228 THE SCHIZOPODA. 
In more than half-grown, but immature, specimens the leaflet of first joint is 
more rapidly and evenly narrowed, not truncate, but with the terminal portion 
produced much upwards and considerably outwards (fig. 2f), the inner margin 
being very convex towards the acute tip and the outer considerably concave; 
the tooth at the end of second joint is much longer and the acuminate part of 
the outer distal protuberance of the first joint considerably longer than in the 
adults.— The antennal squama does not reach the end of second antennular 
joint (fig. 2a); its terminal margin is transverse or a little oblique, with the outer 
denticle very distinct; the two distal joints of the stalk of the endopod are 
similar in both sexes. 
Sixth abdominal segment with a distinct dorsal spiniform tooth at the end. 
The copulatory organs (figs. 2h—2i) afford some specific characters. The 
distal half of the inner lobe (li.) is subtriangular, rounded at the end; the distal 
two thirds of the free outer margin of this lobe is serrate, and its proximal half 
shows two obtuse protuberances between which the margin is rather concave. 
The median lobe (lm.) is extremely short, cut off transversely, and from the 
inner part of the terminal margin the somewhat long lateral process (p*.) pro- 
jects; this process is bent a little outwards at the acute end. 
Length of the largest male 11.5 mm., of the largest female 14 mm. One of 
Ortmann’s males from the Gulf of Panama is 13.2 mm. long. 
Very young Specimens! (Plate 7, figs. la-lb).— The specimen figured 
measures 7 mm.; other somewhat smaller specimens are at hand.— The frontal 
plate is at the base as broad as the carapace; it is much produced, longitudinally 
concave, its lateral margins are sinuate, being proximally convex and distally 
concave, and the plate is distally truncate, even flatly emarginate, each angle 
being produced in an acute tooth; at the end the plate is about one third as 
broad as at the base. In the largest specimen the carapace has scarcely any 
angle on the lateral margin somewhat before the hind margin, but in the other 
specimens an angle or generally a small denticle is distinct. The eyes are 
extremely large. The leaflet of first antennular joint in the largest specimen 
directed upwards and somewhat backwards, somewhat excavated above beyond — 
the base, a little longer than broad, nearly oblong-triangular, with the inner — 
margin straight, the outer somewhat convex, and the distal part produced in © 
an acute tip bent upwards and somewhat forwards but not outwards; in some- — 
what smaller specimens the leaflet is proportionately smaller and less developed; 
the process from the outer distal angle of first joint very long. Second and © 
third antennular joints in the main as in the subadult. 
1 The larvae of this species are dealt with, p. 288-290. 
