James Carter—On Fossil Isopods. 195 
Spheroma (S. Burkartii, Bare.), is described by M. Barcena 
(Geological Record, 1875, p. 297). The Guotocican MaGazine 
for April, 1887 (Vol. IV. p. 189), contains a notice of a paper On 
New Neogene Isopoda,” by N. Andrussow, in which mention is 
made of the following :— 
Cymodocea Sarmatica, Andr. A marine genus of the Spheromide. 
Palega Anconitana, Andr. 
Spheroma Catullit, Zigno. 
at exsors, Hichw. Bull. de Moscou, 1868. 
Cymatoga Jazykowti, Kichw. Cretaceous, Bull. de Moscou, 1863. 
Lastly, let me add that Prof. K. A. von Zittel (Handbuch der 
Palzontologie, 1885, pp. 666—670) gives, besides the foregoing :— 
Arthropleura ornata, Jordan, Coal-M. Saarbriicken. 
Archeospheroma Frici, Novak, U. Miocene, Bohemia. 
Spheroma faveolatum, Costa, Post-Tertiary, Calabria. 
Armadillo molassicus, H. v. Meyer, U. Miocene, Oeningen in Baden. 
On Palega McOoyi, sp. nov. Plate VI. Figs. 1—7. 
The species about to be described is represented by three specimens 
from the Cambridge Upper Greensand, one of which exhibits the 
cephalon and first two segments of the pereion, another is tolerably 
complete except the telson, the third consists of portions of the 
pereion, the pleon, and the telson, with traces of the caudal 
appendages. As is the case with so many of the fossils from the 
same prolific bed, the specimens occur as phosphatic casts only, no 
portion of the test having been preserved: these casts are, however, 
so sharp as to afford characters with quite sufficient distinctness 
to be available for specific description. As specimens of Isopods’ 
occur so rarely, and are usually so imperfect, the distinction of a 
new species by means of mutilated examples seems justifiable. 
Description.—General form slender, moderately convex trans- 
versely ; lateral margins of pereion approximately parallel ; cephalon 
about three-fourths as wide as the first segment of the pereion, rather 
_wider than long, rounded in front, posterior border with a median 
condyloid prominence. Hyes large, reniform, widely separated, 
directed obliquely outwards and forwards; extending backwards 
beyond the transverse mid-line of the cephalon. The three anterior 
segments of the pereion rather shorter than the succeeding four ; 
a sharp sulcus marks off a large epimeron on each segment. The 
pleon is about half the length of the pereion, and rather narrower ; 
it consists of five equal, short segments, the last of which is lodged 
in the sinus of the fourth. The telson constitutes the posterior half 
of the pleon, and is as wide anteriorly as the segment which sup- 
ports it: it narrows posteriorly and kas apparently no carina. The 
surface of all the segments may be seen under the lens to be pitted 
by large, widely separated, puncta (see Pl. VI. Figs. 4&5). The 
matrix in which the specimen is embedded shows a sharp cast of 
the uropodite, the basal joint of which has the inner distal angle 
prolonged into a spine more than half as long as the endopodite—a 
character which occurs in many Aigide: the endo- and exo-podite 
are broken; they were probably of moderate and of equal size. 
