The Schizopoda collected by the Maia and Puritan in the Mediterranean. 131 
genus Euchaetomem, without comment. The antennal scale in 
Mysidae lias always been regarded as an appendale from which to 
derive characters valuable for Classification of the various species 
into genera. The scale of Euchaetomera merolepis differs so markedly 
from that of the other members of the genus, that the Institution 
of a new genus for its reception seems clearly called for. 
The new genus Euchaetomeropsis may be defined as follows: 
Having the characters of Euchaetomera Gr. 0. Sars except: Antennal 
scale narrowly lanceolate in shape, setose ali round, with a minute 
2. joint at the apex. — Type species: E. merolepis lUig (1908). 
17. Euchaetomeropsis merolepis (Illig). 
Euchaetomera tenuis (pars), Lo Bianco (1903). 
Euchaetomera me?vlepis, Illig (1908). 
nec E. tenuis, G. 0. Sars (1885). 
Illig's specimens, both females, measured only 4 and 5 mm, 
but in the present material one female measured 9 mm and two 
males 8 mm, ali three apparently adult. I am, therefore, able to 
Supplement Illig's brief diagnosis in one or two points though 
none of my specimens are perfect. 
In the adult male the antennular peduncle extends to the level 
of the apex of the antennal scale. The 3. joint is about equal in 
length to the first but considerably more robust and bears on the 
ventral distal edge a densely hirsute lobe, as in male Mysids generally. 
The outer distai corner of the basai joint bears a long setae, as 
long as the remainder of the peduncle. 
The antennal peduncle is slender, not quite as long as the 
antennular and has the last joint little more than half as loug as 
the preceding one. 
The pleopods of the male conform to the general type of the 
Leptomysinae. 
None of the above specimens bave the telson perfect but from 
a study of the material as a whole the armature of the apex 
appears to be as follows: — 
At each angle there is a single small very slender spine and 
between these, 2 very long and stout setae, set about as far apart 
as in E. tenuis and extending about two thirds of the way down 
the inner uropods. These apical setae appear to be simple, instead of 
piumose as in the species of Euchaetomera. In the above mentioned 
note on this species by Holt & Tattersall it was stated that the 
