FORMS OF CELLS. 



drawn out into attenuated filaments and may be hundreds of 

 times longer than their width. Cells which are considerably 

 elongated are often called fibres ; thus we speak of muscle- tibres, 



FIG. 34. A few examples of the infinite variety of cell-shapes, etc. a, epidermal cell of 

 Callitriche ; b, stellate cell of the flowering rush, Butomus ; c, branched bast-cell of the 

 larch ; rf, stellate hair-cell of Deutzia ; e, stellate cell of the yellow water-lily, Xuphar ; 

 f, part of a branching laticiferous cell of Euphorbia ; g, a one-celled plant, Cosmarium; 

 h, a one-celled plant, Micrasterias ; /, a one-celled plant Staurastrum ; j, a cartilage-cell 

 from the human metatarsal bone ; k, the outer cell-wall of a pollen grain of Thunbergia 

 normally wound about the (spherical) grain, but now unrolled by reagents ; I, another 

 form of Micrasterias : m, diagram of an infusorian animal, Vorticella ; , nerve-cell 

 from the spinal cord of a calf ; o, germ-cell (spermatozoidt of a stonewort, Xitella ; p, 

 a one-celled plant or microbe, Sjiirillum. (Compiled from various sources, and not 

 equally magnified.) 



