906 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Aristeus semidentatus Bate. 
(PI. xix, fig. 1.) 
Aristeus semidentatus Bate, Ann. Mag. Nat. Hist. (5), VIII, 1881, 189; Illus. Zool. Investigator, 
Crust., pi. xlix, fig. 3, male, 1901. 
Hemipenxus semidentatus Bate, Challenger Macrura, 305, pi. xlix, fig. 1, female, 1888. 
Aristxus semidentatus Wood-Mason, Ann. Mag. Nat. Hist. (6), VIII, 1891, 280; Alcock, Desc. 
Cat. Indian Deep-Sea Crust. Dec. Macr. Anom.f 31, 1901. 
Distribution. — Kaiwi' Channel, 295 to 442 fathoms, stations 3470, 3472, 3474, 3475, 4105, 4106, and 
4108; south coast of Oahu Island, 228 to 337 fathoms, stations 3815, 3910, 3911, 3916, and 3917; vicinity 
of Kauai Island, 165 to 500 fathoms, stations 3988, 3989, 4015, 4016, 4020, 4021, 4022, and 4025; west 
coast of Hawaii Island, 382 to 253 fathoms, station 4041 ; north coast of Maui Island, 267 to 283 fathoms, 
station 4085; northeast approach to Pailolo Channel, 308 to 306 fathoms, station 4088; north coast of 
Molokai, 328 to 809 fathoms, stations 3887 and 3892. 
The rostrum of the female in Hawaiian specimens is usually shorter than the carapace, varying 
from about eight-ninths to just the length of the carapace. The acicle, on the other hand, runs some- 
what longer than in the Indian form, its length being contained about one and a half times in the 
length of the carapace of the female, one and a fourth times or less in the male. 
Color (from notes by the collector). — Rostrum, basal parts of antennae, legs and sides of thorax, 
vermilion to orange vermilion. Legs punctate with burnt carmine. Dorsum of carapace, Payne’s 
gray to purple, the viscera showing through. Eyes black, showing iridescent yellow. Abdomen light 
opaque pink except joints (articulations), which are yellowish salmon pink. Telson carmine or 
yellowish carmine. 
Benthesicy mus investigatoris Anderson. 
Benthesicymus investigatoris Anderson, in Alcock and Anderson, Ann. Mag. Nat. Hist. (7), III, 
1899, 282; Illus. Zool. Investigator, Crust., pi. xli, fig. 2, 1899; Alcock, Desc. Cat. Indian 
Deep-Sea Crust. Dec. Macr. Anom., 44, 1901. 
Distribution. — South coast of Molokai Island, 222 to 498 fathoms, station 3824; north coast of 
Molokai Island, 552 to 809 fathoms, station 3887; vicinity of Modu Manu, 222 to 1,059 fathoms, stations 
3977, 3979, 4153, and 4166; vicinity of Kauai Island, 339 to 703 fathoms, stations 3985, 3989, 3997, 4013, 
4014, 4019, 4022, 4028, 4029, 4137, 4139, 4140, 4141, and 4187; Kaiwi Channel, 395 to 470 fathoms, 
stations 4109, 4110, 4111, 4112, 4113. 
There are two teeth on the dorsal margin of the rostrum, besides the acuminate tip; behind the 
posterior tooth, there is a very small rudiment of a movable spine. 
The carina of the fifth as well as of the sixth abdominal segment ends pos- 
teriorly in a small spine. Sixth segment twice as long as fifth. 
Color. — Carmine. 
Length of largest specimen, female (station 4110), 86 mm., carapace 32.2 mm. 
Benthesicymus laciniatus, sp. nov. 
(PI. xix, fig. 3.) 
Allied to B. crenatus Bate (Challenger Macrura, 329, pis. liv and lv, 1888). 
Two, instead of three, teeth on the dorsal surface of the rostrum. Median 
carina of carapace not evident behind gastric region. No hepatic spine. 
Fourth segment of abdomen spinulous or laciniate on posterior margin; the 
spinules irregular, but increasing in size toward the middle; a short, transverse 
groove across middle of segment; behind it a median groove terminating in 
a prominent but short spine. 
Telson armed with three spines on each side on the posterior half, besides the pair at the 
extremity. 
First joint of antennula longer than eye-stalk; upper flagellum at least as long as carapace, includ- 
ing rostrum and first segment of abdomen; lower flagellum still longer. These flagella are incomplete 
in all the specimens. 
Acicle less pointed than in B. crenatus; flagellum one and a half times as long as body. 
Fig. 59 . — Benthesicymus 
laciniatus, type, pos- 
terior half of telson, 
X 2 §. 
