38 RATHBUN 



PANDALUS GONIURUS Stimpson. 

 Plate I, fig. 3. 



Pandahis goftiicrns Stimpson, Proc. Acad. Nat. Sci. Phila., xii, 36 [105], 



i860. 

 Pandahis dapi/er MVRDOCK, Proc. U. S. Nat. Mus., vil, 519, 1884; Marine 



Invertebrates, in Rept. International Exped. to Pt. Barrow, Alaska, 141, 



pi. I, figs. 2-2C, 1885. — Rathbun, The Fur Seals and Fur-Seal Islands 



of the North Pacific Ocean, Pt. Ill, 557, 1899. 



Allied to P. horealis. Rostrum one and a half times as long as cara- 

 pace, terminal half ascending, posterior half horizontal ; armed above 

 with 8 to 9 movable spines, including 3 on carapace ; the anterior spine 

 behind middle of rostrum, the posterior spine in front of middle of 

 carapace ; lower limb deeper in front of eye than in P. borealis, and 

 armed with 6 or 7 immovable spines ; tip bifid, upper tooth smaller. 



Antennular flagella shorter than in P. borealis, the inner and longer 

 one being one and a half times as long as carapace. The spine at the 

 antero-lateral angle of the antennal scale extends nearly to the end of 

 the blade. Antennal peduncle falls a Httle short of end of second joint 

 of antennular peduncle ; flagellum nearly as long as body. 



Carpus of right foot of second pair divided into 18 to 20 articles; the 

 left foot nearly one and a half times the right and with 51 to 54 articles. 



The third segment of the abdomen possesses a lobe as in P. borealis, 

 but the lobe is blunt, not sharp ; the median line in front of the lobe is 

 nearly horizontal ; the posterior margin is only slightly produced back- 

 wards at its middle ; and it, as well as the fourth segment, is devoid of a 

 median spine. The sixth segment is a little shorter than in P. borealis; 

 seventh segment bears 5 to 6 lateral spinules. 



Otherwise as in P. borealis. 



Sometimes occurs with P. borealis, though an inhabitant of shallower 

 water. They are easily distinguished by the presence of spines on the 

 anterior half of the top of the rostrum in P. borealis and the absence of 

 the same in P. goniurus; and by the blunt rather than sharp lobe on the 

 third abdominal segment in the last-named species, as well as the 

 absence of median spines from the posterior margin of the third and 

 fourth segments. 



Dimensions. — Large female: Length 90 mm., length of carapace and 

 rostrum 41.5 mm., of rostrum 25.2 mm. 



Distribution. — Ranges from the Arctic coast of Alaska southward to 

 Okhotsk Sea on the one side and Puget Sound on the other, in 3 to 100 

 fathoms. Its occurrence below 50 fathoms is exceptional. 



Taken by the Albatross at the following localities : 



