AMERICAN SILURIAN CRINOIDS 
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Platycrinidae gen. and sp. indet. No. 2 51 
Fig. 25. Calyx, with large interambulacral plates in position. X 3/2. 
Laurel limestone; St. Paul, Indiana. 
Platycrinidae gen. and sp. indet. No. 3 52 
Figs. 26, 27, 28, 29. Lateral, dorsal and ventral views of small species from St. Paul, Indiana. 
Hapalocrinus gracilis new species 52 
Fig. 30. Complete crown, with heavy cuneate arms and strong pinnules. X 2. 
31. Another specimen with part of arms and stem, showing high interambulacral tegmen 
plates. X 2. 
32. Small specimen with arms intact. X 3/2. 
Beech River formation ; Decatur County, Tennessee. 
