86 ILLINOIS BIOLOGICAL MONOGRAPHS [296 



120ju,. 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 

 visible. 



Cysts were found to be ovoidal in shape and measured 320 by 270)U.. 

 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 



Ratio 



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 Echinomcra horrida Watson (This paper) 



Echinomera : Sporonts ovoidal, almost spherical, 100-150|U, 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: Lithohius calcaratus Koch. 

 Habitat : Intestine. 



ACUTISPORA MACROCEPHALA Crawley 



[Figure 34] 



1903 Acutispora macrocephala Crawley 1903a :632-3 



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

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

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



