no HANDBOOK OF PROTOZOOLOGY 



defined chromatophores parietal; with pyrenoids. Sexual and 

 asexual reproduction. 



Brachiomonas siihmarina Bohlin (Fig. 37, j). Body 15 to 

 24 microns long. Fresh water. 



Genus Lobomonas Dangeard. Ovoid or angular with a 

 thick wall and a number of processes. Chromatophores cup- 

 shaped; one pyrenoid. Asexual and sexual reproduction. 



Lobomonas pentagonia Hazen (Fig. 37, k). About 20 microns 

 long. In fresh or brackish water. 



Genus Chlorogonium Ehrenberg. Fusiform. Membrane 

 thin and adheres closely to the protoplasmic body. Plate-like 

 chromatophores usually present, sometimes ill-contoured. Four 

 pyrenoids. Numerous scattered contractile vacuoles. A stigma; 

 a central nucleus. Asexual reproduction by two successive 

 transverse fissions during motile phase. Anisogamy reported. 



Chlorogonium euchlorum Ehrenberg (Fig. 37, /). Length up 

 to 50 microns. In stagnant water. 



Genus Carteria Diesing. With the characteristics of 

 Chlamydomonas, but with four fiagella. Fresh water. 



Carteria cordiformis (Carter) (Fig. 37, m). Body somewhat 

 heart-shaped, length 10 to 20 microns. 



Family 3 Volvocidae Ehrenberg 



An interesting group of colonial flagellates. The individual 

 is similar on the whole to that of Chlamydomonadidae, with 

 two equally long fiagella (four in Spondylomorum), green 

 chromatophores, pyrenoids, stigma, and contractile vacuoles. 

 The body is covered by a cellulose membrane and not plastic. 

 The colony or coenobium is discoid or spherical. Exclusively 

 freshwater inhabitants. 



Genus Gonium Miiller. Four or sixteen individuals arranged 

 in one plane. Each cell ovoid or slightly polygonal, possesses 

 two fiagella which are arranged in the plane of the coenobium, 

 and may or may not be covered by a gelatinous envelope. 

 Protoplasmic connections among individuals occur frequently. 

 Asexual reproduction through simultaneous divisions of the 

 component cells. Sexual reproduction is isogamy and the zy- 

 gotes are reddish in color. 



Gonium sociale (Dujardin) (Fig. 38, a, b). Four individuals. 



