PLATE IL 



Photographs of Casts showing Apical Surface. 



Fig. Page 



1. Coccaster hulbiferus, n. sp. — Upper Sikirian (Lo\7er Ludlow) ; Leint- 



wardine, Herefordshire, x 4^. Royal Scottish Museum, Edinburgh, 

 no. 65/158 a. 75. 



2. Mesopalseaster primus, n. sp. — Upper Ordovician (Ashgillian) ; Thraive 



Glen, Ayrshire, x 4^. Mrs. Gray's Collection, no. D. 70. 84. 



3. Mesopalxaster ? sp. — Upper Silurian (Wenlock) ; Gutterford Burn, Pent- 



land Hills. x4. Royal Scottish Museum, no. 183. 90. 



4. Caractacaster caractaci, Gregor}^ sp. — Ordovician (Caradocian) ; Marsh- 



brook, Church Stretton, Shropshire, x 2. Museum of Practical 

 Geology, London, no. 4/30. 80. 



5. Mesopalseaster ? leintwardensis, n. sp. — Upper Silurian (Lower Ludlow) ; 



Leintwardine, Herefordshire, x 4. British Museum (Nat. Hist.), 

 no. E. 13153. 89. 



6. Belaster ordorlcns, n. sp. — Upper Ordovician (Ashgillian) ; Thraive Glen, 



Ayrshire, x 3^. Mrs. Gray's Collection, no. D. 44. 73. 



6 a. Ditto ; extremity of arm of same specimen, x 7. 73. 



7. Gircanaster sculptns, n. sp. — Ibid, x 4. Mrs. Gray's Collection, no. 



D. 152. 70. 



8. Caractacaster caractaci, Gregory sp. (?). — Upper Ordovician (Lower 



Bala) ; near Bala Lake, Wales, x 4|. T. Ruddy Collection, British 

 Museum (Nat. Hist.), no. E. 13531. 83. 



9. Mesopalseaster complicatus, n.sp. — Upper Ordovician (Ashgillian); Thraive 



Glen, Ayrshire, x 4. Mrs. Gray's Collection, no. D. 133. 87. 



