388 Mr. L. A. Borradaile— A Revision 



Genus Pontonia, Latreille, 1829. 



Pontonia, Latreille, Ouvier'fl R. An. 2nd ed. iv. p. 96 (1829); Rnix, 

 Mem. sur les Salicoques, p. 26 (1831) ; H. M. -Edwards, 11. N. Crust. 

 ii. p. 358 (1837) ; De Haan, Faun. Jap. p. 175 (1850) ; Dana, U.S. 

 Expl. Exped., Crust, i. p. 570 (1852); Kingslev, Proc. Ac N. Sci. 

 Philad. 187!), p. 422 (1880); Joliet, Arch. zool. exper. x. p. 119 

 (1882) ; Cams, Prodr. Faun. Medit. i. p. 475 (1885). 



Pontoniida? with body depressed ; rostrum short, depressed, 

 bent downwards, not dentate, with or without a keel below at 

 the free end ; both flagella of Hist antenna short, thicker of 

 two bifid ; scale of second antenna of moderate length only, 

 broad ; flngellum of same not short ; second maxilliped with 

 penultimate joint broader than last joint and bearing it 

 terminally ; third maxilliped with last two joints narrow, 

 together shorter than the preceding joint, which is broad; 

 dactyles of last three legs straight, simple or with small 

 teeth on the underside, without basal protuberance ; one of 

 the second pair of legs with very large chela. 



1. Pontonia custos (Forskal), 177-3. (Type.) 



Cancer custos, Forskal, Descrip. anitn. p. 94 (1775). 

 Astacus tyrrhenus, Petagua, Eut. pi. v. fig. 5 [fide Risso]. 

 Gnathophyllum tyrrhenus, Desmarest, Consid. sur les Crust, p. 229. 

 Alpheus pinnophylax, Otto, Mem. Ac. cur. nat. Bonn, xiv. pi. xxi. 



Pontonia tyrrhena, Latreille, Eucycl. pi. ccexxvi. fig. 10 ; id. Cuvier's 

 R. An. 2nd ed. p. 96 (1829); H. M.-Edw'ards, Crust, ii. p. 360 

 (1837) ; id. Atlas Crust, in Cuvier's R. An. pi. lii. fig. 4 ; Heller, 

 Crust, siidl. Eur. p. 251, pi. viii. figs. 10. 11 (1863) ; Ortmann, Zool. 

 Jahrb. v., Syst. p. 50!), pi. xxvii. figs, d-i (1891). 



Callianassa thyrrlienus, Risso, Hist. Nat/ Eur. Mt$r. p. 54 (1826). 



Pontonia custos, Guerin, Exp6d. Moree, Zool. p. 36, pi. xxxvii. fig. 1 ; 

 Cams, Prodr. Faun. Medit. p. 475 (1885). 



(?) Pontonia parasitica, Roux, M£m. sur les Salicoques, p. 26 (1831). 



Mediterranean. 



2. Pontonia nipponensis De Haan, 18 ">0. 



Pontonia nipponensis, De Haan, Faun. Japon., Crust, p. 180 (1850). 

 Hymenocera nipponensis, Re Haan, toe. cit. pi. xlvi. fig. 8 (1850). 



Japan. 



3. Pontonia JlavomacuJata Heller, 1864. 



Pontonia Jlavomaculata, Heller, Yerh. zool.-bot. Ges. AVien, xiv. p. 51 

 (1864); <';mis Prodr. Faun. Medit. i. p. 475 (1885); Ortmann, 

 Zool. Jahrb. v., .Syst. p. 509 (1891). 



Pontonia diazonce, Joliet, Arch. zool. exper. x. p. 101 (1882). 



pontonia phallusiee, Marion, Ann. Mus. N. II. Marseille, Zool. i. (1883) ; 

 Courret, Compt. Rend. civ. p. 187 (1887). 



Mediterranean. 



