272 BOPYRnm 



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 antennas 

 and fore pair of legs, although immersed in the fore 

 portion of the sac-tike envelope of the rest of the 

 body (see his fig. 4 in pi. xvii. " Vorderkorper ernes 

 erwachsenen inclividuums 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 Dr. 

 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). 



