PLATE XIX. 



Astrocrinus Benniei, Eth. Jn., sp., p. 301. 



Page 



Fig. 1. Summit view, showing the modified ambulacrum, and opposite to it the irregular 



interradius. Carboniferous Limestone, Scotland. x 10 122 



Eleutherocrinus Cassedayi, Shumard S$ Yandell. 



Fig. 2. Cross section of half the calyx near its lower end, showing three of the ambulacra, 

 with the perforated lancet-plate and side plates in situ. Lower Devonian, Ken- 

 tucky. Coll. Wachsmuth. x 6 96 



Fig. 3. Another section, taken nearer the summit, with four groups of hydrospires. Coll. 



Wachsmuth. x 6 96 



Fig. 4. Radial view of an incomplete calyx, showing a radial sinus with half the ambu- 

 lacrum in situ, and two deltoid plates visible. Coll. Wachsmuth. x 2. . . 25 



Fig. 5. View of the azygos radius in the same specimen, showing the large modified radial 



and one basal plate below it. x 2 26 



Fig. 6. Summit view of the same specimen, showing the four regular ambulacra and the 



modified azygos one, &c. x 4 26 



Eljeacrintjs Verneuili, Troost, sp., p. 216. 

 Fig. 7. Cross section of the calyx from above, showing the branches of the water-vascular 

 ring, the space leading from the spiracles to the groups of hydrospires, and the 

 anus. Corniferous Limestone, Kentucky. Coll. Wachsmuth. x 4 ... 215 



Stephanocrinus angulatus, Conrad. 



Fig. 8. Summit view of an individual in which the interradial processes and the ambu- 

 lacral plates of three sinuses have been removed ; the radio-deltoid sutures, the 

 anus, and the paired interradial openings are visible. Niagara Group, North 

 America. Coll. W. H. Barris. x 4 34 



Fig. 9. Another specimen with the interradial processes more or less preserved ; the 

 ambulacral plates, with the covering plates of the mouth, which are here in the 

 position of true orals, and also the anal plates, are intact. Niagara Group, New 

 York State. x 4 73 



Fig. 10. Another specimen, similar to Fig. 8, but with better preserved ambulacra. x 4. 26 



Fig. 11. Radial view of a calyx, with one of the interradial processes partly preserved. The 



external ridges and ornaments are well shown. x3 17 



Fig. 12. An interradial and partly oblique view of a portion of the summit of the same 

 specimen, to show the radio-deltoid sutures crossing the interradial processes, and 

 the apertures on the latter. x 4 26 



Triccelocrinus Woodmani, M. fy W.? 



Fig. 13. Interradial view of a well-preserved specimen, exhibiting the excavated base and 



the deeply sunken ambulacra. Subcarboniferous ; locality unknown. Coll. 



Museum d'Histoire Naturelle, Paris. xl| 18 



Fig. 14. Base of tbc same specimen, showing the three excavations in the direction of the 



interbasal sutures. x H 16 



Fig. 15. Summit view of the same, showing the position of the deltoid plates, spiracles, and 



anus. X 1^ 112 



Fig. 16. The anus and its accompanying spiracles, with portions of two ambulacra. x 3. . 112 



