48 SPOLIA ZEYLANICA. 



but only the one figured contained an endogen. In another prepara- 

 tion a free endogen with small granules was seen, but it may have 

 been artificially liberated. 



A trigen, i.e., an encysted larva containing three equally advanced 

 endogens, is shown in fig. 4 ; close by it in the preparation were 

 two monogens, a macrogen with three endogens, and many simple 

 microgens. 



Fig. 3. — Giant monogen in optical section, or macrogen bearing a single 



endogen (E). Only a few of the large granules are indicated. 



The body is somewhat contracted and the rostellum 



is everted. Zeiss. 3 C. cam. luc. Tamblegam. 



Not only are the normal larvae contractile Avithin their cysts, but 

 they retain their contractility after they have become spontaneously 

 gravid. The pentagen shown in fig. 2 Avas very contractile in toto, 

 as also were the several endogens. In the same host a polygen Avith 



