224 Systematic Paleontology — Middle Devonian 



PaNENKA Cf. DICHOTOMA Hall 

 Plate XXIII, Fig. 5 



Cardiola ? dichotoma Hall, 1883, Pal. N. Y., vol. v, pt. 1, plates and explana- 

 tions, pi. 70, fig. 21. 



Panenka dichotoma Hall, 1885, New York State Geol. Surv., Paleontology, 

 vol. V, pt. i, Lamellibr., p. 416, pi. Ixx, fig. 21; pi. xciv, fig. 13. 



Description. — A fragmentary right valve which is shown in the figure 

 is believed to represent this species. The imperfection of the specimen, 

 however, scarcely permits of definite specific determination. 



Beak prominent, incurved and distinctly directed fonvard. Surface 

 marked by prominent, rather slender, closely placed plications which 

 occasionally bifurcate. Fine concentric striae cross the plications. 



Occurrence. — Eomney Formation, Onondaga Member. One mile 

 east of Oldtown. 

 ■ Collection. — U. S. Xational Museum. 



[E. M. Kindle.] 

 Panenka obsolescens n. sp. 



Plate XXIV, Figs. 2, 3 



Description. — Shell large, broadly ovate, depressed convex, length ex- 

 ceeding the height. Pallial margin regularly rounded from the anterior 

 to the middle of the posterior end whence it extends in a nearly straight 

 line to the hinge-line, curving slightly forward before reaching it. Hinge- 

 line long and straight. Surface marked by fine concentric striae and 

 numerous radii which become obsolescent in the posterior third of the 

 shell. The resulting smooth, nearly flat posterior third of the shell, 

 together with the nearly straight upper half of the posterior margin 

 nearly vertical to the hinge-line, are the distinctive features of the species 

 which sharply distinguish it from any other shell known to the author. 

 The species is represented by a single right valve; this has the beak 

 broken away so that its shape and extension as suggested by the line in 

 the figure can only be inferred. 



Occurrence. — Eomney Formation, Onondaga ^Member. One mile 

 east of Oldtown in cut of Western Maryland Railroad. 



Collection. — U. S. National Museum. 



[E. M. Kindle.] 



