70 - 6. 0. SARS, [N. S. ıv 
at the base, its outer part being abruptly constricted and slightly attenuated 
distally, lateral edges somewhat concaved, and armed each with about 10 spi- 
nules, the 6 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, terminallobes scarcely diverging and tipped 
each with a rather 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 
setze, 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. 
Remarks. — The very peculiar sexual difference 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 aestuarica, 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 aestuarica, 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 1). 
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. pontica; the 2 other varieties were collected by Prof. 
Meeznicow at Liman Berezan (near Oczakow). 
1) This form was also abundantly represented in a subsequent collection, and occurred in 
4 different Stations, viz., St. 49, 50 (off Tschistyi Bank), 51 (at the island of Kulaly), 52. 
Mélanges biologiques. T. XIII, p. 418. 
