ISOPODS OF NORTH AMERICA. 



101 



exterior margin near tlie posterior extremity. The exterior margin 

 of this branch is also crenulate above and below the emarg-ination. 

 Below the emargination the inner ])ranch is narrow and posteriorly 

 ])ointed. The outer branch is half as wide as the inner branch, is 

 acutely pointed, and terminates in a single long spine. It extends as 

 far as the emargination in the exterior margin of the inner branch. 



Fig. 82.— Cirolana boekalis (After Harger) a, Last segment of abdomen with uropoda. x 6. 

 b, First leg. >; 8. c, Fourth leg. x 9. d, Seventh leg. x 9. 



The peduncle of the uropoda extends two-thirds the length of the last 

 abdominal segment. 



The first three pairs of legs are prehensile. In these legs the pro- 

 podus is armed with five spines; the carpus with one spine in the first 

 pair of legs and with three spines in the other two pairs; the merus 

 with ten spines in the last two pairs and with thirteen in the first pair; 

 at the distal extremity of the merus on the exterior side is a single 

 long terminal spine. The last four pairs of legs are ambulatory and 

 are beset with spines. 



CIROLANA BOREALIS Lilljeborg. 



Cirolana boreal!.^ Lill.iei?or(;, Ofvers. Vet. Akad. Fi'irh., 1851, p. 23. 



Cirokvui spinipeK Bate and Westwood, Brit. Sessile-eyed Crustacea, II, 1868, p. 



299.— Harger, Bull. Mus. Comp. Zool., Harvard College, XI, No. 4, 1883, 



pp. 91-93, pi. I, figs. 2-2d; pi. ii, tigs. 1-lc. 

 Cirolana horeali>i Hansen, Vidensk. Selsk. Skr. (6), V, 1890, pp. 321-322, pi. i, 



figs. 1-1 v.— Scott, Ann. Scottish Nat. Hist., 1898, p. 222.— G. O. Saks, Crust. 



