180 The Mastigophora 



plasma. Species of Cryptobia occur in the seminal vesicles and digestive 

 tract of molluscs and certain other invertebrates, and in the digestive 

 tract of marine fish. Species of Trypanoplasma occur in the blood of 

 marine and fresh-water fishes. 



Family 5. Amphimonadidae. These are naked or loricate types with 

 two equal flagella (181). Naked types may be either free-swimming or 

 sessile. Colonial forms are assigned to several genera. The group as a 

 whole is much in need of investigation. 



Solitary types include Amphimonas Dujardin (245; Fig. 4. 42, B, D), Diplomita Kent 

 (Fig. 4. 42, D), Spiromonas Perty (181), and Streptomonas Klebs (Fig. 4. 42, F, G). 

 Colonial types are assigned to Cladotnonas Stein (Fig. 1. 3, F), Rhipidodendron Stein 

 (181) and Spongomonas Stein (Fig. 4. 42, I). 



Family 6. Bodonidae. These are solitary naked flagellates reported from 

 fresh and salt water, and from the digestive tract of certain reptiles and 

 Amphibia. One of the two flagella is usually trailed in swimming. A para- 

 basal apparatus is known in several genera. The Feulgen-positive para- 

 basal body of Bodo divides in fission (110) and is thus similar to the 

 kinetoplast of Trypanosomidae. 



The following genera are included: Bodo (Ehrbg.) Stein {Proiuazekia Hartmann and 

 Chagas) (110; Fig. 4. 42, E); Cercobodo Krassiltschick (109, 110; Fig. 1. 10, P); Cerco- 

 monas Dujardin (113, 282); Colponema Stein (151; Fig. 4. 42, K); Dinomonas Kent 

 (130; Fig. 4. 42, M); Phyllomitus Stein (110; Fig. 4. 42, N); Pleuromonas Perty (181; 

 Fig. 4. 42, H); Proteromonas Kunstler {Prowazekella Alexeieff) (98; Fig. 4. 42, J), from 

 the intestine of lizards and salamanders; Pseudobodo Hollande (110; Fig. 4. 42, L). 



Order 3. Polymastigida 



Erection of the Order Trichomonadida by Kirby (147) has re- 

 moved from the old Order Polymastigida several families of closely 

 related uninucleate and multinucleate flagellates. As retained here, the 

 Polymastigida include families which are excluded from the Trichomo- 

 nadida but form an otherwise heterogeneous group. This arrangement 

 will serve a practical purpose until accumulated data permit a more 

 satisfactory classification. In this restricted sense, the Polymastigida 

 usually have 3-8 flagella and one, two, or occasionally a number {Micro- 

 rhopalodina) of nuclei. A parabasal apparatus is known in the Hexa- 

 mitidae but its homology with that of the Trichomonadida is not yet 

 certain. Seven families are retained in the order: Trimastigidae, Tetra- 

 mitidae, Streblomastigidae, Retortomonadidae, Callimastigidae, Poly- 

 mastigidae, and Pyrsonymphidae. 



Family 1. Trimastigidae. There are three flagella, one anterior and 

 two trailing (181). Almost nothing is known about the cytology of the 

 group. One genus has been reported from salt water and two others 

 from fresh water. The family includes Dallingeria Kent and Trimastix 



