STEBBING— ISOPODA 93 



The second to the fifth peraeopods agree together in general structure, though the 

 relative lengths of the joints vary a little. The second and fifth pairs are suhequal in 

 length, the third and fourth pairs longer than these. All the joints are slender, the fifth 

 longer than the fourth, and neither overlapped by that nor under-riding the sixth; the 

 finger rather short and a little curved. The second pleopods have both branches narrow, 

 equal in length, both distally fringed with plumose setaj, and the inner having the 

 masculine appendix (its second joint) attached at some little distance from the base, but 

 far above the middle, and descending far below the distal border of the first joint, a 

 narrow straight bar as far as the apex which curves slightly inward. 



The uropods reach a little beyond the telson, the upper ramus very long, reaching 

 slightly beyond the long peduncular part which supports the inner ramus at its end, 

 a plate about half the length of the peduncle, fringed with plumose setae. 



Length 10 mm. 



Localities. Cargados Carajos, from 28 fathoms, and Saya de Malha, from 26 fathoms. 

 At the latter station the specimen obtained is also about 10 mm. long; the eyes laiger; 

 the first antenna} without the thickening and hairy furniture of the flagellum, which is 

 eighteen-jointed ; second antenna? with fiagellum twenty-two-jointed ; fifth peraeopods 

 notably shorter than the preceding pairs ; second pleopods showing no masculine 

 appendix. 



The specific name is given out of respect to the memory of the late Percy Sladen. 



Gen. APANTHURA, Stcbbing. 



1900. AjJanthura, Stebbing, Willey's Zoological Results, pt. 5, p. 621. 



This genus was defined as follows : 



" Pleon with segments distinct. Mouth-organs as in Anthura, except maxillipeds, 

 which have a three-jointed palp, of which the middle joint is much the largest. The 

 last four pairs of peraeopods, as well as the preceding pairs of peraaon appendages, have 

 the fifth joint under-riding the sixth." 



From the character of the peraeopods, it seems desirable that Anthelura abijssorum, 

 Norman and Stebbing, should be transferred, along with Anthelura ajftuis, Richardson, 

 to the present genus. With the original species Apanthura sandalensis and the new one 

 about to be described, there will then be four species, distinguishable as follows : 



First gnathopods with small finger closing within apical tooth of the sixth joint, 



1. A. xenoeheir, n. sp. 

 First gnathopods without apical tooth to sixth joint, finger conspicuous. 2. 



[ Eyes absent ; telson apically subacute. 2. A. abynsorum (Norman and Stebbing). 

 \ Eyes present ; telson apically rounded. 3. 



First gnathopods with strong hand and finger; upper branch of uropods apically 



emarginate. 3. A. sandalensis, Stebbing. 

 First gnathopods with small hand and short finger; upper branch of uropods not 



apically emarginate. 4. A. affirm (Richardson). 



