979 BOPYRID#. 
head and four anterior segments and legs of the body 
still distinct. In the next stage the great terminal mass, 
forming seven rounded lobes, is much increased in size, 
the fourth segment of the body has become absorbed,* 
and a large membranous dilatation also appears on the 
underside of the general mass. In the final stage all 
distinct traces of the head and three anterior segments 
appear to be lost, and the animal reduced to the inert 
mass represented in the right-hand figure of the wood- 
cut at the head of this article. According to Buchholz, 
however, the full-grown female still retains the antennz 
and fore pair of legs, although immersed in the fore 
portion of the sac-like envelope of the rest of the 
body (see his fig. 4 in pl. xvii. ‘f Vorderkorper eines 
erwachsenen individuums von dem Sacke abgetrennt”’). 
It is from this circumstance, as well as from a considera- 
tion of the character and number of the legs and 
branchial appendages of the immature state that Dy. 
Buchholz was led to separate this animal from Liriope as 
described by Lilljeborg, under the name of Hemioniscus. 
Until, however, the males of both species are positively 
determined, we consider it more advisable to retain them 
both in one genus. 
* The animal in this state exhibits a striking analogy to the adult gravid 
female of the Chigoe (Pulex penetrans). 
