no. 1701. 



NORTHWEST PACIFIC ISOPODS-, 



RICHARD SOX. 



103 



The first four pairs of legs extend 

 forward and are furnished with long 

 hairs; the last three pairs are ambula- 

 tory. 



Two specimens, a male and a fe- 

 male (the female is described and 

 figured) were collected at station 4778. 

 on the way from " Bowers Bank " to 

 " Petrel Bank," Bering Sea, at Semi- 

 sopochnoi Island, r. t. S. 45° W., 1. t. 

 S. 12° W., about 12 miles (lat. 52° 12' 

 N.; long. 179° 52' E.), at a depth of 

 43 fathoms in fine black gravel. 



This species is very close to Arctu- 

 rus glaber Benedict ° from Bering 

 Sea, but differs in the shorter and 

 more thickset body; in the shorter 

 second antennae; in the shorter ab- 

 domen, with the apex less pointed; 

 in the shorter fourth segment of 

 the thorax; and in having the three 

 longitudinal bands of yellow on the 

 body. 



This species is also similar to Arctu- 

 rus myops Beddard & from New Zea- 

 land. 



Type - specimen. — Cat. No. 39511, 

 U.S.N.M. 



ARCTURUS MAGNISPINIS, new species. 



This species is very close to Arctu- 

 rus longispinics Benedict, 0 so that a 

 complete description does not seem 

 necessary. It differs from that form 

 in having the tubercles of the first 

 thoracic segment replaced by small 

 spines; in having the third, fourth, 

 and fifth articles of the peduncle of 



a Proc. Biol. Soc. Washington, vol. 12, 

 1898, p. 46. 



6 Challenger Report, vol. 17, 1886, p. 100, 

 pi. 22, figs. 5-8. 



c Proc. Biol. Soc. Washington, vol. 12, 

 1898, pp. 44-45; Richardson, Bull. U. S. 

 Nat Mus., No. 54, 1905, pp. 329-330. 



Fig. 26. — Arcturus magnispinis. 

 X 2.4. Female. (Drawn by 

 Miss V. Dandridge. ) 



