Plate XIV. 



Abatus cavernosus Phil. 



P. 20, 25, 46, 74. 



Fig. 163. A young specimen, measuring 2,3 inm., taken out of oiie of tlie deepened petalii by the late Pro- 

 fessor Peteks of Berlin. It is jejuiie, astomous, aproctic. Ventral view. 



Fig. 164. The same, dorsal view. 



Fig. 164, A. Tbe calycinal region. 



Fig. 165. The buocal membrane, entire, unpierced, the oesophageal and of the alimentary canal with ils lunuii 

 appeariiig on its inside. To be compared with the woodcut p. 26, representing the same parts 

 in a specimen a little more advanced, in which the oesophageal opening has pierced the buccal 

 membrane centrally. 



Fig. 166. The calycinal region from the inside, showing the blind excretory extremity of the iutostine touching 

 the closed membrane centrally. 



Fig. 167. The peristomal region from the inside, showing the blind oesophagus restiiig ngainst the Iniccal 

 membrane. 



Fig. 168. The blind excretory end of the intestine, suspended to the peritoneal lining. 



Fig. 169. A spherid, optical section. 



Fig. 170. A tubercle. 



Fig. 171. A spine with the larval envelope. 



