PLATE VI. 



(Figs. 1 to 12 are represented to show the orientation of the stem and axial 

 canal among Xeozoic Crinoids ; figs. 13 to 20 the close affinities between 

 the Ichthyocrinidce and Comatulse.) 



Page 

 Millericrinus Orbignyi de Loriol Gl 



Fig. la. The crown with a portion of the stem ; the angles of the latter interra- 



clially disposed. (After de Loriol ; Crinoifdes de la France, PI. 116, fig. 1.) 



lb. Inner aspect of the base ; the space which is empty in most species of 



Millericrinus occupied in this specimen by small infrabasals. (After de 



Loriol ; ibid., fig. lc.) 



Millericrinus polydactylus de Loriol 61 



2a. The infrabasals attached to the truncated upper end of the stem (lateral 



view). 

 2b. Ventral aspect of the same. (Both after de Loriol; ibid., PI. 110, figs. 



la, 2a.) 



Millericrinus icaunensis de Loriol 61 



3. The dorsal cup with the proximal joint of the stem attached; the angles of 

 the latter corresponding with the angles of the basals ; the axial canal 

 quite small. (After de Loriol ; ibid., PL 61, fig. 5d.) 



Millericrinus Milleri d'Orbigny 61 



4a. Ventral aspect of the dorsal cup ; the diameter of the open space between 

 the basals almost as great as that of the whole stem. (After de Loriol ; 

 ibid., PI. 96, fig. 3.) 



ib. Dorsal aspect of the cup, showing the small size of the axial canal. (Ibid., 

 Plate 96, fig. 2a.) 



Millericrinus Caraboeufi de Loriol 



5. Showing in a side view the angularities upon the proximal face of the top 



stem joint. Being radially disposed, they conform to the depressions 

 upon the outer face of the basal disk ; w r hereas the angles along the sides 

 of the stem are directed interradially, in accordance with the rule govern- 

 ing dicyclic Crinoids. (Ibid., PI. 59, fig. 3c.) 



Millericrinus munsterianus d'Orbigny 62 



6. Top stem joint, showing the angular ridges upon the upper surface. (After 



de Loriol ; ibid., PI. 83, fig. 2.) 



