918 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Maui Island, 178 to 267 fathoms, stations 4080, 4081, 4082, 4083, and 4084; northeast approach to Pai- 
lolo Channel, 272 to 290 fathoms, stations 4095, 4096, and 4097; northwest coast of Oahu Island, 195. to 
282 fathoms, stations 4115, 4117, 4120, and 4121; southwest coast of Oahu Island, 352 to 357 fathoms, 
station 4123. 
Color.— Carapace translucent, showing anatomy, dark dirty crimson lake in front, very pale 
behind. Abdomen pale rose madder pink. Swimmerets and thoracic legs bright Chinese vermilion 
tending to carmine. Eyes black, iridescence yellow. 
Heterocarpus lsevigatus Bate. 
Heterocarpus leevigat.us Bate, Challenger Macrura, 636, pi. cxii, fig. 3, 1888; Anderson, Ann. Mag. 
Nat. Hist. (7), III, 1899, 285. Illus. Zool. Investigator, Crust., pi. xlii, figs. 1, la, 1899. 
Alcock, Desc. Cat. Indian Deep-Sea Crust. Dec. Macr. Anom., 105, 1901. 
The Hawaiian specimens show the following variations from the description of Alcock (loc. cit.) : 
In four of the largest specimens, regardless of sex, the rostrum is shorter than the carapace. In 
many cases there are seven dorsal teeth, including the one or two on the rostrum ; in one specimen 
there are eight teeth. 
Dimensions of largest specimen, an egg-bearing female: Length of rostrum, 40 mm.; of carapace, 
48.5 mm.; of abdomen, 91 mm. 
Distribution. — Kaiwi Channel, 314 to 460 fathoms, stations 3470, 3474, 3475, 4105, 4106, 4109, 4110, 
4112, and 4113; Pailolo Channel, 256 to 311 fathoms, stations 3865 and 3901; south coast of Oahu Island, 
308 to 337 fathoms, stations 3909 and 3910; French Frigate Shoal, 395 to 397 fathoms, station 3973; 
vicinity of Kauai Island, 165 to 632 fathoms, stations' 3988, 3992, 4013, 4021, 4028, 4137, and 4141; 
southwest coast of Oahu Island, 357 to 350 fathoms, station 4124; vicinity of Niihau Island, 319 to 426 
fathoms, stations 4178 and 4179. 
Heterocarpus signatus, sp. nov. 
(PI. xxi, fig. 6.) 
This species is represented by only two small and soft-shell specimens, which resemble the young 
of H. vicarius Faxon. 
Rostrum a little longer than carapace. Dorsal crest reaching nearly to posterior margin, armed 
with six large spines followed anteriorly by six or seven small ones; four or five spines on the cara- 
pace proper, the posterior one at its middle. Lower margin with ten small spines. Upper lateral 
carina of carapace much straighter than in H. vicarius; a very short carina leading from the antennal 
spine; the branchiostegal spine much longer and more advanced than the antennal, and its carina 
extending two-thirds the length of the carapace. Abdomen similar to that of H. vicarius, only the 
third segment being crested and that bluntly; at the posterior third of the crest in both specimens a 
small, oval depression resembling a scar. The inner branch of the uropods is distinctly longer than 
the telson; in H. vicarius just as long. Acicle nearly two- thirds length of carapace, longer than in 
H. vicarius, the antennular peduncle extending no farther than the middle of it. Maxilliped provided 
with an exopod and reaching nearly *to end of acicle. The first pair of feet reach to same point 
and have a microscopic dactylus. The second foot on the right extends nearly to end of antennal 
peduncle, its carpus with eight joints. The second foot on the left extends beyond the peduncle by 
the length of the chela and three segments of the carpus, which has twenty-one joints. The third 
foot exceeds the acicle by length of its dactylus and two-fifths of the propodus; the fifth foot just 
attains end of acicle. These legs are considerably longer in H. vicarius. 
Dimensions. — Largest specimen, length of carapace 12.8 mm., of rostrum 13.5 mm., of abdomen 
25 mm. 
Type locality. — West coast of Hawaii Island, 382 to 253 fathoms, station 4041 (Cat. No. 30551). 
Heterocarpus alexandri A. Milne Edwards. 
Heterocarpus alexandri A. Milne Edwards, Rec. PI. Exped. Travailleur, pi. xxvm, 1883. 
Vicinity of Kauai Island, 811 to 671 fathoms, station 4181; one specimen. 
