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THE VOYAGE OF H.M.S. CHALLENGER. 
distinguished except by the narrower, smoother, depressed carapace, which is not 
lobulated, has not the cervical suture developed, and has the antero-lateral margins less 
distinctly toothed. 
Eurycarcinus, A. Milne Edwards , 1 is also very nearly allied to this genus, and 
should perhaps not be separated from it ; the typical species, Eurycarcinus grandidieri, 
from Zanzibar, which I think is identical with Galenc natcdensis, Krauss, is distin- 
guished merely by the more convex carapace, with sinuated but not quadrilobate 
front and more distinct antero-lateral marginal teeth ; the basal antennal joint (in 
specimens in the museum collection), reaches the inner subocular tooth, but not the 
infero-lateral angle of the front. 
The species (with one exception, Pseudozius bouvieri, which I have placed below in a 
separate subgenus), inhabit the Oriental region. Nothing has been recorded of their 
bathymetrical distribution. 
Subgenus Pseudozius. 
Carapace moderately transverse, the frontal lobes not prominent (in the species I 
have examined), the orbital margins not notched, the ridges of the endostome reach the 
anterior margin of the buccal cavity. The merus of the exterior maxillipedes is not 
produced at its antero-external angle. 
Pseudozius caystrus (Adams and White) = Pseudozius planus, Dana. Philippine 
Islands ; Paumotu Archipelago. 
Pseudozius inornatus, Dana. Sandwich Islands. Perhaps a variety of Pseudozius 
caystrus. 
Pseudozius microphthalmus, Stimpson. Bonin Islands. The diagnosis is in 
few words, but the species is apparently scarcely distinct from Pseudozius 
caystrus. 
Pseudozius sinensis, A Milne-Edwards. China. 
Subgenus Euryozius, nov. 
Carapace very transverse, the median lobes of the front prominent, rounded, orbital 
margins notched at the antero-external angle. The ridges of the endostome or palate but 
partially developed. Merus of the exterior maxillipedes slightly produced at its antero- 
external angle. 
Pseudozius bouvieri (A. Milne Edwards) = Pseudozius mellissii, Miers, var. (?). 
Cape Verde Islands; St. Helena; Ascension Island. 
1 Ann. Soc. Entom. France, ser. 4, vol. vii. p. 276, 1867. 
