114 MusEUM AND ArT NOTES

There are 14 to 17 spines extending to the middle of the rostrum, and usually a solitary spine not far behind the acute tip. The adults are fawn to bright red, but the younger individuals show a variety of colouration. Some are green, others brown, while yet others show the red of red algae and hydroids. This is evidently a form of protective colouration, enabling the young ones to escape detection amongst seaweeds and hydroids. The distribution as given by Rathbun (1904) is from Unalaska to San Diego, California. Young individuals up to 10 cm. in length are found in water of 10 fathoms or even less. Up to 18 cm. or so in length they are often taken in hauls with Pandalus borealis or Pandalus hypsinotus. The biggest specimens, how- ever, measuring 22 cm. from the tip of rostrum to the tip of the telson, are seldom found in water less than 75 fathoms deep. When adult they prefer a rocky bottom, but are often taken in trawls on a muddy bottom near rock.

Pandalopsis dispar. Rathbun.

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This species superficially resembles Pandalus borealis, but is easily distinguished by its long antennules and red and white striped abdomen. These stripes give the animal its common name of “side-stripe” shrimp. According to Rathbun (1904) it is the only species of Pandalopsis occurring in Southern British Columbia. The surface is finely punctate. The rostrum is two to two and a half times the length of the rest of the carapace. There are 16 to 21 dorsal spines which extend to the tip of the rostrum. Next to Pandalus platyceros these are the largest shrimps, and may even

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