2 



Pentremites pyriformis, Say, var. symmetricus, Hall, var. ; p. 167. 



Page 

 Fig. 24. Radial view for comparison with figs. 25-30. Subcarbouiferous, North America. 



Coll. P. H. Carpenter. Natural size 168 



Pentremites pyriformis, Say, p. 167. 



Figs. 25-30. Radial views of six different forms referred to this species, which show great 

 variability in the length and breadth of the calyx. Subcarbonifcrous, North 

 America. Natural size 168 



Pentremites sulcatus, Roemer, p. 165. 

 Fig. 31. Transverse section of an ambulacral field, showing the lancet-plate in position, and 

 the two groups of hydrospire-folds which are reduced in number and enclosed 

 within a cavity formed by the inward growth and thickening of contiguous 

 radial plates. Subcarbonifcrous, Illinois. Coll. P. H. Carpenter. x 3 . . 95 



Granatocrinus Norwoodi, 0. § S., p. 245. 



Figs. 32-35. Outline radial views to show the variability in form, and especially in the 



transverse diameter. Subcarbonifcrous, North America 107 



Fig. 36. Summit view of a distorted tetraradiate specimen, in which one of the radials is 

 replaced by a large irregular plate bearing no ambulacrum. Subcarboniferous, 

 Iowa. Coll. Waclismuth. x H 41 



Ph^noschisma Benniei, E. §• C, p. 278. 



Fig. 37. Intcrradial view of a more or less crushed specimen, in which the hydrospire-slits 

 are visible on the sides of the radial sinuses. Carboniferous Limestone, 

 Scotland. Coll. P. H. Carpenter. x 8 88 



Figs. 38-42. A series of ambulacra found associated with the above species. Fig. 38, 

 reverse or under side, showing the tops of four necks of the hydrospire-sacs. 

 Fig. 39, side view of another specimen, in which one of the lateral hydrospire- 

 folds is visible. Fig. 40, the ambulacrum seen from above. Fig. 41, reverse 

 view of another specimen of the lancet-plate. Fig. 42, the same parts in another 

 individual. Coll. Geoloyical Survey of Scotland. x 7 to 8 279 



ELJiACRINTTS ANGULARIS, Lyon, p. 219. 



Fig. 43. Radial view of a specimen partly imbedded in matrix. Corniferous Group, North 



America. xH 12 



Fig. 44. Summit view of the same specimen. x lj 218 



Elyeacrinus Verneuili, Roemer, p. 216. 

 Fig. 45. Basal view drawn from two well-preserved specimens, showing the deeply concave 



centre and the interbasal sutures. Corniferous Group, Kentucky, x 4 . . . 15 



Elsaceinus Verneuili, var. pomum, E. if C, var., p. 218. 

 Fig. 16. Radial view of the globose variety of E. Verneuili separated under the above 



name. Corniferous Group, Kentucky. Coll. G. J. Hinde. Natural size. . 12 



