HOLOTRICHA 513 



variable; when extended 320-480iu long; salt water. Noland ob- 

 served the organism in a salt spring in Florida. 



Genus Parachaenia Kofoid et Bush. Small; compressed: ven- 

 tral surface slightly concave; dorsal surface greatly convex; cilia 

 long, differentiated into 2 areas, a ventral area consisting of 

 close-set rows and a dorso-lateral area consisting of 7 rows; 

 cytostome circular or slightly oval, at anterior tip; cytopharynx 

 long, narrow; without contractile vacuole. One species. 



P. myae K. et B. (Fig. 235, h). 40-100m long; 7 rows of long 

 cilia on dorso-lateral surfaces, 8 rows of shorter cilia on ventral 

 surface; cytopharynx half body length; in pericardial cavity and 

 siphon of Mija arenaria; San Francisco Bay. 



Family 7 Butschliidae Poche 



This family includes forms which are intestinal parasites of 

 mammals; circular cytostome at anterior end, cytopyge usually 

 located at posterior end; ciliation uniform or in a few zones; 

 with refractile concretion vacuole or vesicle (Fig. 30, d) in anterior 

 portion; one or more contractile vacuoles. 



Genus Butschlia Schuberg. Ovoid, anterior end truncate, pos- 

 terior end rounded; cytostome at anterior end, surrounded by 

 long cilia; thick ectoplasm at anterior end; macronucleus 

 spherical, micronucleus(?) ; concretion vacuole; ciliation uniform; 

 in stomach of cattle. 



B. parva S. (Fig. 236, a). 30-50/^ by 20-30ju. 



Genus Blepharoprosthium Bundle. Pyriform, anterior half 

 contractile, ciliated; caudal cilia; macronucleus reniform; in 

 caecum and colon of horse. 



B. pireum B. (Fig. 236, h). 54-86m by 34-52/x. 



Genus Didesmis Fiorentini. Anterior end neck-like, with large 

 cytostome; anterior and posterior ends ciliated; macronucleus 

 ellipsoid; in caecum and colon of horse. 



D. quadrata F. (Fig. 236, c). 50-90^ by 33-68/x; with a deep 

 dorsal groove. 



Genus Blepharosphaera Bundle. Spherical or ellipsoidal; cilia- 

 tion uniform except posterior region; caudal cilia; in caecum and 

 colon of horse. 



B. intestinalis B. (Fig. 236, d). 38-74/i in diameter. 



Genus Blepharoconus Gassovsky. Oval; small cytostome; cilia 

 on anterior 1/3-1/2; caudal cilia; macronucleus ovoid; 3 con- 

 tractile vacuoles; cytopharynx with rods; in colon of horse. 



