PLATE 29. 

 Palaeechinus quadriserialis Wright. Page 305. 



P'ig. 1. Lower Carboniferous Limestone, Rathkeale, County Limerick, Ireland British Mus. Coll., E 193. Natural 

 size. Test elliptical, ambulacra narrow, four columns of plates in each interambulacral area. Apical disc small. 

 Drawings, Plate 30, figs. 1-4. 



Palaeechinus ellipticus M'Coy. Page 307. 



Pig. 2. Lower Carboniferous, Millicent, Clare, County Kildare, Ireland. Holotype. Natural size. Griffith Collection, 

 Science and Arts Mus. Coll., Dublin. Test elliptical, ambulacra narrow, five columns of plates in each interambul- 

 acral area. Drawings, Plate 30, figs. 8-10. 



Palaeechinus elegans M'Coy. Page 308. 



Fig. 3. Lower Carboniferous, Hook Head, Fethard, County Wexford, Ireland. Holotype Natural size. Griffith Collec- 

 tion, Science and Arts Mus. Coll., Dublin. Test spheroidal, ambulacra narrow, five columns of plates in each inter- 

 ambulacral area, apical disc and periproct well preserved. Apical disc small, being proportionately about 16 % of 

 the diameter of the test. Drawings, Plate 31, figs. 1-4. 



Fig. 4. Another specimen of this species on the same slab. 



Perischodomus biserialis M'Coy. Page 401. 



Fig. 5. On same slab as figs. 3, 4. Cotype. Natural size. Dorsal view; one of M'Coy's two original specimens of this 

 species. Interambulacral plates rounded and imbricating dorsally and from the center of each area laterally and 

 over the ambulacra (pp. 402, 403). 



Palaeechinus elegans M'Coy. Page 308. 



Fig. 6. Same specimen as fig. 3. apical region enlarged. X 4. Oculars imperforate, adorally covering the ambulacra and 

 laterally the interambulacia in part on either side. Though the oculars are imperforate, Baily in his figure of this 

 specimen shows two pores in each ocular plate (pp. 309, 363). Genitals with 3 to 5 pores each, genitals E and G 

 have three pores each, genital C has apparently four pores, and genital A has five pores; a number of periproctal 

 plates are in place. Drawing, Plate 31, fig. 4. 



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



Fig. 7. Kinderhook Group. Lower Carboniferous, Burlington, Iowa. Chicago Univ. Coll., 9,054, holotype. Natural 

 size. Internal sandstone mold. Ambulacra narrow, six columns of plates in an interambulacral area. Drawing, 

 Plate 31, fig. 6. 



Fig. 8. Upper Burlington Limestone, Lower Carboniferous, Burlington, Iowa. Mus. Comp. Zool. Coll., 3,051, paratype. 

 Natural size. Internal sandstone mold. Six columns of plates in four interambulacral areas, but in one interam- 

 bulacral area there are only five columns of plates. Impressions of all oculars and genitals in place. Oculars all 

 insert. Apical disc measures S mm. in diameter. 



Palaechinus (?) konigii M'Coy. Page 450. 



Fig. 9. Arenaceous shale, Lower Carboniferous, Rahan's Hay. Dunkineeley, County Donegal, Ireland. Griffith Collec- 

 tion, Science and Arts Museum, Dublin. Holotype. Natural size. Interambulacral plates only. Drawings, 

 Plate 31, fig. 7. 



Fig. 1 photographed at the British Museum; figs. 2, 9, by A. C. Bridle in Dublin; figs. 3-7 by F. A. Saunderson; fig. 8, 

 by H. W. Tupper. 



