THE SPOROZOA 



'75 



withered remains of the host-cell, and the Gregarine body, com- 

 posed of protomerite and deutomerite, is free in the gut, where 

 it continues its growth and further development. The free 

 Gregarines are commonly termed sporonts. 



The epimerites of Gregarines show every variety of size, shape, and 

 pattern, and may be ornamented with hooks, spines, and other appendages 

 (Fig. 17). They function as organs of attachment, as has heen said, and 

 probably also as organs of nutrition, since Laveran and Mesnil [16] have 



Fio. 17. 



Epimerites of various Gregarines. a, Gregarina longa (Leger), (par. Tipula sp., larva) ; 6, Sycia 

 inopinata, Leger (par. Audouinia sp.) ; c, Pileocephalus heerii (Roll.), (par. Fhryganea, larva) ; 

 d, Stylorhynchus longicollis, Stein (par. Blaps mortisagd) ; e, Bdoides firmus (Leger), (par. Der- 

 inestes lardarius, larva) ; /, Cometoides crinitus (L^ger), (par. Hydrobius sp., larva) ; g, Geneio- 

 rhynchus monnieri, A. Schn. (par. Libellula, larva) ; h, Echinomera hispida (A. Schn.), (par. 

 Lithobius forficatus) ; i, Pterocephalus nobilis, A. Schn. (par. Scolopendra spp.). (From 

 Wasielewski, after Leger.) 



shown that they evoke changes in the host-cell which cannot be explained 

 as the result simply of mechanical irritation. The possession of an 

 epimerite is a feature which is used for classifying the Gregarines, and 

 the legion Eugregarinae is separated into the two sub-orders Cephalina and 

 Acephalina, according to the presence or absence of this appendage. Aa 

 a general rule the forms which possess an epimerite have the body 

 behind it divided into protomerite and deutomerite by a septum, and 

 have hence been termed Polycystida seu Septata (Lank.), while those 

 without an epimerite are also without a septum ; hence Monocystida 

 seu Haplocyta (Lank.). But in one family, Doliocystidae, Labbe, an 

 epimerite is present, and may attain a considerable size, as in Doliocystis 

 (Monocystis) aphroditae (E. R L.), without any septum dividing the rest of 



