HYPKRTB^E. 315 



ing from T. Ouirlnll, except that the small spinulcs on the distal 

 extremity of the inferior margin of the i)ropo{los are not figured 

 or described. Second i)air of gnatliopoda having the caqms Avilh 

 the superior margin depressed and the infero-anterior angle pro- 

 duced as far as the extremity of the propodos. First two pairs 

 of pereiopoda having the carpi sul)triangular ratlier than oval, as 

 described in T. antarct'ica and T. Oucrinii, and the propoda longer 

 than the cai-pi. In other points this species, whicli has been fully 

 and carefully described by M. Guerin-Meneville in the memoir 

 quoted, does not diifer from T. antarctica. 

 Length 9 lines. 



Hab. Coast of Malouines Isle, where it was taken by M. Gaudi- 

 chaud, after whom the species was named by the author. 



4. Theinisto arctica. (Plate L. fig. 11.) 



Themisto arctica, Kroyer, Gronl. Amjip. p. 63. pi. 4. f. 10. 

 Edicarch, Hist, dcs Crust, iii. p. 85. 



Superior antennce having the flagellum not annulate. First pair of 

 gnathopoda obtuse : second pair resembling the fii-st, not jire- 

 hensile. Carpus of the first two pairs of pereiopoda having the 

 inferior margin serrated. Telson acutely triangular. The rest of 

 the animal resembling T. antarctica. 



Bah. Greenland (Kroyer). In the stomach of a Seal at Port 

 Kennedy (Dr. Walker, Journ. R. Dublin Soc. 1860, p. 68). 



The above description is dependent for its correctness on those of 

 Kroyer and M. -Edwards. The figure is from Kroyer in the work 

 quoted. 



5. Themisto crassicomis. (Plate L. fig. 12.) 



Themisto crassieornis, Kroyer, Gronl. Atttfip. p. 67. pi. 4. f. 17. 

 Edwards, Hist, des Crust, iii. p. 85. 



Superior antennrc verj^ short, thick, biarticulate (?), and ciliated on 

 the border. Inferior antennte ha\'ing a flagellum that consists of 

 one short and one (terminal) long artieulus. First two pairs of 

 pereiopoda having the carjii subovate, smooth and unarmed along 

 the inferior margin. 



JJah. Greenland (Kroyer). 



As in the preceding, I am here indebted to the descriptions of 

 Kroyer and M. -Edwards. The parts figured are from Kriiyer's work 

 above quoted. 



