Urasterella Stella nov. 



Page 49 

 (See pi. 12, figs, i and 2) 



1 Paratype; exhibits actinal view with wide open ambulacral 



groove in ray on right-hand side and nearly closed groove on- 

 left-hand, x 4. 

 Devonian: Portage group (Middle Grimes sandstone), near 

 Naples, N. Y. 



Urasterella lutheri nov. 



Page 47 



(See pi. 14, figs. 1-4) 



2 Portion of actinal view of ray, showing the wide open ambula- 



cral groove, with its long narrow ambulacral ossicles. The 

 coin-shaped adambulacrals are seen on the left turned over on 

 their flat sides, and one to two columns of stellate or irregular 

 ambitals pressed out from the abactinal side, x 5. 



3 Portion of actinal view of ray of other specimen, where the 



adambulacrals are seen in their normal position, x 5. 



4 Portion of abactinal side of ray from margin (base) to median 



line of ray (top), showing the columns of stellate radials and 

 ambital ossicles, x 5. 



5 Portion of actinal side near distal end of ray. The ambulacrals 



are lost ; the adambulacrals are relatively thick and the ambitals 

 more regular, x 5. 



6 Portion of actinal view of base of ray and of oral armature. 



aw&=ambulacrals ; oJ=adambulacrals ; ax= axillary; am= 

 ambitals ; or=oral plates, x 5. , 

 Devonian: Portage beds (West Hill flags), Deyo Basin, near 

 Naples, N. Y. 



Urasterella sp. 



Page 51 



7 Portion of abactinal view of ray. x 5. 



8 Supposed paxillae. x 10. 



Devonian : Ithaca beds, Messengerville, Cortland county, N. Y. 

 The originals are in the New York State Museum. The draw- 

 ings are made from camera lucida enlargements. 



174 



