62 
. THE VOYAGE OF H.M.S. CHALLENGER. 
Colour. — The alcoholic specimens have the carapace mottled with dark brown 
pigment, with four sharply defined dark spots close to its posterior edge, six elongated 
pigment spots on the third, six on the fourth, four on the fifth, and four on each of the 
first five abdominal somites. Miers says that his specimens from the Samoan Islands were 
dull olive green, with branchial appendages pink, but those colours are not preserved in 
the specimens which I have seen. 
Habitat. — The Challenger collection includes two specimens, a male and a female, 
from 8 fathoms at Station 186, near Cape York, lat. 10° 30' S., long.. 142° 18' E. Miers 
records it from Torres Straits and. from other points in Northern Australia, as well as 
from the Red Sea, Ceylon, Gulf of Suez, Seychelles, Samoa Islands, Amboina, and other 
localities in the Indo-Pacific region. 
Size . — Largest male specimen, 2^% inches from tip of rostrum to middle of 
telson. 
Gonodactylus glabrous, n. sp. (Pl. XIV. fig. 5 ; PI. XY. figs. 7, 9). 
Diagnosis . — Dactylus of raptorial claw without teeth, and dilated at base. Ros- 
trum with a long slender acute median spine, and subacute lateral angles. Hind 
body wider than the carapace, with its sides straight and parallel. Second thoracic 
somite slightly exposed dorsally. Lateral edges of all the abdominal somites with 
triangular marginal carinse with the apices directed backwards. Dorsal surfaces of the 
thoracic and first five abdominal somites without carinse or spines. Sixth abdominal 
somite without a median carina, and with three pairs of lateral carinse, all ending in 
spines, the submedian and intermediate being swollen and convex, while the marginal 
is more narrow and linear. The second or intermediate is shorter than the first and 
third. Telson ending in six acute spines with broad bases, and each with a sharply 
defined narrow longitudinal dorsal carina. Middle of dorsal surface of telson with a pro- 
tuberant hemispherical eminence, upon which are five narrow sharply defined carinse, of 
which the median and the two submedian end posteriorly in spines, while the marginal ones 
are without spines and shorter than the others. There is a triangular subacute promin- 
ence on the anterior edge of the dorsal surface of the telson on each side, halfway between 
the middle line and the lateral margin, with a narrow sharply defined carina. Paddles 
of exopodites of uropods less than half as long as the second joint. The basal joint of 
the uropod has only one acute spine on its dorsal surface, while its ventral prolongation 
ends in two nearly equal spines, with an obsolete rounded tooth on the inner margin of 
the outer one near its base. The tergal surfaces of the abdominal somites have no trans- 
verse or longitudinal sutures. 
General Description. — This species is so very similar to Gonodactylus graphurus in 
every prominent characteristic that the description of that species will serve for this also, 
