206 
THE VOYAGE OF H.M.S. CHALLENGER. 
with a strong spine on its inner margin ; palm smooth and rounded on its outer and 
upper surfaces, without either teeth, spines, or carinse; fingers as long as the palm, acute, 
and regularly toothed on their inner margins. The three following legs are smooth and 
very slender, with straight styliform dactyli ; the posterior or swimming legs moderately 
robust; merus without spines, but obscurely dentated at the distal inferior angle; penul- 
timate joint thin and compressed, terminal joint ovate, the margins almost destitute of 
cilia. Colour (in spirit) yellowish-brown, carapace rather obscurely marked 
irregular purplish spots and blotches, as in Lissocarcinus orbicularis. 
Adult ?. 
Lines. 
Millims. 
Length of carapace, ..... 
5J 
11-5 
Breadth of carapace, ..... 
. 6i 
13-5 
Length of a chelipede, about .... 
. 7* 
16 
Length of first ambulatory leg, .... 
7 
15 
The single specimen (an adult ova-bearing female) was dredged in the Celebes Sea, 
south of Mindanao, in lat. 6° 54' 0" N., long. 122° 1 8' 0" E., in 10 fathoms (Station 212). 
The nearest ally to this species in the genus is Lissocarcinus polybioides, Adams and 
White, from which Lissocarcinus Isevis is distinguished not only by the less pro- 
minent, more distinctly truncated front, but also by the different form of the antero- 
lateral marginal teeth. 
Lissocarcinus Isevis in some particulars is intermediate between the genera Lissocar- 
cinus and Thalamonyx. The Challenger species has a broader, less prominent front than 
the other species of Lissocarcinus, and herein resembles Thalamonyx, from which it is 
distinguished by the absence of distinct spines from the palms of the chelipedes and from 
the inferior margin of the merus-joint of the fifth (natatory) legs. 
Lissocarcinus boholensis of Semper ( ined .) and Nauck, from Bohol, in the Philippines, 
is (although very briefly characterised), distinguishable from Lissocarcinus Isevis by the 
more rounded frontal teeth and the rougher chelipedes. 
Section II. Podophthalminse. 
Portuniens anormaux, A. Milne Edwards, Ann. d. Sci. Nat., ser. 4, vol. xiv. p. 283, 1860; 
Archiv. Mus. Hist. Nat., vol. x. pp. 311, 419, 1861. 
Carapace transverse and widest anteriorly, with the front very narrow, spatuliform 
and indexed. Orbits extremely large. Eye-peduncles very greatly elongated, occupying 
nearly the whole width of the carapace in front. 
This section includes only the genera Podophthalmus, Lamarck, and Eupliylax, 
Stimpson. 1 
1 According to Dr. E. Nauck (Das Kaugeriist der Brachyuren, Zeitschr. f. wiss. Zool., vol. xxxiv.), the genus 
Hedrophthalmus, Nauck, is allied to Podophthalmus, but it will not enter into the Podophthalminse as above 
characterised. 
