1903.] NATURAL SCIENCES OF PHILADELPHIA. 451 



cula have been detected in the ventral part of the neuropodium as far 

 forward as the eleventh foot. Usually two occur, and they are slender, 

 not exceeding the larger compound setse in diameter, nearly straight, 

 slightly enlarged below the tip. which is bifid and provided with a 

 broad guard. 



Suruga Bay. 3.713, 45 fms. 



Onuphus cirrobranchiata sp. nov. (PI. XXV, figs. 60-63.) 



A rather small species, the type of which consists of 59 setigerous 

 somites, and measures 42 nmi. long, with a width of body at somite X 

 of 2.3 mm., and a maximum distance between the tips of the parapodia 

 at the same place of 5.2 mm. 



Prostomium small, about semicircular from above, the length aljout 

 equalling the peristomium at the sides. Eyes, 1 pair, reddish-brown, 

 circular, entirely exposed; frontal tentacles prominent, rounded, 

 length ^ length of prostomium. strongly divergent, directed forward, 

 downward and outward. Tentacles with short articulated bases, which 

 are httle longer than thick and about equal frontal tentacles in size , 

 each of 2-4 rings; styles slightly enlarged at base, long, slender, 

 smooth, entirely non-articulate; median longest, reaching somite 

 XIV, inner lateral XI, and outer lateral IV. Palpi short, thick, promi- 

 nent, slightly bilobed, strongly divergent from ventral surface of head, 

 and connected with ventral margins of lateral peristomial lobes by a 

 pair of ridges. 



Peristomium (which probably consists of two coalesced somites, the 

 first very small and anterior to peristomial cirri) longest laterally, there 

 equalhng the prostomium ; cirri directly in fine with eyes and far for- 

 ward, slender, tapering, short, scarcely reaching anterior boundary 

 of prostomium, and posteriorly to middle of somite III. 



Somite III (next to the peristomium) is nearly equal in length to 

 the prostomium and peristomium combined or to somites IV and V, 

 anterior margin much \\ider than posterior and projecting considerably 

 beyond any other anterior somite. Remaining somites well defined, 

 and of about equal size until the tapering posterior region is reached. 

 Body rounded, very little depressed, most so in the middle region when 

 distended with eggs, dorsum high and arched, venter flattened. Anus 

 terminal, the anal somite truncate and slightly crenulate ; caudal cirri 

 very long and slender, equalling the last 16 or 17 somites. 



Enlarged first pair of parapodia very prominent, nearly equalling 

 their somite in length, and projecting strongly forward by the sides of 

 the head, and slightly outward and downward; form simple, postsetal 

 lobe elongated, reaching slightly beyond tip of slender dorsal cirrus 



