PLATE 72. 

 Lepidesthes extremis sp. nov. Page 430. 



Fig. 1. Putnam Hill Limestone, Carboniferous (Coal Measures), New Lexington, Perry County, Ohio, collected by Mr. 

 Eber Hyde, who loaned the specimen, which is no. 52-4 of his collection. Holotype. Natural size. Internal sili- 

 ceous mold of the ventral side. A large powerful species with 16 columns of plates in an ambulacral area at I he mid- 

 zone and four columns of plates in each interambulacral area; an impression of a powerful lantern ventrally. The 

 largest and geologically the highest species of the genus. Drawing, Plate 71, fig. 2. 



Fig. 2. The same specimen, dorsal view, internal mold. Natural size. In area G are seen impressions of four columns of 

 interambulacral [dates between the ambulacral areas F and II. Pores in the ambulacral plates are marked by elevated 

 siliceous plugs. Drawing, text-fig. 252, p. 431. 



Lepidesthes caledonica sp. nov. Page 432. 



Figs. 3-10. Lower Carboniferous Limestone, Roscobie, Fifeshire, Scotland. All in the British Mus. Coll. 



Fig. 3. British Mus. Coll., E 10,710, holotype. Ambulacral plate, from a right column next to an interambulacrum as 



indicated by the beveling on the right, oriented by the dorsal bevel which is strongly marked. The pore-pair is in 



a faint peripodium, and secondary tubercles exist. X 10. 

 Fig. 4. Holotype, E 10,710. Another ambulacral plate, similar to fig. 3. X 10. 



Fig. 5. Holotype, E 10,710. Interambulacral plate, showing beveling ventrally and secondary tubercles. X 10. 

 Fig. 6. Paratype, E 10,711. Another interambulacral plate, similar to fig. 5. X 10. 



Fig. 7. Holotype, E 10,710. Spines. X 20. They are tapering, swollen at the base, and longitudinally finely striate. 

 Fig. 8. Paratype, E 10,712. Pyramid. X 3. The pyramid is wide-angled, foramen magnum shallow, median suture 



plain. 

 Fig. 9. Same specimen seen from within, part of a grooved tooth in place. X 3. 

 Fig. 10. Paratype, E 10,704. Another pyramid, side view, faintly showing ridges for the attachment of interpyramidal 



muscles. X 3. 



Pholidocidaris tenuis Tornquist. Page 440. 



Fig. 11. Lower Carboniferous Limestone, Coplaw, Clitheroe, Lancashire. Museum of Practical Geology Coll., London, 

 10,304. X 2. Large, rounded, strongly imbricating interambulacral plates with eccentric primary, and secondary 

 tubercles. A small ambulacral plate on the left is partially hidden, and there is a large plate in the center of the 

 figure, which is apparently an ambulacral, with two pores (possibly these supposed pores are mechanically worn pits 

 hi an interambulacral plate). 



Melonechinus multiporus (Norwood and Owen). Page 375. 



Fig. 12. Upper St. Louis Limestone, Lower Carboniferous, St. Louis, Missouri. F. Springer Coll., S.117 (from G. Ham- 

 bach Coll., H 14). Described as the holotype of Meloiiil.es irregularis Hambach, here considered a synonym. 

 Natural size. Very imperfectly preserved. Ten columns of plates in an ambulacrum at the mid-zone. In the 

 interambulacra there are seven columns of plates at the mid-zone in three areas; the other interambulacral areas 

 are only preserved ventrally where there arc live columns as usual in most species of the genus at that area (p. 380). 

 The orientation is reversed from that given by Hambach. 



Figs. 1, 2. and 12 from photographs by F. A. Saunderson; rigs. 3-11 drawn by G. C. Chubb. 



