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One of these cells, the future egg, grows more rapidly than the others, some or all of which it finally absorbs by means of lobose pseudopodia extruded from its margin.

Further complications arise when the lower walls of the mother zooid become thickened and interpenetrated with solenia, from which buds are developed, so that lobose, tufted, or branched colonies are formed.

The pseudopodia are lobose, sometimes absent, the body then progressing by a flowing movement; the body consists of ectoplasm and endoplasm, the latter being granular and internal, the former hyaline and external.

No mouth; 1 or 2 flagella: amœboid with lobose or ray-like pseudopodia Family Rhizomastigidæ Mouth at base of single flagellum; plastic; no pseudopodia Family Cercomonadidæ One flagellum; inclosed in gelatinous or membranous cups Family Codonœcidæ One flagellum; tentacle like process at base of flagellum; inclosed in cup Family Bikœcidæ One main flagellum and 1 or 2 accessory flagella Family Heteromonadidæ Key to marine genera of Monadida.*

Pseudopodia lobose Genus Mastigamœba   b.