CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 89 



abundant than adults, and were taken with the dredge in 4 fathoms, 

 weedy sand. 



In the time of Steller a species of Cheirogoniis was so abundant 

 in Avatcha Bay (Kamchatka) that it formed a common article of 

 food among the inhabitants. At the present time, however, it has 

 entirely or nearly disappeared, as we did not succeed in obtaining a 

 specimen ; nor do the naturalists of Beechey's voyage mention having 

 found it. 



Genus NAUTILOCORYSTES Milne Edwards 



The name Dicera, proposed for this genus by De Haan and re- 

 tained by Krauss and Dana, was published before that of Milne 

 Edwards. The name given by the latter naturalist is, however, 

 retained, as Dicera was several times preoccupied as a generic term 

 in zoology, and once among the Articulates. 



136. NAUTILOCORYSTES OCELLATUS ' Milne Edwards 



Dicera octodcntata De Haan, Fauna Japonica, Crust., p. 15 (no descr.). 



Krauss, Sudafr. Crust, p. 27. 

 Nautilocorystcs occllatiis Milne Edwards, Hist. Nat. des Crust., 11, 149. 



Dredged on a sandy bottom, in 12 fathoms, in Simons Bay, Cape 

 of Good Hope. 



OCYPODOTDEA 



CARCINOPLACID.^ 



Genus PILUMNOPLAX Stimpson 



This genus was instituted for a group of small Carcinoplacidse 

 having much the aspect of Piluuinus in their shape and frequent 

 setose covering, but easily distinguished by the depressed form and 

 great posterior breadth of the carapax as well as by the character of 

 the male organs. The antero-lateral margin is very short ; the eyes 

 and orbits very small and rounded. The facial and oral members 

 are nearly as in PiUimnns. The basal joint of the antennae is mov- 

 able, and does not reach the frontal margin. The meros-joint of the 

 external maxillipeds is nearly square. The palate is on each side 

 divided by a ridge more or less distinct. The chelipeds are generally 

 short. The ambulatory feet are long and slender, those of the pe- 

 nultimate pair usually the longest; the dactyli flattened, and in the 



^ Nautilocorvstcs octodentatus (De Haan). 



