PLATE VII. 



Fig. Page. 



1. Lepidaster grayi, Forbes; photograph of oral surface, x H to 2 



(approx.). — Middle Silurian (Wenlock) ; Dudley. Museum of 

 Practical Geology, Jermyn Street, no. 27515; M., madreporite . 117 



2. Wash drawing of a portion of arm of same specimen. X 10 (approx.). 



A., ambulacral; Ad., adambulacral ; I.M., inferomargmal . 118 



3. Wash drawing of a pair of mouth-angle plates of the same specimen 



showing also the torus with some of its spines, X 10 . .118 



4. Side view of an adambulacral from the same specimen, X 10. P., 



point of attachment of the adambulacral with a ventro-lateral . 119 



5. Wash drawing of a model of three adjacent proximal adambulacralia 



of the same specimen, X 10 (approx.). R., ridge of adambulacral ; 



P., point of attachment of the adambulacral with a ventro-lateral . 119 



6. Photograph of another individual of the same species, X f. Ibid. 



Dudley Museum, no. GOG . . . . .120 



