117 



soine cotypc's of P. rerfirosfri.s Zaddach and its variety octoih'n- 

 tafiis R. Neumanii. 



The following species aro here described: 



Leatnhr HquiJJa (ijumé). Typical form. 

 „ „ var. intermedia n. 



„ „ var. elegans (Rathke). 



„ adspersus (Rathke). Typical form. 

 „ „ var. Fcf.br/rii (Rathke). 



„ lonc/irosfris (H. M.-Edw.). 



„ serrafifs (Penn.). 

 „ „ var. Treillitma (Risso). 



„ xiphias (Risso). 



II. Ei(r()}K'((ii .yx'des of the genus Leandcr Desin.^ not described 

 in this paper. 



\° Leaudrr feindeornis (Say) = L. natafor (II. M.-Edw.), the 

 well-known species froiii the Sargassum-Sea. 



2°. Palaenion brevirostris Andrz. from tlie Black Sea. (A. Andrzei- 

 owsKi, Catalogue des objets qui se conservent dans Ie Cabinet 

 Zoologique de l'l'niversité Impériale de St. Vladimir a Kief. 

 lèie Partie : Mammifères, Oiseaux, Reptiles, Poissons et Crusta- 

 cés. 1838, in: Buil. Soc. Imp. Naturalistes de Moscou. Mos- 

 cou 1839). This species does probably not occur in Czerniavsky's 

 work „Crustacea Decapoda Pontica Littoralia" of 1884, but 

 it has been mentioned by Dr. J. Thallwitz in his List of 

 the Species of Palaemonidae (Decapoden-Studien, 1891, p. 7). 

 The diagnosis of P. bremrostris, given by Andrzeiowski (1. c), 

 is the following: „rostro tetragono-ancipiti, maxillis breviore 

 dentibus adpressis siipra 6 — 7, subtns 1 — 2 minimis donato, 

 digitis manui aequalibus". 



3° Leander imbellis (Fischer) from the Bay of Arcachon. (P. 

 FiscHER, Crustacés Podophthalmaires etc. Paris, 1872, p. 20). 

 This species is closely allied to L. adspersus (Rathke), but 

 differs bv the shorter rostrum, the lower margin of wliich is 



