13 
Peroderma). P. bellottii, wliick I have examined myself, has only 
3 pairs of feet developed; but behind the last pair a merely rudi- 
mentary structure is seen, whicli may perkaps represent a fourtk 
pair. Tke 3 pairs are arranged witli large interspaces (cfr. text- 
figure 1, pag. 12), in wliick small symmetrically scattered ckitinous 
parcels are found, looking like ventral parts of tke segments, burst 
from eack other by tke distension of tke body during its growtk. 
Tke feet, compared witk tkose of Sarcotretes , are smaller and of 
a somewkat different skape, and tke same may be said regarding 
tke antennæ, first maxillipeds and sipko; furtker tkere is a vestigial 
pair of 2nd maxillipeds (like tkose of Lernæa brancliialis ) about 
midway between the first maxillipeds and anterior pair of feet'; 
the dorsal shield of the cephalotkorax has quite another skape, 
being distended and burst into pieces at tke margins, probably a 
consequence of tke greater development of tke two lateral processes., 
which are kere somewkat asymmetrical and clumsily brancked at 
their outer ends. Only tke first of tke abdominal terga seems 
preserved; it is kere asymmetrically turned to tke left side on a 
slight swelling immediately bekind tke large processes. Tkese 
differences togetker with the presence of tke brancked “frontal" 
appendages seem to me to prevent tke inclusion of my Sarco¬ 
tretes in tke same genus. Speaking generally, tke latter skows more 
likeness to the genus Lernæenicus, f. ex. L. encrasicholi (Turton) 
which I know from my own examination x ); but, as already stated, 
this genus possesses four pairs of feet. 
2. The stages of metamorphosis (PI. II, Figs. 11-15, 22-26). 
A. The youngest stage which I have found agrees in tke 
main features with tke stage of Lernæa branchialis , which Claus 
x ) Tkis species has a skort median outgrowtk from tke dorsal side of 
tke cephalotkorax about at tke level of tke two large lateral processes, 
and furthermore on tke ventral side, in front of tke maxillipeds a 
pair of skort, clurnsy outgrowtks. Tkese structures as well as tke 
maxillipeds and maxillæ have been overlooked by A. Scott (19 b, 
p. 94, PI. II, Figs. 6—9). 
