xxxv] CRUSTACEA CASPIA. 55 
basal lobe scarcely larger than (he outer masticatory lobe, otherwise of 
quite normal structure. Gnathopoda (Pl. II, fig. 6) comparatively strongly 
built, with the terminal joint lamellar, and armed.along the exterior edge 
with a row of strong denticulated spines, the outermost of which, represent- 
ing the dactylus, is much the largest (see Pl. II; fig. 7): Pereiopoda (Pl. U, 
fig. 8) of uniform structure and rather robust, with the ischial and meral 
joints somewhat expanded, tarsal part divided into 4 articulations, dactylar 
joint very small, with the terminal claw slender and well defined from the 
joint. Outer sexual appendages of male (Pl. II, fig. 9) of moderate size, and 
slightly bilobular at the tip. Third pair of pleopoda in male (Pl. H, fig. 10) 
biramous, with the outer ramus shorter than the inner and simple. conical 
in form, terminating in a slender spine. Fourth: pair of pleopoda in male (Pl, 
IL, fig. 11) having the outer ramus much elongated, forming a slender cylin- 
drical stem divided into 6 articulations, and terminating in 2 somewhat. un- 
equal flagella, the inner of which is the shorter. and biarticulate, outer part 
of both densely spinulose. Telson (Pl. 1, figs. 11 & 12, Pl. II, figs 13. & 14) 
much elongated and strongly attenuated distally, lateral edges. spinulose, 
tip slightly incised, the incision being bordered by. only a few. scattered 
Spiniform projections, terminal lobes each tipped by a strong spine. Uropoda 
(see Pl. I, fig: ée of normal jum outer lamella much larger than the 
inner. 
Remarks. — The present genus, established by Mr, Fa Saat 
very nearly allied to the genera JMesomysis and Austromysis of the same 
author; though differing from both in a few particulars, for instance in the 
comparatively more fully developed carapace, the. rather different shape of 
the antennal scales and of the telson, and. finally, in the peculiar develop- 
ment of the exognatli of the 2 pairs of maxille. Mr. Gzerniavsky refers to 
this genus 8 species, viż., P. Baeri; P. armata and P. Ullskyi, but the last- ` 
named form is unquestionably, as will be shown farther down, not.a Para- 
mysis, but a true Mesomysis. As far as ep meni the Benes is not: repre- 
uS — the Caspian Sea. 
1. Paramysis Baeri, Czerniaysky. ` 
PL τ ἃ ΤΠ. ᾿ 
Firing Baeri, — avsky, Monographia Mysidarum imprimis se Rossiet, -e à 
"p. 36, Pl. XXVII, Pl. XXVIII, figs 1—16, PL. XXIX, figs 1—15.- x 
(olipeesfie Geen — Body (see Pl. I, fig. 1, ΕΙ. I; ae: 1). ee 
strongly built, with the anterior’ division but little attenuated in front; Cara- 
pace néarly obtecting the whole mesosome, leaving only the dorsal part of 
last segment uncovered, lateral lobes even advancing somewhat beyond the 
mesosome (see Pl. I, fig. 1); cephalic part fully as broad as the 1* segment 
Mélanges biologiques. T. XHI, p. 403. 
