HDLOTHIJHOI F)K A 



-ten. 



amp. 0^y^^^ 



651 



■ In.m. 



F\ii. 456. A view of Holothuria tuhulosa, somewhat diminished. The animal 

 is opened along the left dorsal interradius and the viscera are exposed. After 

 Ludwig. al. alimentary canal; amp. ampullae of tentacles; d. cloaca; ^. re- 

 productive organ ; In.m. radial longitudinal muscle partly cut away ; plx. dorsal 

 "blood plexus"; Po. Polian vesicle; ra.zvv. radial water vessel; v.b. ventral 

 "blood vessel"; re. respiratory trees; stc. stone canals; ten. tentacles; wvr. 

 water vascular ring. 



