kaa KA TA WS aa a R ia L hee a aa tuii e i a a a 
G. M. Taomson.—New Zealand Crustacea. 245 
Superior pair consisting of a stout peduncle, bearing a crown of cilia and a 
small tuberculate appendage, with a flagellum of two long slender articula- 
tions. Inferior antenns four-jointed; first three joints subequal, with 
numerous cilia ; fourth joint very short and furnished with a few long hairs 
at its extremity. First pair of gnathopoda with the carpus antero-inferiorly 
produced to an acute point almost to the extremity of the propodos, serrated 
on both margins, with numerous slender spines surrounding it near the 
base of the propodos; propodos narrow-oblong, serrated on both margins, 
with a small dactylos which antagonises with the extremity of the carpus. 
Second pair of gnathopoda similar to first, but rather larger, and with the 
carpus produced slightly beyond the extremity of the propodos. First two 
pairs of pereiopoda with the basos somewhat dilated; meros, carpus and 
propodos diminishing uniformly in size and quite smooth; dactylos very 
small, acute. Third pair with the margin of the basos quite smooth, and 
the distal extremity sub-acute ; ischium articulating subapically within the 
posterior margin ; remaining joints about half as long ns the basos; meros 
and carpus quite smooth; propodos slender, slightly longer than the pre- 
ceding joints, and serrated on the posterior margin only. Fourth pair of 
pereiopoda with the basos posteriorly arcuate and anteriorly excavate, 
rounded at the extremity; ischium articulating within the posterior margin 
near the centre; remaining joints about one-third as long as basos ; meros 
very small; carpus long; propodos half its length, both serrated on the 
posterior margins; dactylos long, nearly straight, sub-acute. Fifth pair of 
pereiopoda membranous; basos curved forward nearly to a right angle ; 
remaining joints represented by a small tubercle. Three last pairs of 
pleopoda foliaceous; ante-penultimate pair having a short pedunele, the 
rami somewhat unequal, margins smooth; penultimate pair with a long 
peduncle and rami subequal, outer ramus finely serrate on its outer margin ; 
ultimate pair with the peduncle rather short and rami very unequal; 
external ramus minute, lanceolate, with smooth margins; internal ramus 
oblong, oblique, finely serrate on the distal half of both margins. Telson 
iriangular, obtusely pointed. 
Colour yellow, nearly transparent, with small red spots. Length :5 
inch. Can roll itself almost into a ball. 
Washed up on the Ocean Beach at Dunedin. 
I have named this species as above, from the fact that it is almost inter- 
mediate between the only two species hitherto described— P. rissoine, Bate, 
and P, serratus, Bate. 
Spence Bate remarks of this genus :—“ It appears to me to be not 
improbable that Platyscelus may prove to be the female of Typhis(Thyropus), — 
from which it differs, only in the form of the superior and length of the - 
inferior antenne.” 
