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Rhizoceinus Rawsoni Pourtales 63 



Fig. la. Dorsal aspect of the cup ; the vacant space between the basals of different 

 form, and larger than the axial canal of the stem. (After P. H. Carpenter ; 

 Challenger Pep. on Stalk. Crin., PL X., fig. 5.) 

 lb. Distal face of a stem joint. {Ibid., fig. 14.) 



Pentacbinus astebias W. Thomson . 



8. Dorsal aspect of the cup ; the empty space within the basal ring interradially 



disposed. (Carpenter, ibid., PI. XII., fig. 16.) 



Metaceinus astgulatus P. H. Carpenter 65 



9. The space within the basal ring, contrary to preceding figure, radially dis- 



posed. (After Carpenter ; ibid., fig. 2.) 



Bathyceinus aldbichianus P. H. Caepenteb 65 



10. Horizontal section of the basal ring. (After Carpenter; ibid., PI. VIK. 



fig. 2.) 



11. The infrabasals of Onychoceinus, coalesced with the top stem joint. (Coll. 



W. and Sp.) 65 



12. Dorsal aspect of the Base of Glyptoceinus deoadaotylus ; the interradial 



outline of the upper stem joint taking its form from the basal concavity. 

 (Same collection.) 66 



13. 14, and 15. Pentacrinoid larvae of Antedon. (After P. H. Carpenter ; Chall. 



Eep. on the Comatulce, PI. XIV.) 152 



16. A young Taxoceinus from the Burlington Limestone. (Coll. W. and Sp.) 152 



17. A young OmrciiocBDJUs from the Keokuk Group. (Same collection. J , . 152 



Antedost Rosacea Lamarck 152 



18. In its young stage ; the centro-dorsal and succeeding stem joints interradi- 



ally disposed, the primary cirri radially. (After W. B. Carpenter ; Philos. 

 Trans. 1866, PL XLI.) 



19. In its adult state. (Ibid., PL XXXVIII.) 



Onychoceinus Uleichi S. A. Miller 152 



20. In its general structure resembling a young Antedon. 



(Figs. 2b, 4a, la, 8, 9, 10, 11, 12, 18, are drawn with the interradial side up ; 

 Figs, lb, 3, lb, 6, 19, 20 with the radial side up.) 



