378 Mr. L. A. Borradaile — A Revision 



Suhoidev MACRURA. 



Tribe CAllIDEA. 



Subtribe M N C A R P I x E A, 



Family Pontoniidae^ Bate, 1888. 



Pontomidce, Bate, ' Clialleng-er ' Macrura, p. 927 (1888); Ortmann, 

 Zoo]. Jahrb. v., Syst. p. 460 (1891). 



Monocarpiviea with the body often depressed ; rostrum not 

 movable on carapace, often short, compressed or depressed, 

 with or without dentations ; outer flagellum of lirst antenna 

 consisting of a thick hairy part, bearing a thin hairless part, 

 the latter usually arising from the former at a short distance 

 trom the free end, and thus giving it a bifid appearance; 

 mandible deeply cleft into two divisions and always without 

 a palp ; endopodite of second maxilliped not biramous ; third 

 inaxilliped pediform, but usually with some of the joints 

 broadened ; all the legs without exopodites or mastigobranchs ; 

 first two pairs of legs chelate, first pair slender, second pair 

 larger than the first, not foliaceous. Mode of life often serai- 

 parasitic. 



Genera : — Perich'menes, Costa, 1844 ; CoralUocaris^ Stirap- 

 son, 1860; Harpilms, Dana, 1852; Anchistus, gen. nov, ; 

 Ponfonia, Latreille, 1829 ; Concliodytes, Peters, 1851 ; Tyjpion^ 

 Costa, 1844. 



The new genus Anchistus included in the above list is 

 proposed for the reception of Ilarpilius inermisy Miers, 

 //. spinuliferus, Miers, H. Aliersi, de Man, and a new species 

 from New Guinea. These species differ from Harpilius in 

 the structure of the rostrum and second pair of maxillipeds 

 and also somewliat in that of the third maxillipeds. The 

 lostrum is deep, but owes its depth to the inferior keel, which 

 is well developed along its whole length, the superior dentate 

 crest being absent. 1'he free end of the structure is rounded 

 (in A. spinuliferus it diminishes abruptly to a point) and is 

 bent downwards. Jn A. Miersi there are a few dentations on 

 the rounded free end. The second maxillipeds have the 

 penultimate joint broader than the last joint and bearing it 

 Terminally. The third maxillipeds have the antepenultimate 

 joint of moderate breadth and somewhat different in shape 

 from that of Harpilius. 



On consideration of the mutual relationships of the genera 

 enumerated above, tliey appear to fall into four groups : — 



