PLATE IV. 



Mesoblastus crenulatus, Roemer, sp., p. 183. 



Page 



Fig. I. Summit view, showing the deltoid plates, douhle spiracles, and the outer lip-like 



margin of the anus. Carboniferous Limestone, Belgium. x 4 104 



Fig. 2. Portion of a weathered ambulacrum, highly magnified, with the partially exposed 



lancet-plate 61 



Mesoblastus Rofei, E. if C, p. 188. 

 Fig. 3. Radial view of a broken and imperfect specimen, showing a narrow radial sinus and 



its ambulacrum. Carboniferous Limestone, Lancashire 235 



Fig. 4. Portion of an ambulacral field of the same specimen, with the exposed lancet-plate 



and hydrospire-plates, five side-plates, and the hydrospire-pores. x 10 . . 49 



Ph«noschisma Benniei, E. fy C, p. 278. 

 Fig. 5. Radial view of a crushed example. Carboniferous Limestone, Scotland. x 6 . 278 

 Fig. 6. Summit view of the same specimen. x 6 278 



Pentremitidea ? Whidbornei, E. if C. 

 Fig. 7. Summit view of the only specimen known. Middle Devonian, S. Devon. Coll. 



Whidborne. x2 130 



Pentremitidea Paillettei, de Verneuil, sp., p. 172. 

 Fig. 8. Summit view, with the small lanceolate deltoids and large anus. Lower Devonian, 



Asturias. x5 104 



Fig. 9 Interradial view of another specimen. Lower Devonian. Locality unknown. 



Coll. Wachsmuth. x 2 24 



Fig. 10. Summit view of the same specimen. x4 104 



Pentremitidea Lusitanica, E. if C, p. 173. 



Fig. 11. Interradial view of a specimen, with the lower end of the basal cup broken. Lower 



Devonian, Asturias. xll 24 



Fig. 12. Summit view, with the anal interradius in great measure estroyed, and the lancet- 

 plates of three ambulacra partially exposed. Lower Devonian, Asturias. x 3 . 104 



Fig. 15. Portion of an ambulacrum near its distal end, showing the peculiar wedge-shaped 



form of the outer side plates. x 10 62 



Pentremitidea angulata, E. if C, p. 179. 



Fig. 13. Interradial view, showing the angular radials, broken base, and the interradial 



projections. Lower Devonian, Asturias. x 2 17 



Fig. 14. Summit view of the same, showing the decagonal outline and the much weathered 



ambulacra. x 3 104 



Fig. 16. Basal view, with the decagonal outline and trihedral base. x 2 17 



Pentremitidea clavata, Schultze, sp., p. 176. 

 Fig. 17. Summit view, with the side and outer side plates visible in the ambulacra, and a 



septum in one spiracle. Middle Devonian, Eifel. x 4 104 



Fig. 18. Radial view of the same, the basal cup broken. x3 11 



