PLATE 31. 

 Palaeechinus elegans M'Coy. Page 308. 



Fig. 1. Same specimen as photograph, Plate 29, fig. 3. Holotype. X 1.8. Ambulacra narrow, plates all primaries, pore- 

 pairs uniserial. Five columns of plates in an interambulacral area. (Compare text-figs. 9, p. 54; 15, p. 59; 237, 

 p. 231.) 



Fig. 2. Same specimen. X 5.4. Ambulacra! detail from the area marked X in fig. 1. Ambulacral plates all primaries, 

 pore pairs uniserial. 



Fig. 3. Same specimen, showing ambulacral plates beveling over the adradials. X 1.8. 



Fig. 4. Same specimen, dorsal area. X 3.5. In area E, column 5 drops out dorsally; oculars shaded, all are imperforate, 

 reaching the periproct and adorally covering the ambulacra and laterally the interambulacra in part on either side. 

 Four genitals nearly or quite in place with three, four, or five pores each; by oversight only three pores are shown 

 in genital A, whereas there should be five pores as seen in the enlarged photographic figure (Plate 29, fig. 6) ; genital I 

 is wanting. Plates of the periproct are thick and angular. 



Fig. 5. Lower Carboniferous, Hook Point, Wexford, Ireland. Museum of Practical Geology Coll., London, 6,580. X 2.7. 

 Five columns of plates in interambulacrum A and spines in place. For an enlarged ambulacrum of the same 

 specimen, see Plate 30, fig. 11. 



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



Fig. 6. Same specimen as photograph, Plate 29, fig. 7. Holotype. X 2.7. Internal mold. Ambulacra narrow; all 

 plates (at least in this internal view) primaries with pore-pairs uniserial. The lower part of the figure drawn from 

 area I, is restored ventrally as indicated by dotted lines, and shows the introduction of columns 4, 5, and 6. The 

 upper part of the figure is drawn from area E. The sixth and third columns drop out dorsally. The apical disc 

 is small, oculars are all insert, genitals each with three pores. 



Palaechinus (?) konigii M'Coy Page 450. 



Fig. 7. Same specimen as photograph Plate 29, fig. 9 (after M'Coy, 1844, Plate 24, figs, la, lb). Holotype. X 0.9 and 

 enlarged. Interambulacral plate, such being all that is known of the species. 



Fig. 5 drawn by G. C. Chubb; figs. 1-4 from my sketches; fig. 6 from nature; and fig. 7 from M'Coy by J. Henry Blake. 



