380 Mr. L. A. Borradaile — A Revision 



Conchodytes they present also a basal prominence somewhat 

 recalling that of CoralUocaris. It is worth noting that the 

 latter two genera are not without resemblances in the struc- 

 ture of their third maxillipeds and second pair of legs. 



(d) Typton shows considerable likeness to Pontonia. The 

 flagella, however, of the first antenna are both simple and 

 the scale of the second is rudimentary. The evidence of 

 these characters, which by themselves might be disregarded 

 as due to reduction consequent on a protected mode of life, is 

 strengthened by the narrowness of the third maxilliped, the 

 (short) upturned rostrum, compressed along its whole length 

 and narrowing to a point at the free end, and the two very 

 large supraorbital spines. These peculiarities, taken together, 

 mark out Typton as the most aberrant genus of the family. 



The foregoing remarks may be illustrated by a graphic 

 table as follows : — 



Pontonia. Conchodytes. Cortdliocaris. Harpilius. 



Typton 



Periclimenes. 



Genus Pehiclimenes, Costa, 1844. 



I 'dias, Roux, Mem. sur les Salicoques, p. 25 (183]) ; H. M.-Edwards, 



H. N. Crust, ii. p. 38] (1837) ; Heller, Sitz. k. Ak. Wiss. Wien, 



xlv. l,p. 4C0(1862). 

 Periclimenes, Costa, Ann. Ac. degl. Aspir. Nat. Nap. ii. (1844) ; Faun. 



Rejr. Nap. ii. 1 (1846). 

 Anchistia, Dana, U.S. Expl. Exped., Crust, i. p. 577 (1852) : Kingsley, 



Proc. Ac. N. Sci. Pbilad. 1879, p. 423 (1880) ; Cams, Trodr. Faun. 



Medit. i. p. 474 (1885). 

 Vennisia, Norman, Ann. & Mag. Nat. Hist. (3) viii. p. 278 (1861). 



Pontoniidse with rostrum long, compressed, usually dentate, 

 in side view diminishing gradually to a sharp point at the 

 free, end, not bent downwards ; thicker flagellum of first 

 antenna long or moderate, bifid ; scale of second antenna 

 long, usually narrow; second maxilliped with penultimate 



