PLATE 35. 

 Maccoya gracilis (Meek and Worthen). Page 323. 



Fig. 1. Upper Burlington Limestone, Lower Carboniferous, Burlington, Iowa. Mus. Comp. Zofil. Coll., 3,052, holotype. 



X 2. Ainbulacral plates alternately primary and occluded; seven columns of interambulacral plates in area A. 



Drawing, Plate 34, fig. 11. 

 Fig. 2. Waverly Group, Lower Carboniferous, Menifee County, Kentucky. Mus. Comp. Zool. Coll., 3,062. Natural 



size. An external sandstone mold. Drawing, Plate 34, fig. 12. 

 Fig. 3. Same specimen. X 2. Seven columns of interambulacral plates at the mid-zone, eight dorsally in each area anil 



nine columns near the apical disc in area C. Apical disc small. Fig. 2 was lighted from the left and the specimen 



looks hollow as it is; on the contrary, fig. 3 was lighted from the right and looks in relief, which it is not. The outline 



of the interambulacral plates and even spine tubercles it. very clear for a sandstone mold. As it is an external mold, 



the orientation is reversed. 



Lovenechinus lacazei (Julien). Page 326. 



Fig. 4. Lower Carboniferous, Armagh, Ireland. British Mus. Coll., E 10,051. Natural size. Four columns of plates 

 in three interambulacral areas; exsert oculars and genitals in place (p. 328). Drawing, Plate 36, fig. 6. 



Fig. 5. Same horizon and locality, British Mus. Coll., E 10,052. Natural size. Shows general spheroidal form and four 

 columns of plates in two interambulacral areas (p. 328). Drawings, Plate 36, figs. 4, 5. 



Fig. 6. Lower Carboniferous Limestone, Llysfaen, near Llandulas, Wales. British Mus. Coll., E 3,432. Natural size. 

 Four columns of massive interambulacral plates in area A (p. 329). Drawings, Plate 36, figs. 7, 8. 



Fig. 7. Lower Carboniferous Limestone, Kirkby Stephen, Westmoreland, England. Yorkshire Philosophical Soc. Coll. 

 Enlarged X about 1.6. This photograph was taken for me through Dr. F. A. Bather's kindness. Four columns 

 of plates in each ambulacra! area and four columns of plates in each interambulacral area, genitals and small exsert 

 oculars in place. This specimen is of much importance as the original described by de Konirick (I860. 1X70) as 

 "Palaechiniixsphaericus," from which species, however, it differs radically in structure, as shown by the drawings 

 and by Dr. Bather's description (pp. 330-334). Drawings, text-figs. 240-243, p. 331. 



Fig. 1 from photograph by H. W. Tapper; figs. 2, 3 by F. A. Saunderson; figs. 4-6 taken at the British Museum; fig. 

 7 by H. Herring at the British Museum. 



