154 Mr. E. J. Miers on the Plagusiine. 
Unfortunately, in the British-Museum copy of Herbst’s 
work, the concluding part, containing the description and figure 
of his C. planissimus, is wanting ; I have therefore not been 
able to verify the reference, which is quoted from Milne- 
Edwards. 
Leiolophus abbreviatus. 
Acanthopus abbreviatus, Dana, Proc. Ac. Nat. Sci. Phil. p. 252 (1851) ; 
U.S. Expl. Exp. xiii. Crust. i. p. 378, pl. xxiii. fig. 11 (1852) ; 
M.-Edw. Ann. Sci. Nat. (sér. 3) Zool. xx. p. 181 (1853). 
Hands in the male small, the palm not dilated, and longi- 
tudinally suleated on the upper margin in both sexes. Abdo- 
men of the male rather narrow, its greatest width not quite 
equalling its length to the base of the last segment. 
There are specimens in the British Museum from the Mau- 
ritius, Moluccas, Gilolo (Adams), Philippines, Guimaras 
(Cuming), Fiji Islands (H.M0.8. ‘ Herald’). 
Most of the specimens in the collection are females. In one 
male adult example, whose genital appendages J have ex- 
amined, these organs are exactly of the form figured by 
Brocchi (/. c. fig. 171) in specimens referred by him to L. 
planissimus. 
Letolophus pilimanus. 
Acanthopus pilimanus, A. M.-Edw. Nouv. Archiv. Mus, Hist. Nat. 1x. 
p. 300, pl. xiv. fig. 5 (1878). 
This species, in the dilated hands of the male, resembles 
L. planissimus, but is distinguished from it and from all its 
congeners by the existence of a large patch of thick hair upon 
the inner surface of the palms. There is a row of small spines 
upon the inner margins of the antennulary cavities. The 
abdomen is also said to be narrower than in L. planissimus. 
Hab. New Caledonia (M. Balansa). 
The male only is known of this large species. I have seen 
no specimens. 
The characters assigned by M. Milne-Edwards to his 
Acanthopus afinis (Ann. Sci. Nat. sér. 3, Zool. xx. p. 180, 
1853) from the Sandwich Islands, and A. tenuifrons (U1. c.) 
from the Marquesas, do not appear to me to be of specific 
importance. 
The Letolophus spinosus (Plagusta spinosa of M‘Leay, in 
Smith’s Zool. 8. Africa, Annulosa, p. 66, 1838) would seem 
to be a distinct species, if the character ‘‘ clyped lateribus biden- 
tatis’’ be correct. It is stated by its author to be nearly 
allied tothe LZ. planissimus (P. clavimana of Desmarest), with 
which it is united by Krauss (Siidafrik. Crust. p. 42, 1843). 
