Encrinaster pusillus nov. 

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1 Portion of type specimen drawn under water and showing the 



impressions of middle columns of ambulacral plates and two 

 flanking columns of larger adambulacral plates; also the im- 

 pressions of the oral ossicles and of the disk, x 6. 



2 The entire type specimen (holotype), x 4. The upper right-hand 



ray exhibits the casts of the water vessels, namely, — originally 

 situated within the ambulacralia — the median interskeletal 

 canal with short side branches ending in nodes, the casts of 

 depressions which served for the ampullae or for these and the 

 podial insertions. The adambulacral plates do not appear in 

 this drawing since they become distinct only under water. 

 Devonian : Chemung beds, Elmira, N. Y. 



Eugasterella logani (Hall) 



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3 Portion of ventral aspect of ray of type specimen to show the 



form of the ambulacral and adambulacral ossicles, x 5. 



4 Oral portion of type specimen seen from actinal side, x 5. 



5 Actinal view near tip of ray of type specimen, showing' the 



ambulacral groove closed by adambulacrals. x 5. 

 Hamilton beds, Fenner, Madison county, N. Y. 

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



The drawing's are made from camera lucida outlines. 



