238 Systematic Paleontology — Middle Devonian 



P. constricta Hall but as stated by Hall it is distinguished by its delicate 

 texture, smaller size, more elongate form, and more central beaks. 



Length, of the smaller specimens, 11 mm. ; height, 6 mm. 



A larger specimen which is referred to this species is 23 mm. in length 

 and 12 mm. in height. 



Occurrence. — Eomney Formation, Hamilton Member. East bank 

 Evitts Creek below Wolfe Mill; W. Va. side Potomac Eiver about 3 miles 

 south of Cumberland. 



Collections. — Maryland Geological Survey; New York State Museum; 

 American Museum of Natural History. 



Palaeoneilo MAXIMA (Conrad) (?) 

 Plate XXVI, Fig. 16 



Nuculites maxima Conrad, 1841, Geol. Surv. N. Y., An. Rep., p. 50. 

 TelUna (?) ovata Hall, 1843, Geol. N. Y., pt. iv, p. 196, fig. 6. 

 Palaeoneila maxima Hall, 1870, Prelim. Notice Lamellibranchiata 2, p. 9. 

 Palaeoneilo maxima Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamellibranchiata ii, 

 p. 335, pi. xlviii, figs. 29-38. 



Description. — "Shell large, ovate-acute; length one-half greater than 

 the height; basal margin very convex in the middle, curving regularly 

 to the anterior end ; posterior extremity narrow and abruptly rounded, or 

 subtruncate at the termination ; anterior end somewhat narrowly rounded ; 

 cardinal line declining rapidly on either side of the beak. Valves regu- 

 larly convex below, becoming gibbous in the middle and above; beaks 

 anterior to the center, prominent, small, with the apices very slightly 

 incurved; umbonal ridge distinct, subangular, extending to the upper side 

 of the posterior extremity; the furrow below is broad, obscure and unde- 

 fined. Surface marked by fine concentric striae, which are often very 

 obscure or obsolescent." Hall, 1885. 



A left valve of this species was obtained from the blue shales of Evitts 

 Creek below Wolfe Mill, which agrees closely with the above description ; 

 but the posterior constriction is rather sharper than on specimens of this 

 species in the office of the N. Y. State Paleontologist. The specimen was 

 shown Dr. J. M. Clarke who suggests that it be compared with both P. 



