34 Rev. T.R. R. Stebbing on Sesstle-eyed Crustaceans. 
described as having the joints of the hinder legs slender, 
naked, and destitute of spines. A specimen in my possession, 
of C. lobata, has on one side of one of its hands an extra 
spine, illustrating the possibility of variation in an animal not 
under domestication. 
Stimpsonia chelifera, Spence Bate. (Pl. V. figs. 2 & 3.) 
This species has been already figured and pretty fully 
described by Mr. Spence Bate in his Museum Catalogue, and 
by Messrs. Bate and Westwood in their well-known work. 
Nevertheless the examination of several specimens taken on 
the shores of Torbay has brought to light some peculiarities 
that seem well worthy of notice. 
The secondary flagellum of the upper antennee is not uniar- 
ticulate, but two-jointed, the second articulation being rather 
the longer, and the two together slightly exceeding in length 
the first articulation of the principal flageilum. In the lower 
antenne there is a character which appears to develop itself 
only in the adult male. The long penultimate joint of the 
peduncle is at the base as deep as the thick deep joint which 
precedes it; this dilatation is slight on the upper margin, 
where it affects the whole thickness of the joint, but is consi- 
derable on the lower margin, where it takes the form of a 
large flattened lobe. The preceding joint has its distal margin 
more or less deeply indented in all specimens, as if prepared 
to give a suitable holdfast to its dilated successor; but from 
the variety of the dilatations themselves it may be inferred that 
they are only acquired in very advanced age. 
In the first gnathopods the long infero-distal process of the 
wrist varies greatly in length, sometimes not reaching nearly 
to the extremity of the hand. In the space between this 
process and the hand, but nearer to the latter than the former, 
there is a small tooth, with long sete springing from both 
sides of it. Three or four transverse rows of sete line the 
lower margin of the wrist. The inner margin of the hand 
does not follow the uniform curve of the outer margin, but, 
beginning with a concavity, bulges centrally; it has three 
rows of sete. There are three other groups on the inner face 
of the hand, and two groups on the outer margin, one centrally, 
the other distally placed. The coxe of these gnathopods 
have the infero-anterior angle produced under part of the 
lower margin of the head, 
The second gnathopods have a small process at the anterior 
distal angle of the.basos. The almost rectangular metacar- 
pus has its distal margin fringed with sete of various lengths, 
without regularity in the line of insertion; along its lower 
