T. XIIl] CRUSTACEA CASPIA. 415 



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 Warpachowsk3 r . They occurred at Stat. 27, together with Meso- 

 mysis Gzerniavskyi and Limnomysis Benedeni l ). 



Gen. 4. Limnomysis, Czern., 1882. 



Generic Characters. — Form of body (see PI. VIII, 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 antennae 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 antennas (figs. 4 and 21) with the basal part considerably produced 

 at the outer corner, scale narrow lanceolate, bearing on both edges strong 

 ciliated setae, apical segment rather large and peculiarly modified in the 

 male (see fig. 21, 21*). 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 maxillae (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 setae. 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- 



1) Some additional specimens of this Mysidian were contained in a subsequent collection, 

 and occurred at Stat. 52. 



Bulletin N. S. IV (XXXVI) p. 67. 29* 



