Annelids of Alaska—HARTMAN 
21 
c) in postmedian segments. The anal ring has 
a pair of short, blunt processes (Fig. Ad). 
This species is known from central California, 
shore, and western Mexico (Rioja, 1941: 687); 
the range is hereby extended to southwestern 
Alaska, from shore to 25 fm. 
Family SYLLIDAE 
Genus Typosyllis Langerhans 
Key to Species of Typosyllis 
1. Prostomium partly covered by a nuchal 
collar (Fig. 6 a) ...T. collaris 
1. Prostomium without a nuchal collar. 2 
2. Setae distally bidentate........ 3 
2. Setae distally entire.............. 5 
3. Anterior dorsum with a pigment pattern 
consisting of broken transverse lines.. 
..... J T. armillaris 
3. Dorsum without pigment pattern (pre¬ 
served) ... 4 
4. Superior setae in anterior segments with 
long appendage; articulation of setae 
complete...:...T. alternate* 
4. Superior setae in anterior segments 
with shorter appendage; articulation 
of setae incomplete.T. elongata 
5. Larger, 100 mm. long or longer; dorsal 
cirri short. T. stewarti 
5. Smaller, about 30 mm. long; dorsal cirri 
long.....T. pulchra 
Typosyllis alternata (Moore) 
new combination 
Syllis alternata Moore, 1908: 323-325, fig. a-f; 
Berkeley, 1923: 206; Berkeley, 1938: 37-38. 
Collections. 35-40 (1); Lazy Bay (4). 
Setae are entirely composite; this species is 
therefore referred to the genus Typosyllis. There 
are four atokous individuals, and a female 
epitokous stolon from Lazy Bay. Antennae and 
dorsal cirri are clearly articulate throughout. In 
the anterior region, dorsal cirri are about equally 
long, but thereafter they alternate long and 
short, the number of articles ranging from 25 
to 18. Ventral cirri are fairly long throughout. 
Setae are of a single kind, distally bidentate, but 
those in the superior part of the fascicle, espe¬ 
cially in anterior segments, tend to have long 
appendages. Superior and inferior setae from a 
postmedian segment are similar to anterior 
setae but somewhat thicker and have a shorter 
appendage. Acicula are yellow and distally 
knobbed. 
A female epitokous individual consists of head 
and 26 setigerous segments; swimming setae 
are present on all except the first segment. The 
prostomium is bilobed and has four reddish 
eyes. The anterior ones are much the larger 
and oblong in shape; they are antero-ventral in 
position and have elongate lenses; the posterior 
eyes are circular in shape. 
Syllis harti Berkeley (1941: 36) from British 
Columbia, Canada, also appears to be a Typo¬ 
syllis, since it is provided with only composite 
setae. It bears resemblance to T. alternata, but 
in the former the ventral cirri are even longer 
than in the latter, and the dorsal cirri have 30 
to 40 articles each. 
T. alternata was originally described from 
Alaska and has been reported from the north¬ 
east Pacific, south to southern California (Moore, 
1923: 256) and from western Mexico (Rioja, 
1941: 691). The present specimens are from 
southwestern Alaska. 
Typosyllis elongata (Johnson) 
new combination 
Pionosyllis elongata Johnson, 1901: 403-405, 
pi. 6, fig. 67-70, pi. 7, fig. 71. 
Syllis elongata Berkeley, 1923: 206; Berkeley, 
1938: 41; Berkeley, 1942: 190; Rioja, 1941: 
688 . 
Collections. Stations 12-40 (1); 20-40 to 
22-40 (1); 24-40 (1); 51-40 (5); 108-40 
(4); D 11-41 (1). 
This was originally described in the genus 
Pionosyllis because the palpi are partly fused at 
their bases. Berkeley (1938: 38) has ques¬ 
tioned the value of this character and I agree 
