Pomona College, Claremont, California 3 
each a slender tip above the moderate subdistal swelling about equal in length to 
the remaining part of the style. Tentacular cirri similarly formed, as is also the 
first neurocirrus, the latter less clavate below the slender tip. Other neurocirri much 
shorter, shortly subfusiform with filiform tip short; characteristically inserted almost 
precisely at middle of length of the neuropodium. Notopodia reduced to small lobes 
at base of neuropodia above, these lobes smooth, bearing no emergent setae in the 
type. In the average neuropodium the setae are mostly six in number; these are 
coarse, with subhastate heads the tips of which are curved, entire, and acute; the 
surface appears smooth, the seriate spinules being exceedingly minute and easily 
overlooked; pale straw colored: The notocirri have the usual enlarged distal end 
baring a-slender tip and a little exceed the neuropodial setae. The elytra have an 
arrangement in general similar to that normal in Halosydna so far as that usually 
goes, but twenty-four pairs are present, these occurring on somites, II, IV, V, VII, IX, 
XI, XIII, XV, XVII, XIX, XXI, XXIII, and XXVI, XXVIII, XXIX, XXXI, XXXIII, 
XXXV, XXXVII, XXXIX, XLI, XLIII, XLV, and XLVII. The elytra are character- 
istically widely imbricated so as completely to cover the dorsum and prostomium. 
They extend out far laterally so as wholly to overlap the parapodia proper though the 
ends of the setae and notocirri extend beyond the edges. The elytra have the surface 
wholly smooth and the edges are also not fringed. As preserved, the type has no 
definite color markings; color greyish, the elytra of weak fulvous cast. 
Length near 22 mm.; greatest width exclusive of parapodia, 2.8 mm.; to ends of 
parapodia, 5 mm.; to ends of setae, 6.8 mm. 
Taken as a commensal on a sea-urchin (Metz, July 20, 1911). 
Type—M. C. Z. 2, 140. 
Lepidonotus setosior sp. nov. 
Readily distinguished from L. sguamatus, coeloris and other species recorded from 
the Pacific coasts of North and South America by the greater length and coarseness 
of the notopodial setae, these being stout pointed spines often nearly attaining the ends 
of the neuropodials and thus exceeding the latter in actual length. The notopodials, 
however, are obviously more slender than the neuropodials; they are much more 
numerous than the neuropodials and form a dense, subcylindrical, spreading group. 
The elytra are characterized by bearing over their free portions numerous high and 
stout, conical, hard or chitinous tubercles which are, however, much less dense than 
the very different rounded eminences of sguamatus, these cones often roughened; be- 
tween these high cones, and over the covered part of the elytra as well, numerous small 
rounded tubercles or nodules; much more slender and shorter, erect, conical papillae 
present on the outer border of at least some of the elytra but no truly ciliate fringe 
could be detected in the types. The elytra are long, subelliptic in outline, and are 
arranged either with axis nearly longitudinal or very oblique, the most anterior elytra, 
however, subcircular. Eyes on each side unusually widely separated, the anterior one 
low on side, a little ectocaudad of base of anterior process. Anterior processes of 
prostomium about four-fifths as long as the median ceratophore and much more slender. 
Lateral tentacles much more slender than the median, and, exclusive of the fila- 
mentous tip, falling short of attaining the middle of the style of the latter exclusive 
of its tip; styles biannulate with black as frequent, the basal process also black. 
Median tentacle surpassing palpi in length; subapical swelling pronounced, much 
more so than that of the laterals. Tentacular cirri and notocirri similar in form to 
