1148 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Genus EUSYLLIS Malmgren. 
Eusyllis tubifex Gosse. 
Fragments of specimens agreeing with McIntosh’s description of this species (McIntosh, Challenger 
Report, vol. xir, p. 190). 
Collected at station 4551, vicinity of Monterey Bay, Cal. 
Family HESIONM. 
Genus CASTALIA Sars. 
Castalia oculata, new species. 
Head roughly 4-sided, broader end in front. A pigmented depression in anterior median area 
(fig. 1). Eyes, two pairs, anterior ones very large, distinctly bilobed, the larger lobe anterior; posterior 
eyes less prominent, oval. 
Tentacles about as long as head, slender, tapering; palps with broad basal and slender terminal 
joints, about two-thirds as long as head. In the specimen figured they were curved down over the 
pharynx, and thus appear shorter. Proboscis when protuded (fig. 1 , p'.), with a median dorsal lobe 
lying just in front of the prostomium (fig. 1, m. /. ). 
Median portion of head with edges rounded. On either side from base of this rounding the surface 
slopes downward and outward to bases of tentacular cirri. These are 8 on a side, approximately equal 
in size. 
Somites, 17, with dorsal and ventral cirri, but the seventeenth without set*; dorsal cirrus long, 
with surface more or less regularly ringed, but apparently not a true jointing; ventral cirrus extending 
considerably beyond end of parapodium. 
Parapodium with large ventral and small dorsal lobe (fig. 2). Setae of former large, compound, 
with teeth at apex of terminal portion, and a row of minute denticulations along edge of latter (fig. 3). 
Basal portion with fine longitudinal lines running along it in an elongated spiral fashion; numerous 
transverse lines intersect these, dividing the surface into small quadrangular spaces; dorsal setae very 
long, slender, and sharp-pointed, with numerous parallel transverse lines throughout their greater 
portion. 
Length, 15 mm. ; width, without parapodia, 5 mm. Collected at station 4066, 176 to 49 fathoms, on 
a rocky bottom. 
Type no. 5200, U. S. National Museum. 
