EEPOET ON THE BEACHYUEA. 
Ill 
three lobes, the median being prominent, with the anterior margin slightly concave, and 
the lateral ones rounded and but little developed (or not at all in young examples). The 
orbits are small, without marginal fissures, and with a rounded lobe or tooth at their ex- 
terior angle. The post-abdomen of the male is six-jointed; with the third and fourth joints 
coalescent. The eyes are set on short thick pedicels. The basal joint of the antennse is 
elongated, and enters well within the Ions; and narrow hiatus existinq' between the front and 
the orbits, but does not reach the inner and inferior angle of the orbit, and the very small 
flagellum is also contained within this hiatus. The merus of the exterior maxillipecles is 
very obliquely truncated at the distal extremity, and not (or scarcely at all) emarginated 
at the antero-internal angle. The chelipedes (in the adult male) are large and massive, 
unequal, the palms without crests or tubercles ; the fingers of the larger chelipede are 
armed with one or two large rounded tubercles on the inner margins. The ambulatory legs 
are moderately elongated, with the joints smooth. Subcylindrical or slightly compressed. 
Of the three well-defined species of this genus admitted by Professor A. Milne 
Edwards (tom. cit, infra, p. 218), two are commonly and widely distributed throughout 
the Indo-Pacific region and one is common in the West Indies. Little has been recorded 
concerning their bathymetrical range. 1 
Carpilius maculatus (Linne). 
Cancer maculatus, Linn., Mus. Lud. Ulrici, p. 433, 1764; Syst. Nat., ed. 12, p. 1042, 1766. 
Carpilius maculatus, Milne Edwards, Hist. Nat. Crust, vol. i. p. 382, 1834; Atlas des Crust, 
in Eegne Animal de Cuvier, pi. xi. fig. 2. 
„ „ A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. i. p. 214, 1865, 
where references to literature are given. 
Honolulu, on the reefs (an adult male). 
Adult £ . Lines. Millims. 
Length of carapace, . . . . . . . 31 A 67 
Breadth of carapace, . . . . . . . 42 89 '5 
Atergatis, de Haan. 
Atergatis, de Haan, (subgenus) Crust, in Siebold, Fauna Japonica, dec. i. p. 17, 1833. 
„ A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. i. p. 234, 1865, and synonyma. 
This genus somewhat resembles Carpilius in the smooth, convex carapace, whose 
regions are but faintly indicated, (if at all) but it is distinguished by the following- 
characters: — The carapace is usually more transverse and the front less prominent; the 
antero-lateral margins are defined by a continuous or nearly continuous carina, which, as 
1 Carpilius lividus, Gibbes, is probably, as stated by A. Milne Edwards, founded on a young specimen of Carpilius 
convexus (Forskal). Carpilius pr&termissus, Gibbes, is probably, as 1 have noted (Ann. and Mag. Nat. Hist., ser. 5, 
vol. ii. p. 407, 1878), identical with Liagore rubromaculata, de Haan. 
