94 
pointed or flattened into a dise (Plate I., fig. 4). This is 
the ‘‘chalimus”’ stage referred to on previous pages, so 
called because Burmeister, in 1831,* described it as a new 
oe 
genus under the name ‘ Chalimus.” This was afterwards 
shown by Hesse and others to be only a young stage of the 
Caligide. The young parasite continues to grow by suc- 
cessive moultings, and the various appendages make their 
appearance in regular order. The duration of this 
attached stage has not been determined. When the 
appendages are fully developed, as in Plate I., fig. 6, the 
filament separates at its junction with the frontal margin 
leaving a notch, the remains of which persist all through 
the adult life. 
The male, at the conclusion of the attached stage, is 
practically fully developed. The female remains in an 
immature condition until fertilisation is effected and the 
ova begin to pass down the oviducts. The genital seg- 
ment then increases in size from that shown on Plate IT., 
fig. 6, to the mature condition of Plate I., fig. 1. 
* Nov. Act. Acad. Natur. Cur. Bonn., vol. xvii., p. 294. 
