165 



typical foiMiuila — distiuctly treuding upwards at apex and reaching 

 2 mm. beyond the distal end of the antennal scales. 



The preceding observations indicate that these specimens from 

 Oran difFer from the typical species l)y the shorter ramus of the 

 outer antennular flagellum ineasuring more Ihan two-thirds the 

 lengtli of the pediiucle and by the more slender legs, especially 

 by the more slender shape of the carpus of the 2'^ legs, which 

 is hardly shorter than the chela. When these characters of the 

 mediterranean specimens should prove to be constant, it woiild 

 seem necessary to distinguish thera as a proper variety medi- 

 terranea. 



General distribution : Estuary of the Meuse, Hollandsch Diep 

 (Hoek, Tesch) ; Zuiderzee, IJ, in the Rhine near Katwijk, near 

 "Warffum, Holland (Maitland, Tesch); Noirmoutier, Vendce 

 (Fisc'HEr) ; Mouth of the Gironde, as far as Bordeaux, where this 

 shrimp is fished (H. Milne Edwards, Fischer) ; Corsika (Heller); 

 Coast of Liberia (Miss Rathbun). 



As far as I am aware, Leander lonyirostris has not yet been 

 observed nortli of Holland nor in British waters. 



Leander serratus (Penn.). 



Astacns serratus, Th. Pennant, British Zoology, t. IV, 19, PI. 

 16, fig. 28. 



Palaenwn serratus, H. Milne Edwards, Hist. Nat. Crust. II, 

 1S37, p. 389. 



Palaemon serratus^ Tn. Bell, A Itistory of the British Stalk- 

 eyed Crustacea, London 1853, p. 302. 



Palaemon serratus, C. Heller, Die Crustaceen des südlichen 

 Europa, Wien 1863, p. 263. 



Pcdaenion serratus, P. P. C. Hoek, in : Tijdschr. Ned. Dierk. 

 Vereen. (2) Deel I, 1887, p. 102. 



Leander serratus, A. Ortmann, in : Zool. Jahrb., Abth. f. Syst. 

 Bd. V, 1890, p. 517, Taf. XXXVII, Fig. 12. 



