62 ϐ, 0. SARS, [ν. 8.11 
Black Sea, viz., Odessa and Oczakow, being in the first-named place extract- 
ed from the ventricle of Perca fluviatilis, together with M. intermedia. 
4. Mesomysis. Czerniavskyi, G. 0. Sars, n. sp. 
(Pl. V.) 
“Specifies Characters. — Very like the last species, ο. Së a 
little more slender in form (see Pl. V, fig. 1).; Carapace having the cephalic 
part scarcely narrower that the Let segment of metasome, its anterior edge 
evenly curved in the middle, frontal spine, uncovered. Eyes (see fig. 2) pyri- 
form; reaching somewhat beyond the sides, of the carapace, corneal part 
well-developed..and-distinctly emarginated : on. the... dorsal face. Antennal 
scales (see fig. 3) exceeding the peduncles of the superior antennz- by. about 
ἵ of their length, and oblong linear in, Bam, but; very little attenuated 
distally, terminal part in front of the outer corner (fig. 4) occupying about 
1 of the length of the scale; apical segment well-defined. Pereiopoda (fig..6) 
and pleopoda (figs. 12; 18) in both sexes.of much the same structure as in 
M. Kowalevskyi. Telson (fig: 8) scarcely longer than the last segment of meta- 
some, and about twice-as long as it is broad at the base, outer part, some what 
attenuated, lateral edges but very slightly flexuous;: and armed, each with : 
about 18 spinules, apical sinus (see fig. 9) extremely shallow, nearly,obso+ 
lete; its:edge bordered: with 1 6—1 8. regular {dentiform. projections, ‘spines 
of the outher eörners:not very strong. Inner lamella of the uropoda (fig: 10) 
not much 'tumefied at the base, and having the otolith very small, inner edge 
armed, below the marginal setze, with about 7 spines, i 3 onien 9869 being κ 
somewhat wider apart than the: 4- inner: Body: without istinct: dendritie 
ramifications; though having the usual -dorsal pigmentary ο Length 
of adult pans — hSiemisviterse rn 
»— The present; nds species, which. n isi sat in. gaz 
of the distinguished Russian nat tMr. Czerniavsky; a very nearly 
allied to AM. KEE though apparently, distinety differing, as,it,does, 
rather conspicuously in the want of the rich dendritic. ramifications ornar 
menting the body of the former species, and: also. be: Ee apical, sinus ud the 
telson being so very shallow as nearly to: be obsolete... :.... 
^Occurrénce; — Some specimens, females and rem of this: Fe were 
| toniaiitod;; in the collection of Warpachowsky, and occurred at Stat. 27, 
lying at the southern point of the Island, οἵ. Κα]α]γ,. north ofthe selena 
- ee 
Melanges biologiques. T. XIII, p. 410. 
