Zoology. 291 
2. Note on the genera Hexapus and Arges of De Haan ; by J. D. Dawa. 
. —The genus Hezapus of De Haan, in his first publication of its charac- 
ters, (in Decade I. and II. of the Fauna Japonica, pp. 9 and 35,) is 
arranged near Pinnothera, which it resembles in its short obese form 
and smallsize. But in his last Decade, published in 1849, which con- 
tains his final remarks on classification, at p. xiv, the genus is referred 
to the vieinity of Pilumnus.—The outer maxillipeds are as in Pilumnus. 
The genus i is peculiar in the 5th pair of legs Vs obsolete. "The spe- 
cies is t - H. sexpes, (Jap., p. 63 and pl. 11, f. 6, Cancer sexpes of 
Fabricius, Ent. Syst., Suppl., p. 344, f. 37.) 
| The genus Arges of De Haan, (Faun. Japon., p. 21,) includes only 
- jes. It is Caneroid in its outer maxillipeds and near RE 
| also Menippe. "The abdomen in both sexes is 7-jointed ; 
e oblong-trigonal, in the female ovate. The lateral nup. 
lhe carapax are parallel and entire, and the general form is much 
like that of Cyclograpsus Audouinii and the allied. Distance between 
e eyes one-fifth the breadth of the thorax.—Sp. 4. parallelus (F. Jap., 
. 92, and pl. 5, f. 4) from Japan. 
