PLATE XXll. 



Fig. 153. Pterophysa (Bathypliysa) Studeri nov. spec. (Cat. 6). The hypocystic villi in the pneumatophore 



are not sketched; the pneumatophore therefore is shown in its more natural shape. Natural size. 



s, s, s = three siphons. 

 Fig. 154. The second siphon of the same enlarged, to show the short pedicle at its base. 2 X. 

 Fig- I55' -^ hypocystic villus of the same. A median longitudinal section (Cat. 6 glass 3 IV 4), showing 



an outward layer of entodermal cells and a gigantic nucleus interiorly. 120 x. 

 Fig. 156. Rhizophysa Eysenhardti Ggbr. (Cat. 16). Entodermal cells of the apical outer part of a hypocystic 



villus. 200 X. 

 Fig- 157- Pterophysa {Bathypliysa} Studeri nov. spec. (Cat. 6). A transverse section through the gigantic 



nucleus of the cell indicated on Plate XXII, fig. 155 (glass 7 II i). The surrounding entoderm 



layer only partly indicated. 930 :<. 

 Fig. 158. A transverse section of the same somewhat further, also indicated on PL XXII, fig. 155 (glass 7 II 3). 



930 X. 

 Fig. 159. A hypocystic villus of the same enlarged. 25 X. Showing the size of the cell in which the 

 gigantic nucleus is contained, and another transverse wall of a cell in which no nucleus is to 

 be found. 



