BOPYRID. 213 
Bopyriens and Joniens, established upon the foliaceous or 
filiform structure of the appendages of the tail, cannot 
be maintained, as several genera have been lately dis- 
covered which are truly Bopyrideous, although furnished 
with filiform and even clavate caudal appendages. The 
genera Prosthetes and Athelges, parasites on the tails of 
hermit crabs (Paguri), are, in respect to the peculiar 
formation of their pleonic appendages, amongst the most 
remarkable of crustaceous animals. In Jone, these organs 
are singularly branched, resembling pieces of coral, and 
the incubatory plates are furnished with long clavate 
appendages. We have added the anomalous parasitic 
genus Liriope to this family (rather than place it near 
Tanais, as done by Dana), from a consideration: of its 
general character. The entire want of limbs in the 
female, and the somewhat indistinctly articulated body 
of the males, with the pleon destitute of lateral terminal 
appendages, are very characteristic distinctions, separating 
it from the majority of the family, but, at the same 
time, removing it still farther from the Tunaides. The 
genus Cryptothir of Dana appears to us to be founded 
upon a carelessly examined male of a species of Liriope, 
as may be at once perceived by comparing Dana’s figure 
of Crypt. minutum with our figure of Liriope pygmea. 
The family, at first, comprised only the genus Bopyrus, 
a separate family having been proposed for Jone, but 
more recent observations have fully proved, as stated above, 
not only that the two animals are closely united together 
by the intervention of several genera discovered since the 
publication of M. Milne Edwards’s general work on the 
Crustacea, such as Kepon, Phryxus, and Athelges, &c., but 
that the genera Gyge of Cornalia and Panceri, Dajus of 
Kroyer, Ledya of Cornalia, and Argeia of Dana must be 
added to the family. 
