Annelids of Alaska —HARTMAN 
51 
all hooks of a series are thus held together 
firmly so that they function as units. One may 
liken the plate to a hand in which the broad, 
embedded part is the palm, and the distal free 
teeth the fingers. The teeth of the plate are 
extended at an angle slightly obtuse to the 
plate, or one might say that palm and fingers 
are at somewhat greater than right angles to 
each other. As a result, one cannot see both 
palm and fingers in full outline at any one time. 
The teeth, numbering usually nine (less often 
10) are nearly equal to one another in size; 
they are long and slender, with tapering, slightly 
curved tips; they project from the fleshy lobe of 
the neuropodium. In addition to these nine 
teeth, the lowest end of the plate has two addi¬ 
tional hooks, a smaller distal one, corresponding 
to the thumb of a hand, which is directed back¬ 
ward and ventrally, and a longer, more out¬ 
stretched one, comparable to an index finger, 
which is directed forward and ventrally. These 
two hooks constitute the locking mechanism, 
interlacing with similar hooks on the plates 
proximal to them. 
Abdominal parapodia have similar, though 
smaller, uncinial plates in notopodia, and one or 
two toothed setae in neuropodia. The abdo¬ 
men consists of 45 to 50 segments and termi¬ 
nates posteriorly in a pair of short, subspherical 
papillae below the anal aperture. 
C. occidentalis was originally described from 
Prince William Sound and later reported from 
Alaska (Moore, 1908: 362). Hyalopomatopsis 
occidentalis Moore (1923: 254), off Santa Rosa 
Island, California, may be another species (or 
genus) since the tube has not only a median 
carina, but the surface is wrinkled with trans¬ 
verse growth lines, and the collar setae are 
different. 
C. groenlandica Levinsen has also been re¬ 
ported from the northeast Pacific (Pixell, 1912: 
790, and Berkeley, 1930: 74). This differs from 
C. occidentalis in that the tube has not only a 
median carina, but also fine transverse striations 
and the special collar setae have a finlike por¬ 
tion that is set off from the main blade by a 
constriction. 
The present collections are from south and 
southwestern Alaska, from shore to 125 fm. 
Genus Dexiospira Caullery and Mesnil 
Dexiospira spirillum (Linnaeus) 
Serpula spirillum Linnaeus, 1767: 1264. 
Spirorbis spirillum Moore, 1908: 362; Pixell, 
1912: 796-797, pi. 88, fig. 8; Berkeley, 1930: 
74; Berkeley, 1932: 316; Berkeley, 1942; 
207. 
Spirorbis ( Dexiospira ) spirillum Fauvel, 1927: 
392-393, fig. 132. 
Collections. Stations 9-40 (many); 10-40 
(6); 25-40 (many); 52-40 (10). 
Tubes are attached to algae or hard objects. 
This species has been reported from inter¬ 
tidal regions of the northeast Pacific, including 
Alaska. The present records are well within 
known ranges. 
Genus Laeospira Caullery and Mesnil 
Laeospira borealis (Daudin) 
Spirorbis borealis Daudin, 1800: 145; Borg, 
1917: 22-26, fig. 5-11; Hartman, 1942: 
92-93. 
Spirorbis asperatus Bush, 1904: 245, pi. 28, 
fig. 10, pi. 30, fig. 4, pi. 41, fig. 4-6, 8, 10, 
11, 19, 31, 32, pi. 43, fig. 1-3, 7, 13, 26. 
Collection. Station 25-40 (several). 
These individuals come from Canoe Bay, in 
25 fm. Previous records are from Sitka and 
Prince William Sound, Alaska (Bush, 1904). 
Genus PARADEXIOSPIRA Caullery and Mesnil 
Paradexiospira violaceus (Levinsen) 
Spirorbis violaceus Levinsen, 1884: 202; Bush, 
1904: 242-243, pi. 41, fig. 1, 2; pi. 42, fig, 
8 - 12 . 
Spirorbis ( Paradexiospira) violaceus Fauvel s 
1927: 391-392, fig. 132, 
