NEBALIADtE. 
33 
that the young are born in May, appear completely to 
refute the opinion hazarded by Mr. Thompson, of Cork, 
that they are most probably only the larvae of a Cirrhipede. 
Anatomy , Physiology , 8fc . — In the Nebalia the cara- 
pace is large, oval-shaped, and covers the whole of the 
cephalo-thoracic portion of the body, and part also of the 
abdomen. It is attached only to the head ; the thoracic 
and abdominal segments being quite free and unattached. 
It is not shield-shaped, as in the Apus, but descends upon 
the sides, and incloses the portion of the body which it 
covers, as in a bivalve shell ; the antennae, the natatory feet, 
a portion of the abdomen, and the tail protruding beyond 
it. In front, it terminates in a sharp-pointed rostrum or 
beak, which is slightly curved downwards, and is move- 
able. 
The eyes are two in number, and may be seen pro- 
jecting from under the anterior edge of the carapace, 
on each side of the base of the rostrum. They are of 
considerable size, and of a brown colour, “ appearing,” 
says Montagu, “ in a strong light, crimson.” They are 
situate upon moveable peduncles, and are formed of a 
transparent cornea, underneath which are a great number 
of small crystalline bodies surrounded with a brownish 
colouring matter. 
The antennae are two pairs, both of them large and 
ramiform, so that they are fitted to serve for swim- 
ming. The first pair are situate immediately below 
the eyes. They consist of a basilar portion, composed 
of two strong joints, from the second of which spring 
an oval ciliated plate, and a slender stalk divided 
into nine or ten articulations, each articulation having 
two or three hairs issuing from its base. The second 
pair spring immediately behind the preceding, and are 
bent so as to be directed at first obliquely forwards, then 
downwards and backwards. The basilar portion consists 
of three stout joints, the last of which sends off a long 
stalk of about ten articulations, considerably longer than 
3 
