178 Transactions.— Zoology. 
is a rudimentary secondary appendage only about half as long as the 
first joint of the flagellum. Peduncle of lower antenna equal in length to 
that of the upper, the last two joints equal in length. Appendage of the 
mandible three-jointed, the second joint larger than the first, the third short 
and curved. Second gnathopoda more slender than the first. Last three 
pairs of pereiopoda increasing in size from before backwards, the various 
joints being pretty abundantly supplied with stout sete. Last three pairs 
of pleopoda slender, biramous, the penultimate the smallest and having 
the rami slightly unequal, the rami in the other two being equal. ‘Telson 
short, as long as broad, the posterior border slightly concave. 
Male.—Differs in having sensory capsules and set@ on both pairs of 
antenne, and in having the gnathopoda much larger than those of the 
female. First pair of gnathopoda much larger than the second, propodos 
very large ; palm broad, defined by one long and two short spines, the long 
one being about two-thirds the length of the finger. Second pair much 
smaller, palm defined by a short, stout spine. Colour—transparent. 
Length of female (with eggs), *3inch. Male (largest specimen), *5 inch. 
Hab. Pump at Eyreton. 
This species differs from the other species of Calliope in the absence of 
eyes and in the presence of a rudimentary secondary appendage on the 
upper antenna, but I have not considered this sufficient to warrant ~ 
removal from the genus. The female is very abundant, but the male 1s 
rarely obtained. 
The number of joints in the flagella of the two antenne varies vely 
much (in the female) according to the size and therefore presumably 
according to the age of the animal. Thus in very small specimens I found 
15 joints in the flagellum of the upper antenna and 7 in the lower, while 
in full-sized specimens there were about 55 in the upper and 21 in the 
lower. 
In the male, peculiar “ sensory capsules” are found on both antenn® 
They are to be found on the last two joints of the peduncle and on the 
proximal half of the flagellum of the upper antenna; on the distal half 
simple sensory sete (fig. 4 b) ‘are found on every other joint. The sensory 
capsules are also present on all the joints of the flagellum of the lower 
antenna except the last two or three. They are cup-shaped and slightly 
constricted towards the middle, and they are situated on a slight protuber 
ance of the joint of the flagellum (fig. 4 a). On the peduncle of the upp® 
antenna of the male there are other peculiar-looking set which até 
evidently sensory. They are long and slender, with several very fin 
divergent filaments at the distal end (fig. 8). Similar capsules and wae : 
