Nicholls — Two New Phreatoicids, 
197 
with long aetne, the postero-hiteral eoriier crenatOj with more closely 
set setae. 
The eiidopodites are, as usual, thin transparent laminae without 
fringing setae, tlie exo])odites (with the exception of that of the 
tirst pleopod) divided into a large proximal and an unusually short 
distal lobe. Tliis latter is almost coni})letely fringed with plumose 
setae, such setae being continued proximally along the greater part 
of the lateral bor<ler of the proximal lobe, passing presently into 
simple setae. On the mesial i)order a very few of the distal setae 
may be plumose, but the greater number are simple and these may 
extend from the edge on to the face of the plate as a thick bordering 
tuft (PI. XXVir, fig. 25, ex.). In the male, the cudo])odite of the 
second ])leo])od is differentiated in the usual manner to form a 
[)onial filament. This consists of a stout basal piece and a semi- 
cylindrical distal portion, somewhat curved, concave laterally and 
fringed along both margins with tine setae. At the apex these pass 
into a curved line of exceptionally stout setae to form a conspicuous 
terminal tuft (fig. 26, s.). 
Both rami, and the epipodite when present, spring from a basal 
piece or peduncle of rather indeterminate shape. In both first and 
second pleopods, however, it is bilobed and suggests a two-jointed 
structure; in the case of the first ])leo])od (PI. XXVII, figs. 2H, 24) 
long setae are ])resent on both lobes mesially. On the lateral border 
but a single lobe is indicated. As regards size, the first pleopod is 
the smallest, the second somewhat larger, the third largest (PI. 
XXVIll, fig. 31), the fourth and fifth progressively smaller (PI. 
XXVIII, figs. 32, 33). 
The uropods (PI. XXIX, fig. 37) consist of a stout, relatively 
short peduncle, expanded dorsally on its inner border, l)oth bordeiS 
being produced into a coutiuuous line of spines and setae. The 
inner ramus is also expanded and set with spines, tl)e slightly shorter^ 
outer ramus less ex])anded. Ventraily to the origin of the rami aie 
a couple of setae, one being quite stout, but neither are pectinated 
as in Piireatoiciis. 
Notes on the Habits of some of the Phueatoicidea. 
Geoffrey Smith, referring to the habits of the Tasmanian 
species of Phreatoicus, remarks (1909, p. 71):--“ Their movements 
are exceedingly sluggish, so that when alive they are easily dis- 
tinguished from the rapidly moving Amphipods ...” Of paJustns, 
which 1 have ko])t imder close observntion for some time, it may be 
said that while they normally creep about slowly or lie ui)on the 
side at rest (their eolour harmonising wonderfully uith that of the 
debris upon, or beneath, which they rest while feeding, and ren- 
dering them almost invisible), if disturbed they are capable of swift 
