392 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
JVephridial papillae very short, cylindrical, length and diameter 
about equal; begin at 8th and extend to 30th somite. 
Length (approximately) 23 mm.; width, including setae, 10.5 mm.; 
dorso-ventral thickness, 3.5 mm.; proboscis, 4 mm. 
A single specimen from Pleasant Beach, near Seattle, collected 
by Professor Ritter. It is chiefly notable for its great, overlapping 
elvtra, with tuberculation resembling the areolae of Ilarmothoe 
hirsuta , or of Iphionella. 
8. Harmothoe complanata sp. nov. PI. 2, figs. 8-13. 
Form of moderate length, flattened dorso-ventrally; breadth, in¬ 
cluding setae, two sevenths of length; number of somites, 36-38 ; 
elytra, 15 pairs, borne on somites 2, 4, 5, 7 .... 23, 26, 29, 32. 
Prostomium (Fig. 8) approximately six-sided, width and length 
equal, deeply incised for reception of basal joint of tentacle, indis¬ 
tinctly bilobed. Eyes four, minute, posterior pair dorsal, anterior 
pair dorso-lateral, and further apart than the posterior. Tentacle 
with short basal joint, which extends a little beyond the “ peaks ” of 
the prostomium, terminal portion nearly twice the length of the pro¬ 
stomium. Antennae very short, inserted below level of tentacle, 
two-jointed, less than one half the length of the prostomium. Palpi 
very thick at base, terete, gradually and uniformly tapering to an 
acute tip, barely papillate, as long as peristomial cirri. 
Peristomial cirri long and slender, gradually and uniformly 
tapered, without subterminal dark band, slightly papillate. 
Elytra (Fig. 10) thin, oval, translucent, with minute, scattered 
conical tubercles. • 
Parapodia (Fig. 9) long, rami distinct, finger-like tips long and 
slender. Dorsal cirrus like peristomial, long and slender, extending 
far beyond tips of setae, papillate. Ventral cirrus long, evenly 
tapered, papillate. Dorsal setae of two sorts : («) a supra-acicular 
fascicle of very stout, minutely serrated setae (Fig. 11) which are 
the thickest in the foot; they are arranged in a whorl, the shortest 
being the uppermost and most anterior; (5) a smaller tuft of very 
slender, elongated, serrulate setae (Fig. 12) inserted in the finger¬ 
like process; these are considerably longer than the preceding, and 
much fewer (4-5 in number). The ventral setae (Fig. 9) are 
arranged in a graduated series of which the uppermost closely re¬ 
sembles in length, slenderness, and serrulation the dorsal setae of 
fascicle b ; the middle and lower ones are of the more usual type 
(Fig. 13), with a series of “frills” near tip, beginning with very 
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