ISOPODS OF NORTH AMERICA. 



389 



FIG. 430. SYNI- 

 DOTEA NODU- 

 LOSA. MAXIL- 



LIPED. X 33. 



about twice as long as the second. The first antennae extend to the 

 end of the fourth article of the peduncle of the second pair of antennae. 

 The first two articles of the second pair of antennae are short and sub- 

 equal; the third and fourth are subequal, and each is 

 about twice as long as either of the two preceding 

 articles; the fifth is one and a half times longer than 

 the fourth. The flagellum is composed of six articles. 

 The second antennae extend to the middle of the second 

 thoracic segment. The maxillipeds have a palp of three 

 articles. 



The second, third, and fourth segments of the thorax 

 are subequal and each is a little longer than any of the 

 others, which are nearly subequal, the seventh being a 

 little shorter than the sixth. The epirnera of all the seg- 

 ments are firmly and perfectly united with the segments. 

 A faint longitudinal depression marks the place of coalescence on the 

 last three segments. Each segment has on either side a short distance 

 from the lateral margin a group of five or six low rugosities. 



The abdomen is composed of a single segment with a suture line on 

 either side at the base. It is 2 mm. wide by 3 mm. in length and 

 tapers to a pointed extremity. 



All the legs are similar in structure. 



SYNIDOTEA L^EVIS Benedict. 



Synidotea Isevis BENEDICT, Proc. Acad. Nat. Sci. Phila., 1897, pp. 399-400. RICH- 

 ARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 849; Ann. Mag. Nat. Hist. (7), 



IV, 1899, p. 269; American Naturalist, 

 XXXIV, 1900, p. 228. 



Localities. Between Bristol Bay and 

 Pribilof Islands, Alaska; Bering Sea. 

 Depth. 29i to 36 fathoms. From 

 sponges. 



Body narrow, elongate, 

 a little over three times 

 longer than broad, 4 mm. : 

 13 mm. Length of abdo- 

 men equal to a little more 

 than one-third the length 

 of entire body, 5 mm.: 

 13 mm. 



Head excavate between 

 the lateral angles, with 

 another median excava- 

 tion or notch. There is a 

 very low tubercle just below the median notch. The eyes are large, 

 round, and composite, and situated about the middle of the head at the 



FIG. 



431. SYNIDOTEA 

 BENEDICT). 



(AFTER 



FIG. 432. SYNI- 

 DOTEA L^VIS. 

 MAXILLIPED. 



X27j. 



