64 α. 0. SARS, [n.s.ıv 
cated antennal scales, and by the comparatively more slender pereiopoda. 
It is also of rather inferior size. Mr. Czerniavsky records also of this spe- 
cies 2 forms or varieties; the one, ,,forma typica“ is said to have the apical 
sinus of the telson very shallow or scarcely distinct, the other, ,,forma 
truncata‘‘, to have the telson nearly transversely truncated at the tip. In 
the figures, however, the telson is everywhere represented as quite trans- 
versely truncated, without any trace of an insinuation of the apical edge. 
Occurrence. — A few specimens, males and females, of this species were 
contained in the collection of Mr. Warpachowsky, and occurred at Stat. 
15, together with Paramysis Baeri. According to Mr. Czerniavsky, 5 
specimens of the typical form were collected by Prof. Kowalevsky at Pe- 
trowsk (?). 
Distribution. — Black Sea: a single specimen of the ,,forma truncata“, 
extracted from the ventricle of a Perca fluviatilis, caught at Odessa (Czer- 
niavsky). 
6. Mesomysis aberrans, Czern. 
Mesomysis aberrans, Czerniavsky, l. ο. fasc. 2, p. 54, Pl. XXIII, figs. 16—21. 
Remarks. — I have not myself had an opportunity of examining this 
form, but it may be here mentioned, as it is stated to occur in the Caspian 
Sea. To judge from the description and figures given by Mr. Czerniavsky, 
this species is very nearly allied to M. intermedia, differing, however, by 
the anterior edge of the carapace being so much produced in the middle as ` 
to nearly quite obtect the frontal spine, and by the apical edge of the telson 
being not transversely truncated but even somewhat convex, though armed 
in the usual manner. 
Occurrence. — The specimens examined by Mr. Czerniavsky, were 
collected by Prof. Kowalevsky at Petrowsk (?). 
Gen. 3. Katamysis, G. Ο. Sars, n. 
Generic Characters. — Form of body (see DL VII, figs 1 and 21) short 
and stout. Carapace imperfectly obtecting the posterior part of mesosome, 
and having the cephalic part rather short, with the anterior edge angularly 
produced in the middle; frontal spine present. Eyes (see fig. 2) scarcely 
expanded distally. Superior antennæ (fig. 3) of the usual structure, male 
appendage very large and densely hirsute (see fig. 21). Inferior antennæ 
(fig. 4) with the basal part scarcely at all produced at the outer corner, 
scale very short, rhomboidal in form, with the outer edge smooth and ter- 
minating in a dentiform projection, inner corner much produced and exhi- 
biting a distinct apical segment (fig. 5). Anterior lip (fig. 6) armed in front 
Melänges biologiques, T. XIII, p. 412, 
