REPORT OH THE BRACHYURA. 
205 
natatory legs with the penultimate and terminal joints moderately dilated, the terminal 
joints either ovate or ovate lanceolate. 
This genus is evidently very nearly allied to Carupa, Dana, and transitional forms 
may hereafter occur, which may render it desirable to unite Carupa with Lissocarcinus. 
Carupa has, however, a less prominent front, and a narrower basal antennal joint. 
Of the species already ''described, one, Lissocarcinus boholensis, Natick, is found at 
Bohol, one, Lissocarcinus polybioicles, occurs in the Indo-Malaysian and Australian Seas, 
the other, Lissocarcinus orbicularis, Dana, throughout the Indo-Pacific region. 
In the collection of H.M.S. Challenger is an apparently undescribed form from the 
Celebes Sea (10 to 20 fathoms) which I will designate Lissocarcinus Isevis. 
Lissocarcinus polybioicles, Adams and White. 
Lissocarcinus polybioicles, Adams and White, Crust., in Zool. H.M.S. “ Samarang,” p. 46, pi. xi. 
fig. 5, 1848. 
„ „ A. Milne Edwards, Archiv. Mus. Hist. Hat., vol. x. p. 417, 1861. 
South Australian Coast, 2 to 10 fathoms, April 1874. An adult ova-bearing female. 
Adult 5 . Lines. Millims. 
Length of carapace and front, nearly . . . . 6 12 
Breadth of carapace, . . . . . . . 6 12 
Lissocarcinus Isevis, n. sp. (PI. XVII. fig. 3). 
The carapace is broader than long, in its median portion moderately convex, and to 
the naked eye it appears smooth and shining, but under the microscope punctulated and 
minutely granulated. The front is four-lobed ; the median lobes scarcely more prominent 
than the lateral ones, broad and truncated, separated by a small median notch, the lateral 
lobes (or inner orbital angles) small and dentiform. Orbits entire. Antero-lateral 
margins shorter than the postero-lateral margins and armed with five teeth, whereof the 
first is very small and little prominent, the second, third, and fourth subequal and not 
acute, the fifth small and dentiform ; the postero-lateral margins are strongly concave ; 
the eye-peduncles are very short. The antennulary fossettes are transverse. The basal 
joint of the antennae is much enlarged, longer than broad ; its inner and distal angle fills 
the inner orbital hiatus, and is produced into a strong tooth or lobe, which projects con- 
siderably beyond the inner subocular lobe ; the two following joints are small and 
subequal ; the ischium of the outer maxillipecles is longitudinally canaliculated on its outer 
surface, the merus is narrower at its distal extremity (which is truncated) than at the base. 
The chelipedes (in the female) are subequal ; merus without teeth or spines, but with a 
small tubercle on its anterior margin near the distal extremity ; carpus smooth, but 
