^66 . Mrs. e. w. sexton ok tab 



little shorter than the 4th. The Jlagellum is about half as long 

 again as the 5th joint : it is composed of 8 joints in Zaddach's 

 specimens, of 10 in the larger ones, the terminal joint in all 

 microscopic. 



Oral Parts. — Uj^per Lip{6g.A): apex asymmetrically bilobed. 



Loiver Lij? (fig. 5) large ; outer lobes rounded, inner lobes 

 appear to be coalesced at the base. 



Mandibles (fig. 6). — Both ciitting -plates and accessory-plates 

 divided into 4-5 strong rounded teeth, the lowest being the 

 largest ; 7 dentate spines in the spine-roio in Zaddach's specimen, 

 9-10 in the large animals, the first two or three laminar. The 

 molar is large and cylindrical, crown ridged with rows of teeth, 

 and edged with flat spines, furnished with a long feathered seta 

 above ; in the figur-e the molar is not well represented, being 

 bent back to show the other portion of the mandible more clearly. 

 The palp is very large ; 3rd joint the longest, tipped with 4 

 strong curved bristles, the distal inner margin furnished with a 

 double row of finely serrate bristles. 



Maxilla 1 (fig. 7) as described by Zaddach : inner plate large, 

 with 1 long plumose seta ; outer plate with 1 1 strong spines on 

 its apex, 3 dentate ones at the upper angle, and the others 

 arranged in pairs, 1 bifurcate and 1 dentate together; in the 

 figure only one of the rows can be shown. The 2nd joint of the 

 palp widens towards the truncate apex, which is furnished with 4 

 strong short spines inset apically, and a diagonal submarginal 

 row of 4 setae. 



Maxilla 2 (fig. 8) as large as maxilla 1 ; inner plate the smaller ; 

 the apices of both plates carry long curved stiff bristles ; the 

 inner margin of the inner plate has 2 rows of plumose setae, 

 setting out at different angles, one row containing 3 times as 

 many setae as the other. 



Maxillipeds (fig. 9). — Inner and outer j^lcUes well developed ; 

 inner plates narrowed distally, the truncate apices inset with 3 flat 

 spines, outer margins with 3 setiform spines distally ; a row of 7 

 long jointed plumose setae crosses each of the plates diagonally 

 from the outer angle of the apex to the inner margin, extending 

 more than halfway down the latter. The outer plates are 

 widened distally ; in Zaddach's specimen the plate on the right 

 side is furnished with 1 long plumose seta apically and 8 graduated 

 strong spines along the inner distal margin ; the plate on the left 

 has 2 of the plumose setae apically, and 7 of the graduated spines ; 

 the outer surface carries numerous stiff curved bristles along the 

 inner margin. Palp, 2nd joint much the largest; 3rd much 

 produced on the inner surface over the insertion of the finger ; 

 finger small, obtuse, tipped with strong serrate setiform spines. 

 The 2 basal joints and the lst-3rd joints of the palp are provided 

 on the outer surface with numerous long delicate plumose setfe. 



The First Ghiathopod (figs. 10-15) is longer than the second 

 in the male, shorter than the second in the female. It is 

 characterised by the remarkable development of the 5th-7th joints 



