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



rostrum ; the posterior margin of the carapace is distinctly elevated, and bounded in 

 front by a narrow transverse strip which is perfectly smooth. 



The chelipedes are armed with blunt tubercular granulations, and a few short spines 

 are placed at the distal ends of the meral and carpal joints respectively, as well as on the 

 under surface of the ischia and meri. The fingers are broad, flattened, and considerably 

 longer than the palm, with their apices depressed, and the lower surfaces deeply excavated; 

 their opposed margins are furnished with short interlocking teeth, which increase in size 

 towards the apices. The ambulatory limbs are coarsely granulated, the granules showing 

 a tendency towards linear arrangement, and two short spines are placed, one on either 

 side, at the distal ends of the meri. The dactyli are moderately long and fldrly well 

 curved, with a series of five dentations on the posterior margin. 



The eyes are freely movable, and the cornese are rounded, though slightly deficient 

 internally. The joints of the antenna! peduncle are devoid of spines. The merus of the 

 external maxillipedes is granulated externally, and two spines are present on the inner 

 proximal margin, the first of which is considerably swollen towards its base ; in some 

 cases a third spine is present, placed slightly above the middle of the margin. 



The second, third, and fourth abdominal segments are strongly granulated towards 

 their lateral margins, whereas the fifth and sixth are almost devoid of granulations. 

 The first and second abdominal spinules are well developed and rather strongly curved. 



This species is very closely allied to Galacantha rostrata, A. Milne-Edwards, but a 

 careful comparison with the types of the latter has convinced me that it is distinct. In 

 the Challenger species, the tubercles on the carapace are of larger size, and more strongl)- 

 marked on the anterior half ; the gastric spine is shorter and broader at its base ; the 

 rostrum also is shorter and slightly more oblique ; the lateral spines are of smaller size, 

 more nearly equal, and separated by a wider interval ; the carina at the base of the 

 rostrum is more strongly developed ; and the chelipedes are decidedly more spiny. 



Breadth of carapace (of an adult male) 22 mm., length of body (including rostrum) 

 65 mm., of carapace (including rostrum) 35 mm., of gastric spine 6"5 mm., of apical 

 portion of rostrum 5 mm., of second lateral spine 5 mm., of chelipede 48*5 mm., of first 

 ambulatory leg 51 mm. The largest female specimen measures 67 mm. in length, and 

 its chelipedes only 42 mm., while the ova are about 2'8 mm. in diameter. 



Habitat. — Station 300, west of Valparaiso ; depth, 1375 fathoms ; bottom, Globigerina 

 ooze. Four males and two females, both of the latter with ova. 



Genus Eumunida, S. I. Smith. 



Eumumda, S. I. Smith, Proc. U.S. Nat. Mus., vol. vi. No. 1, p. 44, 1883. 

 Rostrum slender and styliform, with a pair of well-developed supraorbital spines 

 on either side of its base. Chelipedes and ambulatory limbs elongated and slender. 



