Devonaster eucharis (Hall) 



Page 33 



(See plate 8) 



i Youngest specimen observed. Abactinal view, x 6, showing 

 early stellate growth-stages of plates and large central plate. 



2 Early growth-stage, with still distinctive central plate and first 



ring of five plates of abactinal disk area ; a very few accessory 

 plates are seen on the rays, x 5. 



3 View of oral portion of young specimen, x 5. 



4 Interior (dorsal) view, of ambulacral ossicles (amb); ad=- 



adambulacrals ; / is a cast of the interambulacral space, x 5. 



5 A separate ambulacral ossicle. 



6 Ambulacral groove Of a young specimen, from a gutta-percha 



squeeze, x 5. 

 Devonian: Hamilton' beds, Saugerties, N. Y. 

 The originals of the drawings are in the New York State Museum. 



The drawings are made from camera outlines. 



166 



