248 



PROFESSOR OSKAR CARLGREN ON THE GENUS PORPONIA 



FIG. 2. 



FIG. 3. 



Fics. 'J and 3. Schematic sections through the oesophagus region of Purpunia anlardim (fig. 2) and 

 Iliilrnriiix I'lii-li/ri'iii (lig. 3). The position of the tentacles (the dark rings) is drawn in. The rect- 

 angular, dark figures on the mesenteries indicate the longitudinal muscles. The shaded lines denote 

 the directive plane. In Po/ponia the ridges of the oesophagus are not drawn in. 



(ROY. sue. KIUN. 'CHANS., VIM,. L., 56.) 



