Mr. KE. J. Miers on the Plagusiinz. 153 
a group of tubercles on the hepatic region of the carapace, 
near the base of the outer orbital tooth; and the spines upon 
the upper margins of the merus joints of the ambulatory legs 
are much stronger. 
Hab. Japan (De Haan), Simoda (Stimpson). 
I have seen no specimens. 
LEIOLOPHUS. 
Acanthopus, De Haan, Faun. Japon. Crust. p. 29 (1835); M.-Edw. 
Ann. Sci. Nat. (sér, 3) Zool. xx. p. 180 (1853); nom. preoccu- 
patum. 
Leiolophus, Miers, Cat. New-Zeal. Crust. p. 46 (1876). 
Outer maxillipeds with the merus joint very small and much 
narrower than the preceding jot. (Carapace with smooth 
naked ridges on its upper surface, but without numerous tuber- 
cles. Merus joints of the ambulatory legs with a series of 
spines on their upper margins. Male genital appendages of 
the first pair not twisted, with a terminal claw.) 
Leiolophus planissimus. 
Cancer planissimus, Herbst, Naturg. Krabben und Krebse, iii. pl. lix. 
fig. 3 (1804). 
Plagusia serripes, Lam. Hist. An. sans Vert. p. 247 (1818). 
Plagusia clavimana, Desm. Consid. Crust. p. 127, pl. xiv. fig. 2 (1825) ; 
M.-Edw. Hist. Nat. Crust. ii, p. 92 (1837); Atlas in Cuvier, R. A. 
pl. xxiii. fig. 3. 
Acanthopus planissimus, De Haan, Faun. Japon. Crust. p, 30 (1835) ; 
Dana, U.S. Expl. Exp. xiii. Crust. p. 372 (1852); M.-Edw. Ann. 
Sci. Nat. (sér. 3) Zool. xx. p. 180 (1853). 
Acanthopus Gibbesi, M.-Edw. Ann. Sci. Nat. ¢. c. p. 180 (1853). 
Levolophus planissimus, Miers, Cat. New-Zeal, Crust. p. 46 (1876). 
Hands in the male strong; the palms compressed and con- 
siderably dilated, much broader than the wrist, not sulcated 
on their upper margins. Greatest width of the abdomen of 
the male exceeding its length to the base of the last segment. 
Specimens are in the British Museum from Mauritius (Lady 
F. Cole), Torres Straits (Jukes), Keeling or Cocos Island (Lieut. 
Burnaby), Pacific Ocean (Smithsonian Inst.), Madeira (Rev. 
L. T. Lowe), Jamaica (purchased). 
It is abundant in the Polynesian archipelago, having been 
recorded from islands in the Paumotu, Society, Samoan, and 
Hawaiian groups (Dana), also from Cape St. Lucas and the 
coast of Florida, Key Biscayne (Stimpson). 
In male specimens of large size from Madeira, the genital 
appendages of the first pair differ slightly from those of Z. 
abbreviatus and Brocchi’s figure (/. ¢. fig. 171), in being 
slender, more curved, and narrower in the middle than at 
either extremity. 
Ann. & Mag. N. Hist. Ser. 5. Vol. i. 11 
