236 THE DEVONIAN OF MISSOURI. 



ance, while in the New York specimens this is a feature of the immature forms only. 

 The Little Saline specimens are considerably smaller than those from Quebec. 

 Horizon — Lower beds. 



Figured specimens No. 27472 Walker Museum. 



Brachyprion sp. 

 Plate 62, figures 8-10. 



Description — Shell small, semi-circular to elongate oval. The dimensions of two 

 brachial valves are: Length 12 mm., width 13 mm., and length 10 mm., width 11 mm. 



Brachial valve deeply concave, hinge line straight, cardinal extremities rounded. 

 The hinge line is finely crenulated, the crenulations extending over half the distance 

 to the extremities. A cast of the interior shows the well-defined crural process, and the 

 pustulose character of the surface. Exterior marked by numerous, irregular and unequal 

 costae which are crossed by coarser concentric lines of growth. 



Pedicle valve unknown. 



Remarks — Impressions of the exterior of the brachial valve, and casts of the interior 

 of the same valve have been observed. The species seems to be distinct from Brachyprion 

 schuchertanum Clarke in that it is proportionately smaller and longer. 



Horizon — Lower beds. 



Figured specimens No. 27471 Walker Museum. 



Genus Schuchertella Girty 



Schuchertella sp. 



Plate 62, figure 11. 



Description — Shell of medium size, transversely elliptical, broader than long. 

 The dimensions of a brachial valve are: Length approximately 31 mm., width 48 mm., 

 the hinge line equal to the greatest width of the shell. 



Pedicle valve moderately convex, the maximum convexity anterior to the umbonal 

 region. From the middle, the surface the shell slopes toward the cardinal extremities 

 in a manner to form a gently concave area upon each side. Surface marked by fine 

 radiating costae, which increase by interstitial addition, there being about 20 in the 

 space of 1 mm. 



Remarks — One incomplete pedicle valve only occurs which is not certainly deter- 

 minable. 



Horizon — Lower beds. 



Figured specimen No. 27470 Walker Museum. 



Family Productidae 



Genus Anoplia Hall and Clarke 



Anoplia nucleata (Hall) 



Plate 63, figure 5. 



1857. Leptaena nucleata Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 47. 

 1859. Leptaena nucleata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 419, pi. 94, figs. la-Id, 



1861. 

 1892. Anoplia nucleata Hall and Clarke, ibidem, vol. 8, pt. 1, p. 309, pi. 15a, figs. 17, 



18; pi. 20, figs. 14-17. 

 1903. Anoplia nucleata Weller, Geol. Surv., N. J. Pal., vol. 3, p. 325, p. 41, fig. 9; 



p. 349, pi. 46, figs. 8-10. 

 1908. Anoplia nucleata Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 211, pi. 41, 



figs. 15-17. 



