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 Ichthyocrinidse and Comatulse.) 



Page 

 MiLLEEicEiNus Oebignti de Loriol 61 



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



dially disposed. (After de Loriol ; Crinoides de la France, PI. 116, fig. 1.) 



U. Inner aspect of the base ; the space which is empt}- in most species of 



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



Loriol ; ibid., fig. le.) 



MiLLEKIORIN-US POLTDACTYLUS dc 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., PL 110, figs. 



\a, 2a.) 



MiLLEEiCBiNus icAUNExsis de Loriol 61 



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

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

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



MiLLEEicEiNus MiLLEEi d'Orbiguy 61 



4tf. 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., PL 96, fig. 3.) 



Ab. Dorsal asjDect of the cup, showing the small size of the axial canal. (Ibid., 

 Plate %, fig. 2a.) 



MiLLEEiCEixcs Caraboeufi de Loriol 61 



5. Showing iu 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 ; whereas the angles along the sides 

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

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



MiLLEEiCEiNus MUNSTEKiANus d'Orbiguy 62 



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



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



