PROTOMONADIDA 147 



Genus Cryptobia Leidy (=Trypanoplasma Laveran and 

 Mesnil). Parasitic in the reproductive organs of molluscs and 

 other invertebrates and in blood and intestines of fish. 



Cryptobia helicis Leidy (Fig. 53, e). In the reproductive 

 organs of various species of Helix of America and Europe. 

 Length 6 to 20 microns. Asexual reproduction through binary 

 fission is known. 



Cryptobia borreli (Laveran and Mesnil) (Fig. 53, /). In 

 the blood of various freshwater fish such as Catostomus, Cy- 

 prinus, etc. Body 20 to 25 microns long. 



Cryptobia cyprini (Plehn) (Fig. 53, g, h). In the blood of 

 carp and goldfish. Comparatively rare. Body 10 to 30 microns 

 long. 



Cryptobia grobbeni (Keysselitz). In the gastrovascular cavi- 

 ty of Siphonophora. Size about 65 microns by 4 microns. 



Family 6 Amphimonadidae Kent 



Body naked or with a gelatinous envelope. With two equally 

 long anterior flagella. Often colonial. Free-swimming or at- 

 tached. One or two contractile vacuoles. Mainly fresh water. 



Genus Amphimonas Dujardin. Small oval or rounded amoe- 

 boid form. Flagella at anterior end. Free-swimming or attached 

 by an elongated stalk-like posterior process. Fresh or salt water. 



Amphimonas globosa Kent (Fig. 54, a). Diameter of body 

 about 23 microns. Fresh water. 



Genus Spongomonas Stein. Individuals in granulated gela- 

 tinous masses. Colony reaches often several centimeters in 

 height. In motile stage pointed pseudopodia are produced. 

 Fresh water. 



Spongomonas uvella Stein (Fig. 54, b). Body about 2X mi- 

 crons long. Colony about 50 microns high. Fresh water. 



Genus Cladomonas Stein. Individuals are embedded in 

 dichotomous dendritic gelatinous tubes which are united later- 

 ally. Fresh water. 



Cladomonas fruticulosa Stein (Fig. 54, c). Body about 8 

 microns long. The whole colony reaches 85 microns in height. 



Genus Rhipidodendron Stein. Similar to Cladomonas, but 

 the tubes are fused lengthwise. Fresh water. 



Rhipidodendron splendidum Stein (Fig. 54, d, e). Body 



