6 ILLINOIS BIOLOGICAL MONOGRAPHS [296 



120/t. The ratio of length protomerite : total length was 1 : 7 and the 

 ratio of width protomerite : width deutomerite was 1 : 2. The spo- 

 ronts are solitary, and characterized by the possession of a short eccen- 

 tric conical projection from the protomerite, which is slightly mobile. 

 The protomerite is constricted conspicuously in a horizontal direction 

 at about its middle portion. The protoplasm above this constriction 

 is sparse and transparent ; below, it is a little more dense and tan ; in 

 the deutomerite it is very dense and black, and the nucleus is not 

 yisible. 



Cysts were found to be ovoidal in shape and measured 320 by 270/x. 

 Spores were not seen. A table of measurements in which all dimen- 

 sions are in microns is given here: 



Length sporont 330 330 270 



Length protomerite 40 50 40 



Length deutomerite : 290 280 230 



Width protomerite 50 60 60 



Width deutomerite 120 120 120 



Eatio 



length protom. : total length 1 -.8.2 1 :6.6 1 :7 



Width protom. : width deutomerite 1 :2.4 1 :2 1 :2 



ECHINOMERA HORRIDA (Leger) Watson 



1899 Echinocephalus horridus Leger 1899 :390-5 



1911 Echinocephalus horridus Sokolow 1911 :281 



1916 Echinomera horrida Watson (This paper) 



Echinomera : Sporonts ovoidal, almost spherical, 100-150/x, in length. 

 Width not given. Protomerite in shape of a narrow elongate blunt 

 cone, the apex eccentric and carrying a papilla which represents a 

 primitive epimerite. Cysts spherical or cylindrical, rounded at ends. 



Taken at Wimereux, France. Host: Lithobius calcaratus Koch. 

 Habitat : Intestine. 



ACUTISPORA MACROCEPHALA Crawley 



[Figure 34] 

 1903 Acutispora macrocephala Crawley 1903a:632-3 



Acutispora : Sporonts solitary, elongate. Maximum length 600/i, 

 wridth not given. Ratio length protomerite : total length : : 1 : 3 ; 

 width protomerite : width deutomerite : : 1 : 1.3. Protomerite one- 



