Amphipoda with notes on a species of Isopoda. 
439 
to me. But though the telson in this specimen is almost symmetrical, it is devoid of 
setae and has every appearance of having been injured at some period, and I regard 
it in this light. Otherwise the specimen is in very close agreement with the published 
descriptions and figures of C. carinata. In support of my identification I have given 
figures of some of the appendages of my specimen. They will be found to agree very 
closely with the figures given by Norman and Stebbing (1886) and Richardson (1905). 
The flagellum of the first antenna (pi. XVIII, fig. 3) is composed of two joints with 
possibly a minute third. Norman and Stebbing give four joints, while Richardson on 
the other hand figures only one. The flagellum of the second antenna (pi. XVIII, 
fig. 4) is composed of a single joint and this agrees with the figures and statements 
of both the authors named above. The thoracic legs agree absolutely with the des- 
cription of Norman and Stebbing even to the pectinated spine at the distal extremity 
of the palm. The powerful second thoracic legs (pi, XVIII, fig. 5) as well as the 
remainder of these limbs bear a small secondary nail on the inner margin of the finger. 
I have been unable to find any satisfactory account of the pleopods in the 
species of this family. They would appear to form an admirable basis for classifica- 
tion. In the present specimen the inner branch of all the pleopods is branchial in 
structure and not natatory and is devoid of plumose or simple setae of any kind. 
It is in all cases opaque and narrower than the outer branchand in the case of the first 
pair (pi. XVIII, fig. 9) much smaller. Both inner and outer rami in all the pleopods 
are composed of a single joint. Norman and Stebbing do not describe or figure the 
pleopods of this species. Harger (1880), however, figures the first and second 
pleopods and they agree with my own observations. His description is as follows : — 
" The first pair of pleopods are composed on each side of a short, quadrate basal 
segment supporting two rami, of which the outer is, like the basal segment, of firm 
texture, and acts as an operculum ; in shape it is semi-oval, with the inner margin 
nearly straight, and is ciliated distally, and along the outer margin. The inner ramus 
is much smaller than the outer, and of delicate texture, and in the natural position is 
covered and concealed by the outer ramus; it is slender, with nearly parallel sides, 
rounded at the tip, and not ciliated. " 
I have quoted this description in full because it agrees so well with what I have 
myself observed and because it represents the only account of the pleopods of this 
species which I have seen. 
Other writers have said very little about the structure of the pleopods in this 
family. Sars (Crustacea of Norway, Vol. II, Isopoda) figures the first pleopod of 
Calathura norvegica as composed of single- jointed rami, the inner setose distally ; 
while his figure of pleopod two shows the rami to be each two-jointed, the inner setose 
distally. The pleopods of Leptanthura tenuis appear to be of substantially the same 
form. In Ptilanthura tenuis the first pair of pleopods have the ram.i single-jointed, 
the inner setose distally, while in the second pair Harger describes the outer ramus 
as imperfectly articulated near the middle. In Anthelura remipes Barnard describes 
the second pair of pleopods in the female as having the rami obscurely two-jointed 
and the same would appear to be the case in Leptanthura faiirei , Barnard. 
