Gen. 2. 
Petalosarsia, stebbing, 1893 . 
Sj'n: JPetalopws, G. 0. Sars. 
„ Petalomera , G. 0. Sars. 
Generic Characters. — General form of body about as in Pseudocuma, though 
comparatively shorter and more compact, at least in female. Integuments greatly 
indurated. Carapace large, with the upper face flattened and declining obliquely 
to the prominent pseudorostral projection. Exposed segments of trunk smooth. 
Eye less perfectly developed than in Pseudocuma. Superior antennje with the 2nd 
joint of the peduncle lamelliformly dilated, last ioint very small. Inferior antennse 
in female distinctly biarticulate, with an apical and a lateral seta, those in male 
attaining the length of the body. Oral parts about as in Pseudocuma. First pair 
of legs of a rather peculiar appearance, the ischical and meral joints being firmly 
connected with each other, and the carpal joint enormously developed, folia- 
ceous, last 2 joints small and admitting of being bent in against the inner face 
of the carpal one. Second pair of legs comparatively short; 3rd and 4th pair 
in female with a very small rudimentary exopodite. Pleopoda of male resembling 
in structure those in Pseudocuma. Uropoda with the stem much shorter than the 
rami, the inner of which is densely hairy inside. Telson semicircular, unarmed. 
Remarks. —This genus was established by the present author in the year 
1864; but as the name at that time proposed, Petalopus, and also that substituted 
later, Petalomera, had been previously appropriated in Zoology, the Rev. Mr. 
Stebbing has recently proposed to name the genus as above, a compound indeed, 
which is quite sure not to have been previously employed. The genus is closely 
allied to Pseudocuma, more so, indeed, than at first supposed. The peculiar 
structure of the 1st pair of legs still seems, however, to warrant the validity of 
the genus. We know at present of only a single species, to be described below'. 
3. Petalosarsia deelivis, G. 0. Sars. 
(PI. LIV). 
Petalopus deelivis, G. 0. Sars. Om den aberrante Krebsdyrgruppe Cumacea, p. 72. 
Syn: Petalomera deelivis , G. 0. Sars. 
Specific Characters. — Female. Body comparatively short and compact, 
w r ith the anterior division rather tumid and sharply marked off from the posterior, 
dorsal face boldly vaulted behind the middle. Carapace nearly twice as long as 
li — Crustacea. 
