THE HAEMOFLAGELLATES 249 



The other, the anterior flagellum, may or may not persist. At 

 least three genera known so far. 



Genus Trypanoplasma, Laveran and Mesnil. The anterior 

 flagellum is present. 



Type-species, T. borreli, Lav. and Mesn. (Fig. 11). Length of body 

 20-22 /x, of free flagella 13-15 /A, breadth 3J-4J p. Parasitic in Leuciscus 

 erythrophthalmus, rudd, and Phoxinus laevis, minnow. Other species are T. 

 cyprini, from the carp, and T. varium, a rather larger form, from the loach. 



Genus Trypanopkis, Keysselitz. The anterior flagellum is pre- 

 sent. The free part of the posterior flagellum is short, and the 

 undulating membrane is straight and relatively narrow. The 

 species for which this genus was founded is parasitic in certain 

 Siphonophores, and almost certainly not a haemal form. 



Fiu. 30. 



Trypanophis grobbeni (Poche). e.c, ectoplasmic cap ; e.l, delicate ectoplaamic layer, thin- 

 ning out posteriorly ; i, inclusions in the cytoplasm ; x, nuclear body of uncertain origin and 

 significance. (After Keysselitz.) 



Type-species, T. grobbeni (Poche). Average length 60-65 p, width 

 about 4 /x. From Cucubalus kochii, Halistemma tergestinum, Monophyes 

 gracilis, Gulf of Trieste. Apparently the same parasite has also been 

 observed in Abyla pentagona, Gulf of Naples. The organisms are to be 

 found in all the ramifications of the coelenteron, from the digestive-cavity 

 of the gastrozoids to the radial canals of the medusoid buds. Nothing 

 is known with regard to the transmission from one Siphonophoran colony 

 to another. 



Great interest attaches to certain Trypanoplpsmatine parasites 

 recently described from the alimentary canal of fishes. In their 

 general morphology and the possession of an undulating membrane 

 they agree closely with Trypanoplasma, and their describers have 

 included them in this genus, as T. intestinalis, L6ger, and T. ven- 



