'>T<> SYSTEirATic Paleoxtologv — Fppeu Devoxiax 



Genus EUOMPHALUS Sowerby 



EUOMPIIALUS TIOGA Hall 



Euomphalus tioga Hall, 1S79, Pal. N. Y., vol. v, pt. il, p. 56, pi. xxvil, fig. 8. 



Description. — " Shell discoid ; upper side moderately concave from the 

 dorso-lateral angle ; lower side broadly umbilicate, the dorso-basal margin 

 acutely angular. Periphery flattened, oblique to the plane of the shell, 

 and slopin<>' outwards from Uie upper margin. A^olutions probably three 

 or more, gradualiy enlarging from the apex; the remains of two only are 

 shown in the specimen figured, in which the extremity of the outer volution 

 is much wider than high. Aperture unknown; transverse section trian- 

 gular, with the inner angle truncated. Surface of the upper side and 

 periphery preserving the remains of strias, which bend abruptly backwards 

 at the lower carina. The specimen is essentially a cast of the interior, and 

 somewhat worn. The species is extremely similar to the E. decewi, with 

 more slender volutions, and the dorso-basal margin more acutely angular." 

 Hall, 1879. 



Diameter 140 mm. 



Occurrence. — Jexnixgs Formation, Chemung Member. Near Little 

 Orleans. 



Collection. — Maryland Geological Survey. 



Family TURBINIDAE 



Genus CYCLONEMA Hall 

 Cycloxema concinnum Hall 



Plate LXVII, Figs. 27-39 



Cyclonema concinna Hall, 1S76, Illustrations of Devonian Foss. Gastropoda, 



pi. xii. 

 Cyclonema concinna Hall, 1879, Pal. of N. Y., vol. v, pt. ii, p. 38, pi. xii, 



figs. 38-40. 



Description.- — Shell subglobose, conical ; apical angle large ; volutions 

 four or more in entire shells; last volution greatly enlarged, ventricose. 

 Surface of upper volutions bearing 3 to 4 delicate, revolving carime, two 

 of which are near upper suture; body volution bearing one or two deli- 



