386 ARKIV FÖR ZOOLOGI. BAND 1. 



The chelee on the first pair of legs are of a distinctly 

 unequal size (Pl. 20 fig. 7 — 10); the larger one being more 

 than half as long again as the dorsal side of the carapace, 

 including the rostrum. The length of the smaller chela is 

 about three-fourths of the larger one, which is between two 

 or three (the smaller chela three) times as long as it is 

 broad. Both of these chelae are strongly compressed. The 

 two sides of the basal portion of the propodite are nearly 

 parallel, and are furnished with an edge, which on the upper 

 side is provided with small saw-like teeth, directed forward. 

 The digital portion of the larger chela, not half as long as 

 the entire propodite, is armed with a large tooth or a protu- 

 berance on the granulated prehensible edge. The dactylus is 

 not as long as the basal portion of the propodite, and is pro- 

 vided with either two teeth, or one tooth, or is destitute of 

 teeth on the edge I have mentioned; the outer or opposite 

 edge is serrated. It is bnt a little curved toward the tip. 

 The smaller chela with the digital part of about the same 

 length as the basal portion. 1 ) 



On the upper side of the meropodite (merus), not far 

 from its distal end, there are to be found on the first cheli- 

 peds from one to three strong, sharp, and in some indivi- 

 duals behind these, some smaller spines. On the opposite 

 side of the merus we see one or two spines, situated more 

 posteriorly and, in addition (but not in all individuals) one 

 spine nearer to the distal end. 



The ischiopodite bears a spine on the under side near its 

 distal end and, behind this spine, a row of smaller spines or 

 teeth. 



The slender second pair of legs (Pl. 21, fig. 1) are of 

 about the same length as the dorsal side of the carapace, 

 their merus being about as long as the carpus and chela 

 taken together. In the middle — and in the case of one in- 

 dividual, near the distal end too — of the under side of the 

 merus there is to be found a spine, resembling that on the 

 same side near the distal end of the ischiopodite. The 

 chela is distinctly longer than the carpus; its digitus 

 and the digital portion of the propodus are of about the 



1 It was in two individuals only, that both chelipeds were available; 

 the left chela being the longer in the one specimen and the right being the 

 longer in the seeond. 



