232 Systematic Paleontology — Middle Devonian 



by very fine concentric striae, which are sometimes slightly fasciculate on 

 the lower portion of the shell; hinge furnished with numerous transverse 

 teeth. 



This species is common in the Hamilton shales of Maryland and is 

 represented by various forms from the short young specimens up to the 

 adult ones of normal size and shape as well as by some very elongated 

 specimens due to crushing. Hall reported this species from the Hamilton 

 formation at Pattersons Creek, [W.] Va. (Pal. N. Y., vol v, pt. i, Lamel- 

 libranchiata, ii, p. 325) and on pi. xlvii, figs. 7, 11 and 12 are stated to 

 be from the Hamilton group, near Cumberland, Md. This species is 

 readily recognized from its elongate ovate outline, widest at the anterior 

 end, and by the strong vertical clavicle in the interior of the shell or its 

 impression in the internal mould. 



Length, 10-23 mm.; height, 5-11 mm. One elongated specimen is 

 33 mm. in length. 



Occurrence. — Romney Foemation, Hamilton Member. East bank 

 Evitts Creek below Wolfe Mill ; Williams Road \ mile east of Queen City 

 Hotel, Cumberland; on National Road ^ mile west of Tonoloway Ridge; 

 on Oldtown Road east of Maryland Ave., Cumberland; McCoys Ferry; 

 southwest of McCo3's Ferry; Ernstville; on ISTational Road northeast of 

 Cumberland; along Flintstone Creek in Gilpin; west of iron bridge over 

 Town Creek northeast of Oldtown; W. Va. side Potomac River 4 miles 

 south of Cumberland; hill 3 miles south of Cumberland. 



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

 American Museum of Natural History. 



Nuculites triqueter Conrad 

 Plate XXYI, Figs. 1-5 



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

 Nuculites triqueter Hall, 1870, Prelim. Notice Lamellibranchiata 2, p. 4. 

 Nuculites triqueter Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamellibranchiata, li, 



p. 326, pi. xlvii, figs. 17-28; pi. xciii, figs. 8-10. 

 Nuculites triqueter Clarke, 1903, N. Y. State Mus., Bull. 65, p. 466. 

 Nuculites triqueter Grabau and Shimer, 1909, N. Am. Index Fossils, vol. i, 



p. 398, figs. 509d-f. 



