NO. 1701. 



NORTHWEST PACIFIC ISOPODS— RICHARDSON. 



85 



Genus SYSCENUS Harger. 



SYSCENUS INFELIX Harger. 



Syscenus infelix Harger, Report U. S. Commissioner of Fish and Fisheries for 

 1878, pt. 6, 1880, pp. 387-390 ; Bull. Mus. Comp. Zool. Harvard College, vol. 11, 

 1883, No. 4, pp. 100-102, pi. 3, figs. 5-5a ; pi. 4, figs. 3-3h.— Richardson, Proc. 

 Amer. Philos. Soc, vol. 37, 1898. p. 8 (footnote) ; Amer. Naturalist, vol. 34, 

 1900, p. 219 ; Proc, U. S. Nat. Mus., vol. 23, 1901, p. 524.— Norman, Ann. Mag. 

 Nat. Hist. (7), vol. 14, 1904, p. 437.— Richardson, Bull. U. S. Nat. Mus., No. 

 54, 1905, pp. 212-214. 



Harponyx pranzoides Sars, Forhandlungen 1 Videnskab Selsk. Christiania, 

 No. 18, 1883, p. 60 (young). 



Rocincla lilljcborgii Bovallius, Bihang. till Vetensk. Akad. Handl., vol. 10, No. 

 10, 1885, pp. 3-10, pis. 1-11. 



Syscenus Ulljeborgii Bovallius, Bihang. till K. Sv. Vet. Akad. Handl., vol. 11. 

 No. 17, 1886-87, pp. 17-18. 



Locality.— Station 5066, at Ose Saki, S. 52° E., 7.3 miles (lat. 35° 

 06' 05" N.; long. 138° 40' 20" E.). 



Depth. — Two hundred and eleven to two hundred and ninety-three 

 fathoms, in fine black sand. 



Remarks. — Only one imperfect specimen was collected. 



SYSCENUS LATUS, new species. 



Body 41 mm. long and 20 mm. wide at its greatest width. Thorax 

 broad, ovate; abdomen abruptly narrower than thorax, only 8 mm. 

 wide at the base, and becoming gradually 

 a little narrower from the anterior to 

 the posterior extremity. Surface of body 

 smooth. Color, in alcohol, yellow. 



Head nearly twice as wide as long, 

 4 mm. : 7 mm. Front of head triangu- 

 larly produced in the middle. Eyes en- 

 tirely wanting, but ocular swellings are 

 present, showing the position of the eyes. 

 Ocular swellings large and occupying the 

 entire lateral margin. The first pair of 

 antenna^ have the first two articles about 

 equal in length ; the third is twice as long 

 as the second ; the flagellum is composed 

 of thirteen articles and extends three arti- 

 cles beyond the peduncle of the second 

 antenna^. The second pair of antenna? 

 have the first two articles short and sub- 

 equal ; the third is a little longer than either the first or second ; 

 the fourth and fifth are long and subequal. each being about as 



Fig. 11. — Syscenus latus. X 

 1.3. (Drawn by Miss V. 

 Dandridge.) 



