102 MARINE ANIMALS OF MASSACHUSETTS BAY. 



one is pierced by a small hole througli wliicli the eggs are 

 passed out, while in the five smaller plates are the eye-specks. 

 The ovaries themselves consist of long pouches or sacs, carried 

 along the inner side of each ambulacrum ; one of these ovarian 

 plates is larger than the others, and forms the madreporic body. 



Fig. 131. 



being pierced witli many minute holes ; liere, as in the titar-fish, 

 it is placed between two of the ambulacral rows, and opposite the 

 fifth or odd one. Looked at from the under or the oral side, as 

 seen in Pig. 134, the animal presents the mouth, a^jircular aper- 

 ture furnished with five teeth in its centre ; these five teeth open- 



Fi^. 131. Toxopneustes from abore, with all the appendages expanded ; natural size. 



