New Species of Caligus — Shiino 
355 
TABLE 1 
Armature Present on Swimming Legs 
LEG 
BORDER 
STERNAL 
PLATE 
PROTOPODITE 
EXOPODITE 
ENDOPODITE 
I 
II 
I 
II 
III 
I 
II 
III 
I 
outer 
inner 
Is, Ip 
IP 
Irh 
c 
3H, IH 
3P 
11 
outer 
inner 
f 
Is, IP 
f. Is 
f. Is 
f, IH 
c, IP 
IH 
c, IP 
2H, IQ 
5P 
C 
IP 
CC 
c, IP 
c 
6P 
III 
outer 
inner 
f 
f. Ip 
IP, f, 2s, c 
IH', c 
c, IP 
c, 3h 
4P 
IP 
IV 
outer 
inner 
IH 
3H 
Abbreviations: c, row of hairs; CC, area covered with spinules; f, membraneous flange; H, stouter simple spine; h, feebler 
simple spine; H', hooklike spine; P, stouter plumose spine; ph, feebler plumose spine; Q, spine rimmed with hairs on one side, 
with membrane on the other; rh, tiny spine; s, solitary hair. Roman numerals represent the ordinals of legs or of joints and 
Arabic numerals denote the number of spines, or of other armature present on each of them. 
the same as those on the spines just named. 
External spine on the first two exopodite 
joints of the same legs acuminates toward the 
tip and has pectinate rims along two opposite 
borders; that of the first joint accompanies a 
basal lamina with parallel striation on its 
surface. The basalmost of external spines on 
the third joint of the same exopodite is much 
reduced in size, without rim; the middle spine 
has a broad striated membrane on the inner 
side, and the terminal one bears an inner row 
of hairs besides the outer membrane. Basal 
hook on the exopodite of third legs ends in 
a straight apex which is narrowed to a point 
resembling an arrowhead. Terminal spines on 
the fourth legs are equal in length except the 
outermost, which is slightly shorter; all of 
them are doubly edged with a narrow rim and 
associated at the base with a fusiform lamina, 
circumscribed with pectination. Spine on the 
second joint is simple and devoid of basal 
lamina. Genital segment lacks any trace of 
fifth legs. Caudal rami are small in size and 
terminate in three plumose spines, which are 
attended outside with two similar, but much 
shorter, spines and inside with another short 
one. Inner margin of the rami is fringed by a 
short row of hairs. Egg strings are longer than 
the body and packed with uniserial, flat- 
tened eggs. 
REMARKS 
The new species is characterized, above all, 
by the enormous size of its genital segment, 
which surpasses the carapace in length and 
width. In the genus Caligus, there are a num- 
ber of species which present certain resem- 
blances to the new species in the outline of 
this segment, in its size relative to that of the 
carapace, and in the possession of a small 
one-segmented abdomen. To facilitate dis- 
tinction of klawei from such species some of 
the characters are summed up in Table 2. 
As may be seen from this table, no species 
has a genital segment so strongly expanded as 
that of klawei. It is, however, close to poly- 
canthi, glandifer, fistulariae, and macarovi in 
the outline of this segment. The first of these 
has the second maxillipeds stouter than in 
klawei, the second has the same limbs feebler, 
and the others are longer in the abdomen, 
which in them extends considerably beyond 
the foregoing segment. 
The specimen will be preserved in the mu- 
seum of the Prefectural University of Mie. 
