HOLOTRICHA 703 



Genus Legendrea Faure-Fremiet. Ellipsoid or ovoid; a peripheral 

 zone with small tentacular processes bearing trichocysts. 



L. bellerophon Penard (Fig. 299, m). 100-180/*; fresh water. 



Genus Teuthophrys Chatton and Beauchamp. Body rounded pos- 

 teriorly, anterior end with 3 radially equidistant, spirally curved 

 arms (counter-clockwise when viewed from posterior end); the de- 

 pressions between arms form furrows; cytostome apical, at the inner 

 bases of arms; contractile vacuole terminal; ciliation uniform, ex- 

 cept the inner surfaces of arms where longer cilia as well as tricho- 

 cysts are present; with zoochlorellae; macronucleus rope-shaped 

 and wound; micro nucleus unobserved. One species. 



T. trisula C and B. (Fig. 300, a). 150-300/z long; length: width 

 3 : 1-2:1 ; ponds in Pennsylvania and California (Wenrich, 1929). 



Family 2 Metacystidae Kahl 



Genus Metacystis Cohn. Oblong; ciliation general, except poste- 

 rior end; ciliary circle around cytostome; usually one caudal cilium; 

 with a large posterior vesicle containing turbid fluid. 



M. truncata C. (Fig. 300, 6). Elongate, not much difference in body 

 width at different levels; with about 12 furrow rings; body length up 

 to 30/x; salt water. 



Genus Vasicola Tatem (Pelamphora Lauterborn). Ovoid with 

 caudal cilia; lorica flask-shape, highly ringed; cytostome at anterior 

 end, its lip with 4 rows of long cilia; body surface with shorter cilia; 

 macronucleus round, central, with a micro nucleus; contractile vacu- 

 ole near macronucleus; fresh or salt water. 



V. ciliata T. (Pelamphora butschlii L.) (Fig. 300, c). Body about 

 100m long; sapropelic in fresh water. 



Genus Pelatractus Kahl. Somewhat similar to Vasicola; but with- 

 out lorica or caudal cilia; with a terminal vacuole; without lip of 

 Vasicola; sapropelic. 



P. (Vasicola) grandis (Penard) (Fig. 300, d). Free-swimming; 

 elongated fusiform; numerous contractile vacuoles on one side; body 

 125-220/x long; sapropelic in fresh water. 



Family 3 Didiniidae Poche 



Genus Didinium Stein (Monodinium Fabre-Domergue) . Barrel- 

 shaped; one to several girdles of cilia (pectinellae) ; expansible cyto- 

 stome at the tip of a proboscis, supported by a dense layer of long 

 trichites; macronucleus horseshoe-shaped; two to three and oc- 

 casionally four micronuclei, close to macronucleus; contractile vacu- 

 ole terminal; fresh or salt water. Several species. 



