F. TRYBOM, TWO NEW SPECIES OF THE GENUS EUCONAXIUS. 391 



The chelate second pair of legs closely resembles that of 

 Euconaxius coronatus. 



On the first abdominal segment is a pair of rudimentary 

 one-jointed feet, without "terminal plates". The presence of 

 these feet does not constitute any sexual difference. 



The second pair of abdominal feet resembles that of the 

 males of Euconaxius coronatus. 



Judging from other species of the genera Axius and 

 Euconaxius, and from the nearly allied genera Calocaris and 

 Calastacus — as for instance from Axius {Euconaxius) crista- 

 galli Faxon — the very different shape of the larger foot of 

 the first pair should be sufiicient to constitute Euconaxius 

 crassipes as a species, distinct from Euconaxius coronatus. 



The male specimen mentioned I obtained from a depth 

 of about 220 meters in the Kosterfjord (Bohuslän) Aug. 12th 

 1901. It has a length of 46 mm. (the dorsal side of the 

 carapace including the rostrum 17 mm., abdomen with the 

 telson 29 mm.). 



Axius nodulosus Meinert, which — as I have already 

 mentioned — belongs to Scandinavian waters, differs according 

 to the description made by Meinert from the two species de- 

 scribed in this paper in not having any spines on the ventral 

 part of the carapace; in the shape and the position of the 

 spines on the telson etc. Meinert does not mention the an- 

 tennee, and therefore it seems probable, that Axius nodulosus 

 should not be included in the genus Euconaxius. 



