Mr. C. Spence Bate on a new Genus of Macrura. 69 
broad and furnished on the outer side with a wide and sharp- 
pointed stylocerite, which is of great tenuity and free from 
cilia, whereas the inner side of the shaft of the appendage is 
fringed with a few simple cilia. The second joint is about 
half the length of the first and more free from cilia, there 
being only three or four on the inner margin. The third 
joint is very short, but nearly as broad as the preceding, and 
is furnished with a bundle of long hairs on the inner distal 
angle; it supports two short flagella, of which the outer 
is the shorter, and carries towards its distal extremity a 
series of membranous cilia. The inner flagellum is sub- 
equally robust with the outer one, but free from cilia of any 
kind. 
The second pair of antenne (c) are furnished with a long 
ovate scaphocerite, the outer margin of which is rigid, and at 
the distal extremity, where a small tooth generally exists, the 
rudiment only of one is seen; the squamose portion is of 
extreme tenuity and projects distally beyond the rigid margin, 
and is fringed with numerous fine ciliated hairs ; on the inner 
side of the scaphocerite is another joint that is short and 
robust, from the distal extremity of which projects a long and 
slender flagellum that is somewhat rigid and gradually tapers 
to its extremity. 
The mandible (d) consists of a smooth and pointed psali- 
stoma which is in continuity with the slightly projecting molar 
process, having on the anterior margin a short three-jointed 
synaphipod, the two distal joints of which are fringed with a 
few strong hairs. 
The first siagonopod (e) is three-jointed and three-branched : 
the first joint is short, robust, and produced on the inner side 
into a large flattened process fringed with hairs: the second 
joint is narrower than the first, but not much longer; it has 
its distal extremity, which is broad and oblique, fringed with 
short, stiff, tooth-like spines; on its outer margin a small 
uniarticulate branch exists, which is adorned with two slender 
and rather long hairs at the distal extremity. 
The second siagonopod (/) is of five branches, all of which 
are foliaceous and of extreme tenuity, and are unibranched, 
excepting the second, which is biramose ; the fourth branch is 
shorter than the others, narrow, and sharp-pointed ; while the 
fifth or outer one is broad and long, being equal in size to the 
three on the inner side ; itis also pointed anteriorly and broad 
posteriorly, and represents homologically the mastigobranchial 
appendage, just as the fourth joint represents the continuation 
of the theoretical limb. ‘The first three or inner branches are 
