76 THE VOYAGE OP H.M.S. CHALLENGEE. 



It is to be noted, however, that the sexual appendage is rather longer and more slender 

 than in the case of American specimens,' and there is indication of a slight protrusion on 

 the left side. The gills are of the normal phyllobranchiate type. 



The previously known species are two in number, viz., Catcqjagurus sharreri, 

 A. Milne-Edwards ( = Heniipagiirus socialis, S. I. Smith), from off Barbados and the 

 east coast of the United States, and Catapagurus gracilis, S. I. Smith, also from the 

 latter locality ; both are from moderately deep water. 



Catapagurus austraJis, n. sp. (PL VIII. fig. 1). 



Cliaracters. — The anterior portion of the carapace is smooth. The eye-stalks are 

 long, slightly exceeding the antennal peduncle, and reaching the middle of the last joint 

 of the antennular peduncle ; the corner are slightly dilated ; the ophthalmic scales have 

 their apices rounded, but a prominent acute spine is present on the inner and distal 

 margin of each. The antennal acicle reaches the middle of the last joint of the antennal 

 peduncle ; the external prolongation of the second joint is but slightly marked. 



The right chelipede has the merus armed with two or three spines on the outer and 

 distal border ; the carpus is not equal in length to the propodus, its upper surface is 

 densely pubescent and carries three rows (two marginal and one central) of curved acute 

 spinules ; the upper surfjice of the propodus is covered with a matted pubescence, and 

 the margins are fringed with long hairs, a median ridge capped by about five spinules 

 is present, though most prominent towards the proximal end, where it finally passes 

 on to the upper surface of the immobile finger, and several spinules smaller than 

 those of the carpus are found on the inner margin ; the fingers are less than half 

 the total length of the propodus, and a ridge is present on the upper surface of the 

 dactylus. The left chelipede is more slender and slightly shorter than the right, but 

 the armature is the same, the fingers are, however, more than half the total length of the 

 propodus, and they terminate in well-marked horny claws. The ambulatory limbs are 

 smooth, with the anterior borders of the carpal and propodal joints very slightly 

 spinulous ; the dactyli are considerably longer than the propodi, and moderately curved, 

 a series of long horny setse is present on the anterior border, and a few shorter setae 

 on the posterior border. 



The abdomen is wanting in the better preserved specimen, but the carapace measures 

 4*8 mm. in length, and the ocular peduncle 2"5 mm. 



Habitat. — Station 188, Arafura Sea; depth, 28 fathoms; bottom, green mud. A 

 male specimen, from which the above description is taken. 



Reefs at Levuku, Fiji Islands. A very imperfect specimen ; in this the antennal 

 acicle is slightly longer than in the above, almost reaching the end of the eye-stalk. 



1 Vide " Albatross " Crust., Rep. U.S. Fish. Comm., 1882, pis. iii., iv. 



