Museum anp Art Notes aS

rostrum is trifid. The distribution, as recorded by Rathbun (1904) is from Sitka,
Alaska, to San Francisco, California, at depths of 10 to 97 fathoms. As a matter of
fact, small specimens about 5 cm. in length or less may be found in water only a few
feet in depth. None large enough to be commercially valuable are taken, however,
in water less than 12 fathoms deep, and they are rarely found at a depth greater than
30 fathoms. They live on a gravelly or sandy bottom where the striped shell forms a
protective colouring, especially marked in the case of the younger individuals, A
full-sized adult measures about 12.5 cm. or 5 in. from the tip of the rostrum to the
tip of the telson.

Pandalus borealis. Kroyer.
later like bic. 3:

This is the “pink” shrimp of commerce, and is also common in Norway, where it
is much fished. It is rather a slender form with the surface of the body smooth and
naked. The rostrum is about one and three-fourths times as long as the carapace,
slightly arched above the eyes, terminal half slightly ascending, armed with 21 to 16
teeth above, tip bifid. The anterior dorsal spine is situated at least as far forward as
the distal third of the rostrum. The shell is somewhat thin, making it more difficult
to transport in good condition than the other forms. Moreover, although a deep red
when alive, this shrimp becomes pink after boiling, a quality which also detracts from
the commercial value. In some places it occurs in great quantity and might be very
useful shelled and canned, when the above undesirable features would not appear. The
distribution is circum-polar. On the Pacific Coast it occurs from the Behring Sea to
the Columbia River. According to Rathbun (1904) they are found from 294 to
350 fathoms, but they are usually fished at about 35-60 fathoms. They live on a
muddy bottom with very few rocks, and may attain a length of 15 cm. or 6 in.

Pandalus hypsinotus. Brandt.

Pileyice IL Teheg, «Ms

9 66

This is variously known as the “king,” “rose,” or “hump-backed” shrimp. The
body is stout, the rostrum a little longer than the carapace, which is strongly arched
dorsally. There are 17 to 22 dorsal spines which occupy the anterior three-fifths of
the carapace, and extend an equal distance on the rostrum. The distal portion of the
rostrum is strongly ascending and unarmed, except at the tip, which is oblique and
armed with three immovable spines. The red colour, with irregular white stripes and
blotches, tends to become deeper on cooking. According to Rathbun (1904) these
shrimps occur from the Behring Sea to the Strait of Juan de Fuca, in 3 to 20 fathoms.
However, near Vancouver, they are usually fished in about 60 fathoms, and are fre-
quently taken with Pandalus borealis. They are found on a sandy or rocky bottom,
where the striped shell would form a good protective colouring as it does in Pandalus
danae. The size is slightly larger than that of Pandalus danae, reaching 13.5 cm.

Pandalus platyceros. Brandt.
Plate II. Fig. 4.

This form is the “prawn” of British Columbia, though it is sometimes also called
the “giant” shrimp. The body is stout, the carapace covered with a dense short
pubescence. The rostrum is one and a half to one and two-thirds times the carapace.