20 IVAR TKÄGÄRDH, (Schwed. Südijohir-Exp. 



What Trouessart considers to be the third, ventral lobe of the collerettev is 

 in reality the median, basal part of the maxillae, which is demarcated from the end 

 of the maxilla; by a line or small fold.') 



The maxillœ (Text-fig. 34) are fused together \>y "/s of their 

 length; their free ends are short, conical, obliquely truncated at 

 the top; one pair of feathered hairs and, near the top, one pair 

 of very minute, perpendicular hairs. 



Ccplialothorax (PI. I, fig. 9). Near the front margin, in the 

 middle, are two horseshoe-shaped crests, with the concave side 

 turned backward. The cephalothoracic shield is separated from 

 the abdominal one by a rather deep groove, the ends of which 

 Fig- 34- R'Ktrum and ^j.^ curved forward; the edges of the shields bordering the groove 



left palp, of Tcitopen- . 



thalodes villosus (Trti ^'"^ thickened and on the cephalothoracic side regularly undulated, 

 ventral view. 207 ■ . There are three pairs of hairs on the céphalothorax; one pair of 

 feathered hairs in front of the anterior crests; another pair, larger, 

 near the lateral horns of the groove and the third pair, which is bare, is inserted 

 in deep pores near the centre of the shield. The third pair seems to be sense 

 hairs and homologuous with the bare shoulder hairs of T. arcticiis Tgdh which latter 

 also are inserted in deep pores. Abdomen; on the median shield near the lateral 

 sides 7 pairs of feathered hairs. 

 Locality: No. i, 2 and 5. 



Rhagidia Thorell. 



187 1. Rhagidia Thorell. 

 1886. N'orncria R. Canestrinl 



9. Rhagidia megalochela nov. spec. 



(PI. II, figs. II and 14, text-figs. 37, 40, 46 and 47.) 



Length. 1,1 mm. 



General shape like that of R. gigtis R. Can. 



The mandibles (PL II, fig. 14, text-fig. 37). 



The chela is enormously developed, attaining a little more than ',2 of the length 

 of the entire mandible. The lower jaw is strongly curved upwards for the greater 

 part of its length and narrows gradually from the base to the tip; the condylus is 

 narrow and does not widen at a right angle with the jaw as in R. gelida and R. 



') This basal part has been cut clean off during the preparation while on the dorsal side the 3-lobated 

 epirostral plate remained; thus the median lobe, the outline of which is nearly parallel with that of the 

 basal part of the maxillœ, was exactly covered by the latter and consequently if the tube of the micro- 

 scope is slightly lowered showed through and caused T.'s mistake. As I have been able to see the spe- 

 cimen from which T.'s figure is made, there can be no mistake about the above explanation. 



