PLATE 32. 

 Maccoya burlingtonensis (Meek and Worthen). Page 312. 



Figs. 1-3. Upper Burlington Limestone, Lower Carboniferous, Burlington, Iowa. 



Fig. 1. F. Springer Coll., 8,003. Natural size. Ventral view. Ambulacral plates ventrally are all primaries, pore-pairs 

 uniserial. At the mid-zone plates are alternately primaries and occluded, pore-pairs biserial. Interainbulacrum 

 in the basicoronal row with two plates, in the second row three plates, and in the third row four plates. Drawing, 

 Plate 33, fig. 1. 



Fig. 2. E. Kirk Coll. Natural size. Median and dorsal area. Ambulacral plates at the mid-zone are alternately pri- 

 maries and occluded; pore-pairs biserial, dorsally in the placogenous zone; the ambulacral plates are all primaries 

 and pore-pairs are uniserial. Four columns of plates in interambulacral area A. Tubercles alike on all plates, 

 ambulacral and interambulacral. Drawing, Plate 33, fig. 2. 



Fig. 3. F. Springer Coll., 8,002. Natural size. Dorsal half of test. Four columns of plates in each interainbulacrum. 



Maccoya sphaerica (M'Coy). Page 317. 



Fig. 4. Lower Carboniferous, Waterford, County Wexford, Ireland. British Mus. Coll., E 361. Natural size. Ambulacra 

 narrow, pore-pairs biserial at the mid-zone. Five columns of plates in each interambulacral area Oculars all 

 insert, periproct exceptionally perfect (p. 319). Drawings, Plate 34, figs. 4-6. 



Fig. 5. Lower Carboniferous, probably County Kildare, Ireland. Trinity College Coll., Dublin. Holotype. Natural 

 size. Ambulacra narrow, six or seven columns of plates in each of the several interambulacral areas (p. 318). Draw- 

 ing, Plate 34, fig. 7. 



Pholidechinus brauni sp nov. Page 299. 



Fig. 6. Keokuk Group, Lower Carboniferous, Crawfordsville, Indiana. F. Springer Coll., 8,019, paratype. Natural size. 

 An internal mold, with nine columns of plates in interambulacral area A, the median column is very narrow. (Com- 

 pare similar view of Koninckocidaris, Plate 20, fig. 5.) 



Palaeechinus (?) minor sp. nov. Page 310. 



Fig. 7. Base of Burlington Limestone, Lower Carboniferous, Burlington, Iowa. E. Kirk Coll. Paratype. Natural 

 size. Six columns of plates in each of the five interambulacral areas. 



Figs. 1-3, 0, 7 from photographs by F. A. Saunderson; fig. 4 taken in the British Museum; fig. 5 taken in Dublin by 

 A. C. Bridle. 



