236 Transactions,— Zoology. 
This species was obtained by Dana from coral-reefs at the Fijis, and 
described as above. 
Numerous specimens of a form almost identical with Dana’s species were 
obtained by me in Paterson Inlet with the dredge. They differ in having 
the palm of the second pair of gnathopoda rather oblique and furnished 
with irregular dentations (see pl. XVIL., fig. 4a), and in the fifth pair of 
pereiopoda being rather longer than the fourth. The length varied from 
4 to 3 of an inch, and all were of a uniform yellowish-white colour. 
Another form of the same—apparently variable—species was obtained 
under stones, between tide-marks, from the same locality. Besides being 
of slightly larger size, it was of a dirty green colour, and had the teeth of 
the palm of the second gnathopod more sharply defined, in this respect 
resembling the typical form (see pl. XVIL., fig. 43). 
A third form, with a more sharply defined palm still than the last, and 
_ with longer spines and numerous hairs on the propoda of the second gnatho- 
poda, was taken by the dredge in Port Pegasus from a depth of 5 fathoms. 
(Originally described by Dana from Fiji specimens). 
2. M. petriei, n.sp. 
. Pl. XVIIL., fig. 3. 
Coxe not so deep as their respective segments. Fourth segment of pleon 
produced into two acute spines on its postero-dorsal margin, and having e 
postero-inferior angles also acutely pointed. Eyes oblong, black. Supervor 
antenn@ as long as the body ; peduncle having its first joint as long as ai 
second, but twice as broad, third short; secondary appendage shorter than 
last joint of peduncle, about 6-jointed ; flagellum subequal with peduncle, 
very many-jointed (about 50-60), joints at first more than twice as long *° 
broad, all setose. Inferior antenne less than half as long as superiors 
flagellum about 14-jointed, half as long as the peduncle. First pair of 
gnathopoda having the carpus and propodos subequal, the latter oblong; 
with an ill-defined oblique convex palm and a slender curved dactylos ; 
dense rows of hairs occur on the extremity of the meros, and transversel¥ 
on the lower side of the carpus and margins of the propodos, while the latter 
also bears numerous oblique or transverse rows of short spine-like hw 
Second pair of gnathopoda very large; basos deeply hollowed out in front, 
so as to form a groove for the propodos; ischium, meros, and carpos sit 
short, the latter about three times as broad as long; propodos large, ovale, 
distally produced into a large curved tooth on each side of the articulatio? 
of the dactylos, terminal half of the lower surface with a deep gt00¥° ” 
receive the dactylos, whole lower surface very densely fringed with two rows 
of long simple hairs ; dactylos strong, arcuate, sinuously toothed oP = 
inner margin, blunt, First and second pairs of pereiopoda slender, thre? 
