REPORT ON THE BRACHYURA. 
251 
I think that this genus would perhaps be better regarded as a subgenus of Macroph- 
thalmus, and might perhaps include those forms ( Macrophthalmus quadratus, A. Milne 
Edwards, Macrophthalmus -punctulatus, Miers, &c.) which differ from the typical 
Macrophthalmi in their narrower carapace and broader front, and from Euplax in that 
the eye-peduncles reach, or nearly reach, the antero-lateral angles of the carapace. 
Hemiplax hirtipes , Heller. 
Metaplax hirtipes, Heller, Verbandl. d. k. k. zool.-bot. Gesellscli. Wien, vol. xii. p. 521, 1862, 
Hemiplax hirtipes, Heller, Crust, in Reise der “Novara,” p. 40, pi. iv. fig. 3, 1865. 
„ „ Miers, Cat. New Zeal. Crust., p. 34, 1876. 
New Zealand, Queen Charlotte Sound, 10 fathoms (Station 167a). Five small 
specimens, males and females. 
The chelipedes and ambulatory legs are more slender than in the fully grown adult, 
the carapace perhaps narrower, and the ambulatory legs less hairy. The largest male 
measures as follows : — 
Adult S • Lines. Millims. 
Length of carapace, about . . . . . . 3 6’5 
Breadth of carapace, about . . . . . . 4 8 - 5 
Euplax, Milne Edwards. 
Euplax, Milne Edwards, Ann. d. Sci. Nat., ser. 3, Zool. xviii. p. 160, 1852. 
„ A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. ix. p. 281, 1873. 
Chxnostoma, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 97, 1858, subgenus (1). 
This genus was established by Milne Edwards for two species which very nearly 
approach Macrophthalmus in all structural characteristics, and are distinguished merely 
by the shorter eye-peduncles, which do not nearly reach the exterior orbital angle (which 
is less developed than in the typical Macrophthalmi) ; the carapace is narrower than in 
the typical forms of Macrophthalmus and is uniformly granulated, and the front broader 
in width, nearly equalling the length of the eye-peduncles. It is very nearly connected 
with Macrophthalmus, through such forms as Macrophthalmus quadratus, A. Milne 
Edwards, and Macrophthalmus punctulatus, Miers. 
Of the two species assigned by Milne Edwards to this genus, one, Euplax hoscii, is 
distributed throughout the Indo-Pacific region, the other, Euplax leptophthalmus, Milne 
Edwards, occurs on the coast of Chili. 
