294 



COMPAEA TI VE ANA TOM Y 



CHAP. 



Fiti. -236. Schizaster lacu- 

 nosus ? from the apical side 

 (original). The spines, and the 

 protuberances on which they 

 stand, are not depicted. 1, Tin- 

 anterior unpaired ambulacrum ; 

 2, the right anterior ambulacrum ; 

 3, fasciole ; 4, the right posterior 

 interainlmlacrnm ; 5, the right 

 posterior ambulacrum ; 6, the 

 unpaired posterior interambula- 

 crum ; 7, anal region. 



Fni. ^37. Palaeopneustes 

 Murray! (after Agassiz). 

 from the oral side. 1, The 

 anterior ambulacrum ; 2, 3. 

 the anterior right and the 

 posterior right ambulacra ; 

 4, peristome ; 5, anal region. 



