PLATE XXV. 



NYMPHASTEE EADIATUS, n. sp. (Page 73.) 



From the Loiver Chalk. 



FIG. 



1. Abactinal view ; natural size. (Coll. Brit. Mus., E. 375.) 



a. Lateral view of margin ; natural size. 



b. Supero-marginal ossicle ; magnified 4 diameters. 



ASTEOPECTEN ? n. sp. (Page 90.) 

 From the Upper Greensand. 



2. Abactinal view ; natural size. (Coll. Sedgwick Museum, Cambridge.) 

 a. Isolated marginal ossicle ; magnified 4 diameters. 



PENTACEEOS SQUAMATUS, Forbes, sp. (Page 83.) 

 From the Upper Chalk. 



3. Abactinal view ; natural size. (Willett Coll., Brighton Mus.) 



a. Madreporite ; magnified 6 diameters. 



b. Marginal view of arm ; natural size. 



c. Supero-marginal ossicle; magnified 6 diameters. 



PENTACEEOS OCELLATUS, Forbes, sp. (Page 85.) 

 From the Upper Chalk. 



4. Actinal view ; natural size. (Coll. Brit. Mus., E. 5012). 

 a. Ventro-lateral ossicle ; magnified 4 diameters. 



PENTACEEOS PISTILLIFEBUS, Forbes, sp. (Page 88.) 

 From the Upper Chalk. 



5. Ossicles of disc ; natural size. (Coll. Brit. Mus. ; from left to right the 



register numbers are E. 5037, 57634, E. 2564.) 



GENUS ? sp. ? (Page 93.) 

 From the Chalk. 



6. Ossicles; natural size. (Coll. Brit. Mus.) 

 a. Isolated ossicle ; magnified 4 diameters. 



PENTACEKOS ? n. sp. (Page 89.) 

 From the Chalk. 



7. Marginal view of ossicles of arm ; natural size. (Coll. Brit. Mus., 5514.) 



PENTACEEOS ? n. sp. (Page 89.) 

 From the Chalk. 



8. Marginal view of ossicles ; natural size. (Willett Coll., Brighton Mus.) 



PENTACEEOS COEONATUS, Forbes sp. (Page 82.) 



9. Madreporite; magnified 4 diameters. (Coll. Brit. Mus., 35480.) 



