166 THE VOYAGE OF H.M.S. CHALLENGER. 



rugose than in the preceding species, and a few granulations are met with on the anterior 

 gastric region. The denticles on the lateral margin of the carapace are obsolete, and a 

 rounded finely serrated lobe occurs on the orbital margin behind the antennal peduncle. 



The chelipedes are wanting in both specimens.^ The ambulatory limbs are very 

 similar to those of the last species, but the dactyli have a less obvious biunguiculate 

 appearance. 



The eyes are of small size, and partly hidden by the sides of the rostrum. The 

 merus of the external maxillipedes is finely granulated externally, and the inner margin 

 is bispinose ; a minute spine is also present at the distal end of the outer margin. 



The transverse carinse on the second, third, and fourth abdominal segments are some- 

 what strongly marked (they are not represented in the figure). 



Length of body (of a male) 18 mm., of carapace 10*5 mm., of chelipede 11 mm., of 

 ambulatory leg (detached) 8 mm. 



Habitat. — Station 173, off Matuku Island, Fiji ; depth, 315 fathoms ; bottom, coral 

 mud. A male specimen. 



Station 210, among the Philippine Islands; depth, 375 fathoms ; bottom, blue mud. 

 A male specimen. 



Genus Galacantha, A. Milne-Edwards. 



Galaeantha, A. Milne-Edwards, BuU. Mus. Comp. ZooL, vol. viiL No. 1, p. 52, 1880. 



Rostrum long and spinulous, the proximal part horizontal, the apical portion upturned. 

 Carapace broad, and convex from side to side, armed with a median spine of large size, 

 placed near the posterior limit of the gastric area, and with an anterior gastric pair of 

 spines and a cardiac spine of smaller size. Lateral margin of the carapace provided with 

 two prominent flattened spines in front. Chelipedes rather stout, and exceeded in length 

 by the ambulatory limbs. Eyes devoid of pigment, with the cornese terminal in position. 

 Antennal peduncle stout, the flagellum of moderate length. Second, third, and fourth 

 abdominal segments strongly bicarinate transversely, and armed each with a prominent 

 median spine. Male reproductive appendages of large size. Eggs few in number and 

 of large size. 



The characters of this genus as constituted above are so distinct that I cannot agree 

 with Professor S. I. Smith's remark that it should perhaps be united with Munidojjsis ; 

 judging from the description" it appears extremely doubtful whether the species which he 



' These were apparently lost after my departure from Scotland and while the specimens were in the hands of the 

 draughtsman, for I find from the diagnosis of the species that they measured 11 mm. in length in an individual 

 measuring 18 mm. The chelipedes, as represented in the figure, must be regarded with suspicion, as their length (in 

 proportion to that of the body) greatly exceeds the above measurement. 



- " Allirttross" Crustacea, Report United States Fishery Commission, 1882. p. 350. 



