PLATE II. 



Hybocrinus tumidus (page 28). 



Figure la. "View of the anterior side of a specimen, shewing the azygos plates. 

 " lb-Id. Different views of other specimens. 



« le. A polished transverse section just below the base of the arms, shewing 

 the channels in the primary radial plates for the ambulacral orifices. 



Hybocrinus conicus (page 29). 



Figure 2a. Right side of a specimen of the average size. 

 " 26. Left side of another specimen. 



Carabocrinus radiatus (page 31). 



Figure 3a. View of the anterior side, shewing the azygos inter-radius. 

 " 36. Base of the same specimen. 

 " 3c. Posterior side of a different specimen. 

 " 3d. Ventral surface of a small individual. In the centre of the lower side 



of the figure is the mouth, and directly above it the small anal 



aperture. 

 " 3e. Ventral surface of a larger specimen, shewing obscurely the five 



ambulacral grooves. The three round darkly-shaded spots appear 



to be apertures accidentally produced. 



Carabocrinus Vancortlandti (page 32). 



Figure 4 represents the posterior side of the specimen. 



PoROCRiNUS CONICUS (page 34). 



Figures 5a, 56. Posterior views of two specimens. 



" 5c, Anterior side of a specimen, enlarged to shew the azygos plates and 



poriferous areas. 

 " 5d. Ventral surface of 5a. 



