372 Puget Sound Marine Sta. Pub. Vol. 1, No. 30 



margins long and somewhat concave, surface rough and beset with more 

 or less regularly arranged tubercles and hooked hairs; branchial region 

 rounded at the middle, marked by a prominent line of rounded tubercles; 

 the posterior lateral margin of the carapace with a row of rounded tuber- 

 cles beneath which is a row of hooked hairs; median line throughout 

 whole length consisting of varying elevations beset with groups of tuber- 

 cles. Carapace often covered with hydroids, algae and barnacles; merus 

 of chelipeds long, sub-trigonous, beset with tubercles which are particu- 

 larly prominent along the angle lines ; carpus somewhat roughened ; hands 

 compressed, usually with a granulated upper margin; fingers grooved, 

 smooth on the edges, their inner margins finely tootTied. Walking legs 

 subcylindrical, somewhat hairy; dactyls long, corneous tipped. Color of 

 carapace reddish gray; legs banded with stripes of red and gray, not so 

 noticeable in mature specimens. Red is present on the legs of mature 

 specimens, but does not extend to the tips except in the chelipeds. Body 

 much lighter on ventral surface. 



Found in 6 to 55 fathoms. They were secured in the following 

 places: between Turn Island and San Juan Island (10) in 6 fathoms; 

 channel north of Brown Island (2) in 11 to 13 fathoms; off Canoe Island 

 (6) in 20 to 30 fathoms; off northeast end of Brown Island (8) in 55 

 fathoms. 



Genus Chionecetes 



1. Chionecetes tanneri Rathbun. deep-sea spider crab (fig. 28) 



Rostrum very short, thick, bifid, curved slightly upwards at tip. Eyes 

 partially protected by orbit, toothed on ventral side. Carapace suboricu- 

 lar, very irregular with roughened tubercles; with few hairs; tubercles 

 smaller and more spine-like near the anterior; lateral margins spiny. 

 Chelipeds quite rough; hands rounded, with longitudinal rows of tubercles 

 on dorsal side, these not so evident on the ventral side; carpus rough but 

 tubercles not arranged in distinct rows, merus long, rough w-ith large spiny 

 tubercles on the inner edge at the distal end; fingers long, slender, light- 

 tipped, longer than the palm, grooved on ventral side from proximal end 

 to over one-half the length of dactyl, inner margins finely tubercled and 

 fitting close together. Walking legs very long, much flattened ; merus one- 

 half or more of the length of the legs, of the last pair rounded and the 

 whole leg very much smaller than the others. 



No specimens were secured during the summers of 1915 and 1916. 

 The description was made from a museum specimen which was not in very 

 good condition. Professor Kincaid saj^s that they have been secured in 

 Griffin Bay. 



