70 G. 0. SARS, [n. S. IV 



at the base, its outer part being abrupt!}' constricted and slightly attenuated 

 distally, lateral edges somewhat concaved, and armed each with about 10 spi- 

 nules, the G proximal ones being separated by a longer interval from the 

 three or four outer ones, which are placed somewhat more apart, apical sinus 

 (see fig. 17) rather shallow and rounded at the bottom, its edge exhibiting 

 about 5 dentiform projections, terminal lobes scarcely diverging and tipped 

 each with a ratlier strong spine. Inner lamella of the uropoda (fig. 15) consi- 

 derably projecting beyond the telson, and having its basal part very much 

 tumefied, with the otolith rather large, inner edge armed, below the marginal 

 setae, with only a single spine, which has its place just behind the auditory 

 apparatus. Body without any distinct pigmentary ornament, the usual dorsal 

 pigmentary centres being even quite wanting, with the exception of a single 

 somewhat ramified pigmentary spot located on the basal part of the telson. 

 Length of adult female 10 mm. 



Bvniarls. — Tiie very peculiar sexual difterence in the structure of the 

 antennal scales in this form has misled Mr. Czerniavsky to describe 

 the 2 sexes as 2 different species. For his L. Schmankewiczi is without any 

 doubt only the male of his L. Benedeni. From L. Brandti the present spe- 

 cies would seem to differ by a somewhat different shape of the antennal scales, 

 but otherwise both forms seem to be very nearly allied, and their specific 

 difference may thus perhaps be questioned. M. Czerniavsky records of 

 his species L. Benedeni 3 forms or varieties, viz., forma aesiuarica, f. inter- 

 media, and f. similis, chiefly distinguished only by small differences in the 

 form and armature of the apical sinus of the telson. The form here described 

 would seem to agree most nearly with the forma acstuarica, which may be 

 regarded as the typical form. 



Occurrence. — Several specimens of this species were contained in the 

 collection of Warpachowsky, and occurred in 3 different stations, viz., 

 St. 15, 27 and 28. In the 2 first-named Stations, however, only solitary 

 specimens were collected, whereas in Stat. 28 the species would seem to 

 have occurred rather plentifully^). 



Distribution. — Black Sea. According to Mr. Czerniavsky a few spe- 

 cimens of the typical form (aestuarica) were collected by Mr. Grebnitzki 

 at the mouth of the river Dniester, and were recorded by that author as 

 Mysis relicta, var. jmntica; the 2 other varieties were collected by Prof. 

 Mecznicow at Liman Berezan (near Oczakow). 



1) This form was also abundantly represented in a subsequent collectiou, and occurred in 

 4 ditiereut Stations, viz., St. 49, 50 (off Tschistyi Bank), 51 (at the island of Kulaly), 52. 



Melanges biologiciues. T. XUI, p. 418. 



