F. TRYBOM, TWO NEW SPECIES OF THE GENUS EUCONAXIUS. 387 



same length as the basal portion. Both edges of the cheke 

 and the carpus, and the under side of the nierus, are provi- 

 ded with ]ong hairs. 



Of the non-chelate legs, the third and fourth pairs are 

 slenderer and longer than the second pair; the fifth pair are 

 still more slender and are of about the same length as the 

 second pair. 



In the eggbearing feniale, the genital openings on the 

 bases of the third pair of thoracic legs (Pl. 20, fig. 13) were 

 verv plainly to be seen. In the other females these openings, 

 like the genital pores (the apertures of the väsa deferentia) 

 on the bases of the fifth pair of feet in the males (Pl. 20 

 fig. 14) require to be very well lighted to be observed. 



The abdomen is nearly as broad as the carapace; its first 

 segment being much narrower than the following ones. The 

 posterior margin of the sixth segment is considerably shor- 

 ter than the broadest part of tlie segment. The abdomen 

 with the telson is much longer than the, dorsal side of the 

 carapace including the rostrum. The pleurae of the second, 

 third, fourth and fifth abdominal segments are rounded 1 , that 

 of the second segment (Pl. 21 fig. 4) being much longer (in 

 the direction of the length of the corpus) than the other 

 pleurse. 



As regards the shape of the lamellae of the flapper and 

 of the telson see Pl. 21 fig. 8. The telson is from one- 

 fourth to nearly one-third longer than the sixth abdominal 

 segment, and about as broad as the posterior margin of this 

 segment. The sides of the telson are nearly parallel. Where 

 the first third of the sides ends, there is an impression from 

 beneath. which gives the said part of the sides of the telson, 

 seen from above, the shape. nearly of a long lobe. Between 

 the said impression and the posterior margin of the telson 

 each side is armed with about four small spines. The said 

 margin is rounded and is usually provided with a little spine 

 in the middle, where the longitudinal central furrow on the 

 dorsal side ends. This furrow extends över about two-thirds 

 — or a little more — of the length of the telson. On the 



1 As regards the abdominal pleurae there is a large difference for in- 

 stance between Axius crista-galli Faxon (plate XXVIII, fig. 1) on the one 

 and Euconaxius coronatus, Axius stirhynchus Leach and other species on 

 the other side. 



