PLATE XXI. 



Fig. 1. Uraster spiniger, Wright. Under surface (reversed by the artist), magnified 



two diameters, from the Porest Marble near 

 Road, Wiltshire. My collection. 



2. Stellaster Berthandi, Wriglit. Under surface, natural size. This beautiful 



form was collected from the " Calcaire a 

 Entroques," Inferior Oolite, near Macon, 

 by Professor Berthandi, of Macon, 

 Saone-et-L6ire, France. My collection. 



3. Astropecten Hooperi, Wright. The under surface of this Astropecten, which 



was collected from the Cornbrash at 

 Horsington, Dorset, in 1828. The 

 figure is a copy of a woodcut published 

 in Loudon's * Magazine,' vol. ii, p. 73. 

 The specimen cannot be traced, and 

 therefore the original drawing is repro- 

 duced for this work. 



4. Ophiolepis Damesii, Wright. Under surface, magnified two diameters. My 



collection. 



5. — — — Upper surface of another specimen, magnified 



two diameters. Collected from the Avicula 

 contorta beds at Garden Cliff, near West- 

 bury, on the Severn. The first known 

 ginal specimens were found in the Avicula 

 contorta bed near Hildesheim, N. Ger- 

 many, and the same species has since been 

 found in the same horizon in England at 

 two or three localities. 



