prototype

[Fr., from Latin prototypum, acc us. of prototypus original; Gr. prototypon =a prototype, prop. neut. sing. of pro to typos =according to the first form: protos =first, and typos type single cell, or of a group of cells not differentiated into two or more ti ues; incapable, as a rule, of a imilating nitrogen in its diffusible compounds (ammonia or nitrates, or carbon in the form of carbonates). The food is taken into the protoplasm, either by a specialized mouth or by any part of the cell substance, in the form of particles. Prof. Ray Lankester ( Encyc . Brit . (ed. 9th), xix. 830-66) has brought together the results of the latest investigations on the nature of these minute organisms, and adds full bibliography. He divides them into two grades: 1. GYMNOMYXA, with seven cla es-Proteomyха, Мусе and Radio lari a. tozoa, Lobosa, Labyrinthulidea, Heliozoa, Reticular i a, 2. CORTICATA, with six cla es-Sporozoa, Flag ell at a, Dino flag ell at a, Rhynchoflagellata, Ciliata, and Acinetaria.