AMAROUCIUM ARGUS. 



FIG. 93. Isolated individual of Amarou- 

 cium argus. Much enlarged. (M. 

 Edwards, pi. iii, f. 1.) 



A , thorax. 



B, superior abdomen. 



C, post-abdomen. 



a, proper tunic. 



b, thoracic tunic. 



b', longitudinal muscular fibres of inner 

 tunic. 



c, branchial aperture. 



d, branchial collar, below which are two 



eye-like spots. 



e, branchial sac. 

 /, thoracic sinus. 



/', transverse vessels of branchial sac. 

 h, cloaca. 

 i, anus. 

 i', languet. 

 j, nerve-ganglion. 

 /,-, oesophagus. 

 I, stomach. 

 in, intestine. 

 n, orifice of intestine. 

 o, heart, 

 o', pericardium. 

 p, ovary. 



p', ova ready to pass into cloaca. 

 p", ova in cloaca ready to hatch. 

 (j, testicle. 

 r, vas deferens. 

 v' , orifice of vas deferens. 



