(XXXVI) | CRUSTACEA CASPIA. 67 
increasing in length, the outmost issuing from the tip itself. Body exhibit- 
ing dorsally the usual row of pigmentary centres, which only show a slight 
attempt to a dendritic ramification. Length of adult female 8 mm. 
Remarks. — The present peculiar Mysidian, which I have much plea- 
sure in dedicating to its discoverer; Mr. Warpachowsky, cannot be con- 
founded with any of the other known forms. In its outer appearance it bears 
‘a certain resemblance to some of the species of the genus Mysidopsis, for 
example Mysidopsis didelphys, and the telson is also of a rather similar aspect 
to that of the said species; but the rhomboidal shape of the antennal scales 
at once distinguishes this form from any of the species of Mysidopsis. The 
peculiar, as it were, mutilated appearance of the posterior pairs of pereio- 
poda may also, without dissection, be easily observed. 
! Occurrence. — Of this form 4 specimens were contained in the collec- 
tion of Warpachowsky. They occurred at Stat. 27, together with Meso- 
mysis Czerniavskyi and Limnomysis Benedent "1 
Gen. 4. Limnomysis, Czern., 1882. 
Generic Characters. — Form of body (see Pl. VIIL, figs. 1 and 18) 
comparatively slender. Carapace imperfectly obtecting the posterior part 
of mesosome, cephalic part well-defined, and having the infero-lateral cor- 
ners acutely produced and the anterior edge considerably arched in the 
middle, frontal spine wanting. Eyes (see fig. 2) elongate and narrow, and 
separated in the middle by a rather wide interval. Superior antenne with 
the peduncle (fig. 3) but little dilated at the tip, male appendage (figs. 19, 
20) small and simple of structure, not hirsute, but only finely ciliated. In- 
ferior antennæ (figs. 4 and 21) with the basal part considerably produced 
at the outer corner, scale narrow lanceolate, bearing on both edges strong 
ciliated sete, apical segment rather large and peculiarly modified in the 
male (see fig. 21, 913). Anterior and posterior lips (figs. 5, 7) of the usual 
structure. Mandibles (fig. 6) of moderate size, palp having the terminal 
joint comparatively short. First pair of maxille (fig. 8) of normal struc- 
ture; 2nd pair (fig. 9) having the terminal joint of the palp oblong oval in 
form, with the outer edge minutely serrated and setiferous, exognath compa- 
ratively large, oblong triangular in form, with numerous rather short mar- 
ginal sete. Maxillipeds (fig. 10) with the basal lobe unusually large, masti- 
catory lobes, on the other hand, very small. Gnathopoda (fig. 11) rather 
slender, with the terminal joint (fig. 12) lamellar, and edged roundabout 
with numerous slender spines, each terminating in a setiform lash. Pereio- 
TT Sie additionsl specimens of this Mysidian were contained in a subsequent collection, 
and occurred at Stat. 52. 
Melanges biologiques. T. XIII, p. 415. 5* 
