ECH1N0DERMA1 \. 



Fig. 30. 



55 



Figure of a Starfish (Asterias'rubens). 

 In the ray marked I. the skin has been removed from the upper surface, and 

 the ambulacral ossicles («o) and the suckers (s) are seen in situ : the 

 blind outgrowths (c) from the central stomach (sp) have been dissected 

 out. In II. the gonads (y) are exposed ; and in V. the pouch-like diverti- 

 culum (p) of the stomach is to be seen (where it joins the centra] stomach 

 its roof has been removed to show the folded arrangement of its walls). 

 The anus (a) is seen to be subcentral in position. 



