446 The Stomodceum^ Mesenterial Filaments. $?,., o/Xeuia. 



FIG. 3. Endoderm cells from coelentera of poljps, showing the ordinary endc~ 

 derm cells (E) and the cells bearing pseudopodia (P). x 400. E, endoderm 

 cell with racuolated protoplasm ; ME, muscle process of endoderm cell cut 

 transversely ; N, nucleus ; P, pseudopodia of endoderm cells. 



cubical or columnar, and contain many small vacuoles which give the 

 protoplasm a reticulate appearance (E, fig. 3). Among the ordinary 

 endoderm cells there are numerous cells, the inner or free end of which 

 is produced into a long pseudopodium (P) which is from four to eight 

 times as long as the basal portion of the cell. This pseudopodium 

 may be slender or moderately stout, and may attain a length of over 

 0*12 mm. The basal part of the cell from which the pseudopodium 

 arises has the reticulate protoplasm of an ordinary endoderm cell, and 

 the nucleus of the cell is situated in this portion. The pseudopodium 

 is not vacuolated ; its protoplasm exhibits a homogeneous or very 

 finely granular structure. The pseudopodia usually taper towards 

 their free end, but in a few instances this end is slightly broadened 

 and flattened. In one case the pseudopodium, which is a very large 

 one, bears a short branch near the middle of its length. The pseudo- 

 podia appear to be flexible, as in several cases they are curved so that 

 their tips approach the basal portion of the cells. These curious 

 pseudopodia-bearing cells are very numerous, and are found in all 

 parts of the endoderm lining the coelentera and the cavities of the 

 tentacles. 



