length of the head, smooth, with acuminate 

 tip. The other cirri are similar to the lateral antennee in size and ap- 

 pearance, and, like them, are tipped with dark pigment. Elytra are 

 borne on segments 1, 3, 4, 6, 8, . . . 22, 25, 28, &c. They are large, 

 broad-reniform, very thin and soft, translucent, perfectly smooth and 

 without fringe. Dorsal cirri well-developed, resembling the large ten- 

 tacular cirri in size and appearance, abruptly acuminate at the tip, and 

 scarcely smaller below it. Parapodia large and stout; setigerous lobe 

 of the lower ramus with two swollen lips, giving exit to a small upper 

 fascicle of slender, acute, sparingly serrulate, golden setse, and a few 

 lower ones, which are stouter and nearly smooth. Upper ramus repre- 

 sented by a small rounded papilla, without setae. Ventral cirrus small, 

 short, acute, tipped with brown. Ventral papilkie small, but distinct, 

 at the origin of the parapodia. Posterior segments and appendages 

 very small. Length 40 to 50™"^' or more. 



Lives among the tentacles of large actiuians {Bolocera Tuedice). 



Stations 870 and 880, in 225 and 252 fathoms, 1880, and at numerous 

 other localities in subsequent seasons, in 160 to 317 fathoms. 



Leanira robusta Verrill, sp. nov. 



Verrill, Trans. Coun. Acad., vol. iv, pi. 14, figs. 10, 10a, 10&. 



Verrill, Report U. S. Fisli Com. for 1883, pi. 41, fig. 173, 1885. 

 Body large, stout, tetragonal, resembling Leanira ietragona. Para- 

 podia with a large dorsal branchial lobe, rather longer than the setig- 

 erous lobe, from which it is separated by a rather wide interval, which 

 is covered by large cilia. Upper setigerous lobe rather small, lanceo- 

 late, nearly as long as the lower, with a short dorsal cirrus, and with a 

 superior cluster of slender cirriform processes. Lower setigerous lobe 

 much larger and broader than the superior one, blunt at the tip, with 

 a slender ventral cirrus, a large sui:)erior and a small inferior group of 

 cirriform processes. Dorsal setae very slender, a little enlarged and 

 spinulose on each side, near the end, and tapered to a very acute tip. 

 Ventral setae much stouter and somewhat longer, with a slender, taper- 

 ing, very acute terminal article. 



Stations 873, 87(5, 877, off Martha's Vineyard, in 100 to 126 fathoms, 

 1880, and at several other stations in subsequent years. 



