644 Systematic Paleoxtologv — Upper Devoxiax 



Occurrence. — Jennings For:matiox, Woodmont ^Membek, Ithaca 

 Fauna. Woodmont, 1067. 



Collection. — Marvlaiid Geological Survey. 



Genus PTYCHOPTERIA Hall 



Ptychopteria sp. 



Description. — A single specimen has been observed, which is too poor 

 to permit specific identification. 



Occurrence. — Jennings Formation, Woodmont ]\Iember, Ithaca 

 Fauna. Woodmont about 1000 feet altitude. 



Collection. — Maryland Geological Survey. 



Family MYALINIDAE 



Genus F'TYCHODESMA Hall and Whitfield 



Ptychodesma sp. 



Description. — A single specimen has been observed which is probably of 

 this genus. 



Occurrence. — Jennings Formation, Parkhead Member. Williams 

 Road, east of Cumberland, 1393. 



Collection. — Maryland Geological Survey. 



Superfamily TRIGONIACEA 



Family TRIGONIIDAE 



Genus SCHIZODUS King 



ScHizoDus ciiemungensis (Conrad) ? 



Plate LXIV, Figs. 3-5 



Nuculites Chemung en sis Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, 



p. 247, pi. xiii, fig. 13. 

 ScMzodus chemungensis Hall, 1885, pal. of N. Y., vol. v, pt. i, sec. ii, p. 453, 



pi. Ixxv, figs. 37-40, 45, 41?. 

 Schizodus chemungensis Grabau and Shinier, 1909, N. Amer. Index Foss., 



vol. i, p. 482, fig. 642. 



Description. — "Shell hii-ge. rhomboidal-ovate; length one-fourth 

 greater Ihan the height, .\nierior margin broadlv rounded, eurvino- into 



