PROTOMONADINA 353 



Both fresh and salt water fish are hosts to different species of 

 trypanosomes; what effect these parasites exercise upon the host 

 fish is not understood; as a rule, only a few individuals are ob- 

 served in the peripheral blood of the host. Transmission (Robertson, 

 1911); species (Laveran and Mesnil, 1912; Wenyon, 1926; Laird, 

 1951). 



T. granulosumL&ver&n and Mesnil (Fig. 146, e). In the eel, Anguilla 

 vulgaris; 70-80> long. 



T. giganteum Neumann (Fig. 146, d). In Raja oxyrhynchus; 125- 

 130^ long. 



T. remaki Laveran and Mesnil (Fig. 146, /). In Esox lucius, E. 

 reticulatus and probably other species; 24-33/x long. (Kudo, 1921). 



T. percae Brumpt (Fig. 146, g). In Perca fluviatilis; 45-50> long. 



T. danilewskyi Laveran and Mesnil (Fig. 146, h). In carp and 

 goldfish; widely distributed; 40> long. 



T. rajae Laveran and Mesnil (Fig. 146, i). In various species of 

 Raja; 30-35/x long (Kudo, 1923). 



Genus Crithidia Leger. Parasitic in arthropods and other inverte- 

 brates; blepharoplast located between central nucleus and flagellum- 

 bearing end (Fig. 141); undulating membrane not so well developed 

 as in Trypanosoma; it may lose the flagellum and form a leptomonas 

 or rounded leishmania stage which leaves host intestine with faecal 

 matter and becomes the source of infection in other host animals. 



C. euryophthalmi McCulloch (Fig. 147, a-c). In gut of Eury- 

 ophthalmus convivus; California coast. 



C. gerridis Patton (Fig. 147, d). In intestine of water bugs, Gerris 

 and Microvelia; 22-45^ long. Becker (1923) saw this in Gerris re- 

 migis. 



C. hyalommae O'Farrell (Fig. 147, e, /). In body cavity of the 

 cattle tick, Hyalomma aegyptium in Egypt; the flagellate through 

 its invasion of ova is said to be capable of infecting the offspring 

 while it is still in the body of the parent tick. 



Genus Leptomonas Kent. Exclusively parasitic in invertebrates; 

 blepharoplast very close to flagellate end ; without undulating mem- 

 brane (Fig. 141); non-flagellate phase resembles Leishmania. 



L. ctenocephali Fantham (Fig. 147, g, h). In hindgut of the dog 

 flea, Ctenocephalus canis; widely distributed. Morphology (Yama- 

 saki, 1924). 



Genus Phytomonas Donovan. Morphologically similar to Lep- 

 tomonas (Fig. 141); in the latex of plants belonging to the families 

 Euphorbiaceae, Asclepiadaceae, Apocynaceae, Sapotaceae and 

 Utricaceae; transmitted by hemipterous insects; often found in 



