256 THE SCHIZOPODA. 
lobe therefore overlapping a very small portion of the next joint; the inner tooth ° 
of the lobe is generally longer and stouter than the outer. Second joint conspicu- 
ously longer than third, with its dorsal wall produced feebly in front above the 
base of third joint and the upper terminal margin near the outer side produced 
in a low, acute angle (fig. 3d); third joint, seen from the side (fig. 3c), with the 
dorsal keel occupying somewhat more than half of the upper margin, moderately 
high and increasing in height to the end which in well-preserved specimens is 
produced in an acute denticle, while the front margin is steep, not quite vertical.— 
The antennal squama somewhat broad, with the terminal margin of middle 
length, transverse, without tooth at the outer margin. The spiniform process 
from the outer side of the peduncle short, less than one fourth or one fifth as 
long as the squama. 
First and second abdominal segments at the middle of the upper posterior 
margin a little produced, but the protuberance is broadly rounded. Third seg- 
ment a little expanded backwards at the middle of the hind margin and pro- 
duced in a somewhat short, strong, conspicuously compressed, acute process, 
which has the upper margin a little curved, the lower straight, and the process 
is continued a little forwards as a keel. Fourth and fifth segments with the 
hind margin distinctly produced in the median line, forming either a sharp 
angle or a very short denticle. Sixth segment moderately long, somewhat 
less than twice as long as deep. Preanal spine wanting in both sexes.— Uropods 
with the rami subequal in length and as long as, or a little shorter than, the 
telson. 
The copulatory organs (figs. 3e-3g) differ in several features from those in 
allied forms. The terminal process (p’.) with the foot moderately long, the heel 
rather short but considerably curved, the part beyond the foot moderately long, 
somewhat slender, proximally straight, distally curved considerably inwards 
and forwards and with the terminal part a little expanded and flattened, very 
oblong-oval with the end blunt. The proximal process (p*.) is of very moderate 
length; almost all the proximal half is rather stout and a little bent before its 
middle; the distal half is bent strongly inwards and tapers considerably to not 
far from the end, while the terminal portion is abruptly very much expanded, 
seen from the inner side (fig. 3g) forming a broad plate bent strongly backwards 
(in the figure therefore to the right), and with a sharp, protruding angle on its 
proximal part; seen from behind (fig. 3f) this terminal plate is oblong, somewhat 
expanded upwards, and this expanded part seemingly proximally produced 
into a long tooth crossing the posterior surface of the process and projecting 
