220 THE SCHIZOPODA. 
ously broader or even nearly twice as broad as the basal part and very broadly 
rounded with the terminal margin somewhat or feebly convex; besides the process 
is a little excavated on the anterior surface along the terminal margin, which 
consequently is a little raised (fig. 1f). The proximal process (p*.) far from reach- 
ing the end of the terminal; the basal part is thick, and then the process is 
abruptly bent considerably inwards and its terminal third curved again in the 
opposite direction; at the proximal bend a short or rather long “‘heel” projects 
on the outer side; the distal third is somewhat compressed with a couple of 
irregular teeth on the very oblique terminal margin (fig. 1g, which shows the 
distal part seen from the outer side). The median lobe with the proximal half 
broad; the lateral process (p*.), which is inserted at the middle of the inner mar- 
gin of the lobe, is rather long, moderately slender, with the most distal part 
bent strongly inwards and forwards. The additional process (p*. and fig. 1h) 
is a strong hook, the major, proximal part being oblong, a little curved and 
strongly vaulted on one side, and the distal part is somewhat slender, acute, 
and curved strongly outwards; when the organ is seen from behind (fig. le) 
the major part of the process is covered by the distal part of the lobe, the end 
of which is broadly rounded. A little beyond the insertion of the lateral process 
a secondary additional process (p°.) is observed on the posterior surface of the 
lobe; this process is quite small and shaped as a straight needle. The auxiliary 
lobe of moderate size. The setiferous lobe is moderately broad, with setae along 
nearly the whole inner margin, the oblique distal end and the proximal half of 
the outer margin, while most of the distal part of this margin is naked. 
Length of the largest female from the Pacific 29 mm., of adult males 24— 
29.5 mm. Specimens from the Atlantic are much larger; the Monaco collec- 
tion contains a female 40.5 mm. long and a male 40 mm. long, while Ortmann 
stated that his single specimen measured 44 mm. in length. 
Very young Specimens.— Figs. 1k-1m show parts of a young specimen 
measuring 11 mm. in length. The frontal plate is long, much longer than in 
the adult, somewhat shorter than broad, with the distal third of the lateral 
margins somewhat convex, and terminating in a small, nearly spiniform, hori- 
zontal rostrum; the upper side of the plate longitudinally concave, without sub- 
median keels, and the median keel begins somewhat behind the frontal end, 
increasing conspicuously and regularly in height to the dorsal organ. The cara- 
pace has a very distinct tooth on the lateral margins a little from their posterior 
end. The eyes differ much from those in the adults; seen from above (fig. 1k) 
the stalk is much thickened; seen from the side (fig. 11) the eye is much higher 
