1908] — Decapod Orustaceans. 21 
correspond pretty closely with those of UC. (Hiconaxius) coronatus, 
Tryp, these would appear to be in some respects distinctly different 
from the same members in SpenoE Bartz's species Hiconaxius acuti- 
frons. "The same too is the case with Paraxs altus and other 
species of Axius whose oral parts I have seen either described or 
depicted: unfortunately Spence Bare in his brief description of 
FHiconaxius has not dealt with the oral parts. 
If we may judge from these accounts, U. crassipes, U. corona- 
tus and Paraxius altus (and probably other species also of Axius) 
would seem to have å strong resemblance, so far as the multarti- 
eulate flagellum of the 3rd maxilliped is concerned. In E. acuti- 
froms the ecphysis on this gnathopod ås not furnished with å flagellum: 
being represented merely by a sharp stout spine (*a sharp point” 
Se. B.). Again if we compare the mandibles of UC. crassipes with 
those of Paraxius and E. acutifrons we will find that they much 
more celosely resemble those of the former than they do those of 
the latter. 
Owing then to the formation of the oral parts and to some 
other structural characteristics to be mentioned later on, SPENCE 
BarteE's genus Hiconaxius ought in my opinion to be retained: though 
Trypom's two species UC. coronatus and U. crassipes ought not to be 
classified under this genus. 
Paraxws SP. B. which seems practically to have the same 
structure in its oral parts as UC. coronatus and U. crassipes differs 
nevertheless from these according to Spence Bare in having 
neither stylocerite nor scaphocerite on the peduncle of the 2nd 
antennae: and similarly the exopodites of the rhipidura of this 
species have no suture, although å suture is found in OC. coronatus 
and UO. crassipes. 
Trypom's work was printed in 1904. In the Annals and 
Magazine of Natural History, Series 7, Vol. XII pages 534—551. 
L. Å. BOorraparLr published in 1903 åa classification of Thalas- 
sinidea,') where he divided the family Axudae into the following 
four genera Åxius, Axiopsis, Culocaris and Scytoleptus, of all of 
which he gives definitions. Both of Spence BaTtrE's genera, 
Paraxius and Hiconaxius, are regarded by BorraDaILE as sub- 
1) *On the classification of Thalassinidea”. 
