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 i Videnskab Selsk. Christiania, 

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



Rocinela Ulljeborgii Bovallitjs, Bihang. till Vetensk. Akad. Handl., vol. 10, No. 

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



Syscenus Ulljeborgii Bovallitjs, 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 

 antennae 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 

 antennae. The second pair of antennae 

 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 



Pig. 11.- — Syscenus latus. X 

 1.3. (Drawn by Miss V. 

 Dandridge.) 



