880 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Rostrum divided nearly to its base; horns about one-fourth or one-fifth the length of the remainder 
of the carapace, slender, straight, moderately deflexed and divergent. 
Supraooular eave moderately swollen, its anterior end not prominent. 
Chelipeds of male a little stouter than legs and nearly as long as carapace; those of female no j 
stouter than legs, and a little shorter than carapace minus rostrum; surface smooth; fingers narrowly j 
gaping in both sexes. 
Ambulatory legs slender, unarmed except for a spinule at the end of the merus. 
The entire surface of the crab except the fingers is covered with a short dense coat of vesicular 
pubescence, which is thinner and more easily rubbed off from the top of the buttons. There are also i 
long slender hairs except- on the elevations. 
Dimensions. — Female, type, median length 12.3, including horns 14.7, width 10.4 mm.; male, j 
station 4081, median length 11.1, including horns 14, width 9 mm. 
Distribution. — South coast of Molokai Island, 169 to 182 fathoms, station 3835 (type locality); west j 
coast of Hawaii Island, 198 to 147 fathoms, station 4045; north coast of Maui Island, 143 to 220 fathoms, 
stations 4079, 4080, and 4081; northwest coast of Oahu Island, 195 to 241 fathoms, station 4115. Cat. | 
No. of type, 29798. - 
This species in its horns and orbits approaches S. stimpsoni (Miers), from which the difference in J 
the excrescences will readily separate it, and should the genus Oxyple.urodon Miers be maintained ; 
apart from Sphenocarcinus, our species should belong to the former. The orbits are truly Pisine, there 
being a deepish sinus above, between the supraocular eave and the postorbital cup; the inferior sinus J 
is as deep as, but much narrower than, in S. stimpsoni (see Miers, Challenger Brachyura, pi. vi, I 
fig. 16). j 
Huenia proteus (de Haan). 
Huenia proteus Alcock, Jour. Asiat. Soc. Bengal, LXIV, 1895, 195, and synonymy. Borradaile, i 
Fauna and Geogr. Maidive and Laccadive Arch., II, 686, text fig. 124, pi. xlvii, figs. 1 and 2, 1903. j 
Distribution. — South coast of Molokai Island, 73 to 43 fathoms, station 3849; Auau Channel, 43 to i 
32 fathoms, station 3872; vicinity of Laysan Island, 10 to 30 fathoms, stations 3955 and 3959; French 
Frigate Shoal, 14J to 17£ fathoms, stations 3968, 3969, and 3970; vicinity of Modu Manu, 20 to 183 j 
fathoms, stations 4146, 4158, 4161, and 4164. Hawaiian Islands, A. Garrett, 1 female, in Museum of i 
Comparative Zoology. 
Simocarcinus simplex (Dana). 
Simocarcinus simplex Alcock, Jour. Asiat. Soc. Bengal, LXIV, 1895, 196,. and synonymy. 
Hilo, H. W. Henshaw; Honolulu Reef; Waikiki Beach; Laysan; Hawaiian Islands, W. H. Pease, 
in Philadelphia Academy of Natural Sciences. 
Oahu or Maui (Dana). Honolulu (Cano). 
A lobule is present at either extremity of the posterior 
border of the carapace. The tip of the rostrum sometimes 
shows signs of bifurcation. 
Echinoecus pentagonus Rathbun. 
Echinoecus pentagonus Rathbun, Proc. U. S. Nat. 
Mus. 
XVII, 1894, 66. 
Vicinity of Modu Manu, 26 fathoms, station 4147 ; 1 male. 
Male of same shape as female, anterior portion less 
deflexed; rostrum not emarginate; length 10.2, width 9.4 mm. 
Menaethius monoceros (Latreille). 
Mensethius monoceros Alcock, Jour. Asiat. Soc. Bengal, 
LXIV, 1895, 197, and synonymy. Borradaile, Fauna and Geogr. Maidive and Laccadive 
Arch., II, 1903, 686. 
Fig. 37 . — Echinoecus pentagonus , male, station 
4147, x If. 
Distribution. — Vicinity of Laysan Island, 10 to 16 fathoms, stations 3959 and 3962; French Frigate 
Shoal, 14J to 16J fathoms, station 3968; vicinity of Modu Manu, 21 to 46 fathoms, stations 3978 and 
4162; Honolulu, 1901; reef in front of Honolulu, 1901; east and west coasts of Maui, A. Garrett, in 
Museum of Comparative Zoology. 
Lahaina, Maui (Dana). 
