DEVELOPMENT OE CIRRIPEDIA. 
153 
mens); dgl, duct of the gl\ leading into the sucker of the antenna; oc, the 
large compound eye in its capsule and the muscles attached to the latter, 
by which its continual vibrating movement is effected ; pi, the abdominal 
feet ; c, the caudal processes. Natural size : — 
Length 1‘30 millim. 
Width 0-70 „ 
Diameter of eye 009 „ 
Diameter of lenses 0-02 „ 
Diameter of sucker (HO „ 
Fig. 25. The Cypris stage, having fastened itself by means of a sucker on the “sail” of 
a dead Velella, in the act of throwing off its Cypris-sheM and feet, of losing 
the compound eyes, and of forming the primordial valves. The end which 
in fig. 24 is the upper one is here the lower, from which the “ plastic” parts 
of the body have retired towards the top. The animal has been taken off 
from the Velella, and the drawing has for the most part been made from a 
Canada-balsam preparation. H. 
I. The young Lepas. 
a. The antennae, with the sucker. 
ped. The pedunculus of the young Lepas. 
o. The mouth. 
p. The newly formed feet (cirri). 
ta l , to 2 , ta z . The primordial valves. 
II. The Bemains of the Cypris which are thrown off. 
pi. The dropping feet of the Cypris stage. 
c. The caudal appendage of the Cypris stage. 
oc. The compound eyes, already dropped and going to be absorbed. 
v. The valves of the shell. 
Natural size : — 
Length of upper portion of the young Lepas 
(not counting the Cypris-'&YieW) . . . .1-0 millim. 
Length of lower portion (formerly the head 
of the Cypris) 0-7 „ 
Height of ta l 07 „ 
Length of ta z 0-2 „ 
Height of ta z 0-8 „ 
Fig. 26. Young Lepas fixed on the sail of a dead Velella (Ve). Low power. H. 
a, antennae, with sucker sticking to the Velella-sail ; ped , pedunculus; ca, 
carina; to 1 , ta 2 , primordial valves. The reticulated structure is here only 
