328 REPORT ON THE STATE CABINET. 



Some figures of a Pal^aster, closely allied to or identical with this 

 one, from Cincinnati, Ohio, have been circulated by the Natural History 

 Society of that place, under the name of Asterias primordialis ; but no 

 description of it has ever been published, so far as I know, nor do I find 

 it at all recognized in the catalogues. 



Geological Formation and Locality. — In shales of the Hudson River 

 group, Lebanon, Ohio. From J. Kelly O'Neall, Esq. 



Pal^aster wilberanus. 



Petraster wilberanus, Meek & Wokthen; in Proc. Acad. Nat. Sci. Phil., p. 142, 1861. 



The description informs us that "this beautiful star-fish resembles 

 rather closely the Petraster rigidus of Billings (Decade iii, Canadian 

 Organic Remains^ Plate ix, fig. 3 a), but is smaller, and has more slender 

 rays, with more angular spaces between them. It also differs in having 

 but two ranges of plates on each side of the ambulacral grooves on the 

 under side, instead of three." 



The fact of having two ranges of plates only on the lower side must 

 separate this species from Petraster of Billings, since the presence of a 

 partial intermediate range, or " a few disc-plates" on the ventral side 

 form an essential feature of that genus. 



Geological Formation and Locality. — In the Lower Silurian strata of the 

 age of the Trenton or Hudson River group, at Oswego, Kendall county, 

 Illinois. 



Pal^aster antiquatus. 



AsUrias antiquata, Locke ; in Proc. Acad. Nat. Sci. Phil., Ill, p. 32 (with wood-cut), 1846. 



This species was noticed by Dr. Locke, as cited above, but without 

 specific description, and expressing a doubt whether it was or was not 

 identical with the Asterias antiqua of Troost. The figure would indicate 

 a distinct species from that of Dr. Troost ; and if we can judge from the 

 illustration, it is not a Palasterina. The question may not be determined, 

 however, without reference to the original specimen. 



In the figure of Dr. Locke there are two ranges, and in some places 

 three ranges of plates, represented as bordering the ambulacral groove. 



Geological Formation and Locality . — The specimen is from the shales of 

 the age of the Hudson River group, near Cincinnati, Ohio. 



