24 8B Canadian Arctic Expedition, 1913-18 
One specimen of typical structure. Scars show the normal three pairs of 
branchiz to have been present in two separated groups; but only one branchia 
remains in place on the specimen at present. ; 
This is a primarily Arctic species of probably circumpolar distribution. 
It was previously known from the waters of Sweden, Spitzbergen, Greenland, 
Davis strait, Labrador, and New England. 
Ampharete johanseni, n. sp. 
Type specimen.—Cat. No. 39, Victoria Memorial Museum, Ottawa. 
Paratype, Mus. Comp. Zool., No. 2193. Two specimens. 
This species seems generally to be readily recognizable from the character- 
istics of the branchie. ‘The branchie of the two groups are only very narrowly 
separated at the middle line and the two mesal ones are connected at base by 
a rather high membrane. The first, second, and fourth branchie on each side 
counting from the most ectal, are in a transverse line and are of the same general 
size; but the third is crowded often a little caudad of the others and is charac- 
teristically much smaller in size, though varying considerably in the amount 
of its reduction. 
The pales number typically from nine to twelve on each side. Slenderly 
attenuated to a fine tip, but the latter not at all abruptly set off. (See Pl. V, fig. 1.) 
There are thirteen setigerous thoracic somites. The sete narrowly limbate 
and finely tipped as usual. The uncini have only four teeth in each series, the 
plate as a whole subquadrate, with the abdental edge evenly curved, not shoul- 
dered or angulate. (See pl. V, fig. 2.) ; 
' First’ abdominal uncinigerous tori large, with edges rounded, the others 
progressively reduced in going caudad. No cirri were detected on any of them. 
The type is 16 mm. long. A second specimen, which is incomplete caudally, 
is considerably broader. 
Locauity.—Alaska: off Collinson point. Station 27s. October 3, 1913. 
Depth, 3 fathoms. Bottom, mud and gravel, with alge. 
The tubes are composed of grains of sand adhering to a tough lining mem- 
brane. 
Ampharete reducta, n. sp. 
Type specimen.—Cat. No. 40, Victoria Memorial Museum, Ottawa. 
Paratype, Mus. Comp. Zool., No. 2192. Two specimens. 
A species somewhat suggesting A. arctica in the form of the palex; but 
the tips are much more elongate and less abruptly set off, not shortly mucronate. 
(See Pl. V, fig. 3.) Also the palee are only half or less as numerous as in arctica, 
the number in each group being five or six. The palex are obviously coarser 
than in johansent. 
The branchie have the ordinary general arrangement, but with the ectal 
one of each group caudad of the general line, in the type being almost caudad 
of the adjacent one. 
The usual fourteen pairs of fascaize of capillary thoracic sete. These sets 
limbate and finely tipped, as shown in PI. V, fig. 5. 
The uncini are of the same general type as in johanseni; but they are 
smaller and there are five teeth in each series in place of four and the end away 
from which the teeth are directed is less rounded, being slightly indented as in 
ey i but without so distinct an angle or shoulder as in the latter. (See pl. V, 
g. 4. 
Length, 20 mm. 
Locauity.—Alaska: off Collinson point. Station 27s. October 38, 1913. 
Depth, 3 fathoms. Bottom, mud and gravel with alge. 
Found with specimens of johanseni. The tubes of the two species are alike 
in‘structure and appearance. 
