Pomona College, Claremont, California 9 
less segmented. A large quadrate membrance or flap projecting from anterior edge 
of peristomium forward over caudal region of prostomium. 
Genotype—H. californiensis sp. nov. 
Hesperalia californiensis sp. nov. 
Body rather stout for a syllid, more as in Hesionidae; broadest and deepest ante- 
riorly, continuously narrowing caudal to the pointed posterior end. The color of the 
dorsum is blackish, with pale transverse lines in the intersegmental furrows and 
bisecting each somite which under the lens thus appears double. Parapodia and cirri 
typically pale fulvous and the venter either similar or approaching the dorsum in 
color. Prostomium very short, sunk in the first body ring and almost completely 
overlapped by the quadrate flap from the latter, this flap extending over the bases of 
the tentacles in the type. Palpi stout, presenting two main lobes fused to their apices 
or nearly so, and on each of these an ectodistal lobe projecting ventrocephalad, these 
distal lobes wholly free from each other. Tentacles appearing nearly smooth; tapered; 
the median exceeding the lateral in length. Eyes large; in type orange colored; the 
two on each side contiguous or nearly so; posterior ones nearer together, each beneath 
edge of the quadrate peristonial flap, while the anterior ones are in line with base of 
median tentacle. Tentacular cirri of same form as tentacles but longer. Neurocirri 
thick, short, distally rounded. Natocirri long, filiform, tapering distad, weakly ringed; 
showing a tendency to alternate in height on the sides of the body, the first being 
notably farther duisad than the second, the third than the second and fourth, ete. 
Setae numerous; the appendage short, falcate, with tip simple, but a slender tooth 
near middle of curved edge. Segments short, crowded, near one hundred in number. 
Length of type, 21 mm.; greatest width, 2.2 mm. 
Type—M. C. Z. 2, 149. 
Taken in August, 1914. 
Hesperalia nans sp. nov. 
The type of this species is in the epitkous phase. The middle region of the body 
bears notopodeal fasciae of long, fine, simple, natatory setae in addition to the com- 
pound neuropodials. The appendage of the compound setae differs from that of 
californiensis in having the accessory tooth farther distad, well beyond the middle 
of the concave edge, whereas in the other species it is normally rather proximad of the 
middle. In the present species the prostomium is proportionately larger. less covered 
by the peristotmial flap which does not extend over the base of the median tentacle. 
The palpi are not fused so far distad, being unitd only at base; they present below 
on each a large distal lobe similar to that in the other species. Eyes with prominent 
lenses; large; those on each side sub-contiguous. Median tentacle in line with the 
centers of the anterior eyes; short and pointed, shorter than the width of the pro- 
stomium. Paired tentacles a little shorter than the median; each attached in front of 
the median at a point midway between the latter and the anterior eye. Tentacular cirri 
much longer than the tentacles, attenuated distad, pointed. The notocirri are all simi- 
larly attenuated and run out to a rather fine point. Neurocirri very thick, conical, 
each with a black dot near middle. Contrasting with the preceding species in color in 
having the dorsum in general light, fulvous, in part slightly dusky, with a series of 
dark, blackish, transverse lines across dorsum, there being four somites between each 
two dark lines. The body is narrowed toward both ends; venter flat and dorsum 
