PLATE VII. 



Malocystites Murchisoni (page 66). 



Figure la. Right side of a specimen, shewing the ambulacral orifice and the eight arms. 



" lb. The left side, shewing the position of the mouth, m. 



" Ic. Vertical view of the ambulacral orifice. 



" Id, le. Left sides of two other specimens. 



" If. Apex of le. 



" lA. Base of Id, shewing the three basal plates. 



" li. Portion of an upper surface of an arm magnified. 



Malocystites Barrandi (page 67). 



Figure 2a. View of the left side of a specimen ; a, the arm. 

 " 2b. Posterior view of the same. 

 " 2c. Anterior view of another specimen. 



" 2d. The arm of 2a magnified, shewing the short branches of the ambulacral 

 furrow to the bases of the pinnulae. 



