264 BOPYRIDA. 
young were totally unlike the Cirriped-formed larva of 
the Peltogaster, and that they exactly resembled Rathke’s 
Liriope; thus proving that the body of the supposed 
Peltogaster of Rathke, in which the Liriopes were found, 
was, in fact, the superposed body of the second parasite, 
or, in other words, that the female of Lirtope was now 
' discovered, that Rathke’s animals were the young of that 
female, that Dana’s Cryptothir, found upon a Balanus, 
was either the young or male of a closely-allied animal, 
and that Cavolini’s parasite, found upon Portunus, was to 
be referred to the same group. As the minute and active 
Liriopes were found, both by Rathke and Lilljeborg, 
within the egg-sac of the parasitic female, the question 
arises (and is still undetermined) whether these little 
creatures are exclusively young males, or are the larve- 
form of both sexes? and whether the adult male does or 
does not retain its larva shape almost unaltered during 
the whole of its life? Analogy with the stages of de- 
velopment of the Bopyride, and especially with those of 
the following species, would lead us to adopt the opinion 
that in their earliest stages both sexes of ‘this genus 
are alike in form, and that whilst the female gradually 
loses the articulated character, together with all the 
external appendages of the body, the male retains much 
of its larva condition. Such is the opinion of Lilljeborg, 
who has argued the question at considerable length, and 
such appears probable on taking into consideration the 
comparative characters of the young and adult males of 
Bopyrus squillarum (as represented in our figures in p. 218), 
of Gyge galathee (p. 225), and of Jone thoracica (p. 254), 
and those exhibited in our several figures of the young 
or males of this species, given by Rathke and Lilljeborg 
copied as above, and our own as given in the cut at the 
head of this article. According to Lilljeborg, however, 
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