302 



NEW YORK STATE MUSEUM 





some specimens of large size, twice the usual dimensions of G. speciosa 

 (B. retrostriata) which are distinctly different from that species in the 

 following respects of ornamentation. The ribs, generally not more than 

 12, are elevated and bounded by vertical margins which the transverse orna- 

 ment does not pass. In the umbonal region these ribs bear retrally curved 

 nodes of irregular size though in regular zonal arrangement, and all quite 

 large and conspicuous, giving the surface a scabrous aspect. Toward the 

 margins these nodes become suppressed and the surface acquires the char- 

 acter usual throughout in B. retrostriata. Fine concentric and 

 regular lines cover the coarser nodes. The grooves between the ribs are 

 concave and smooth. 



The character of this ornament suggests that of B. scabrosa, but is 

 much less regular, the margins of the ribs are here elevated, and the shell 

 much larger. It is even more closely allied to B. ferruginea Holzapfel 1 

 from the middle Devonic (Stringocephlenkalk) of Martenberg, also 

 described and figured by Beushausen. 2 This shell is also small but it has 

 the ribs with elevated margins and nodose, if somewhat more regular, sur- 

 face not shading out toward the margin. One of the depauperated and 

 arrested shells described by Loomis from the pyrite layer at the horizon of 

 the Tully limestone is such a scabrous shell of Buchiola, representing an 

 earh' growth stage of this species or perhaps of B. halli. J It is interesting 

 to note that this coarse nodose ornament is a character of primitive growth 

 and, as shown by adult shells both of B. h a 1 1 i and B. scabrosa, becomes 

 obsolete in senile stages. 



Dimensions. Average specimens measure ii mm in length and io mm 

 in hight. 



Occurrence. In the Marcellus shale near Skaneateles 4 and in the 

 Hamilton shales at Shurger's glen and Norton's landing, Cayuga lake. 



Buchiola cf. priimiensis Steininger (sp.) 



Plate io, fig. iS, iu 



See Cardium prumiense Steininger, Geognost. Beschreibung der Eifel. 1853. 



P- 5 J i P 1 - 3. fi g- 3 

 Buchiola priimiensis Beushausen, Die Lamellibr. des rhein. Devon. 1895. 



p. 336, pi. 34, fig. 13, 14 



The sandy shales of Erie county have afforded a few specimens of a 

 shell characterized by its suborbicular form, low flattened ribs, 12 to 15 in 



■Das obere Mitteldev. im rhein. Gebirge. 1895. p. 229, pi. 11, fig. 16. 

 2 Die Lamellilbr. des rhein. Devon. 1895. p. 329, pi. 35, fig. 4-6. 

 3N. Y. State Pal. Rep't. 1903. pi. 2, fig. 7. 

 •*Pal. N. Y., loc cit. pi. 70, fig. 9. 



