Makylaxd Geological Survey 293 



clonemas : " We have not had an opportunity to exaniine any oi' the 

 Devonian species that are referred to Cyclonema by various authors, but 

 judging from the literature alone we foel satisfied that not one has a 

 sufficient right to maintain its position in the genus." ' 



Length, 26 mm.; width, 22 mm. 



Occurrence. — Eomney Formation, Hamilton Member. W. Va. 

 bank of Potomac Eivcr -1- miles below Cumberland. 



Collection. — Maryland Geological Survey. 



Naticopsis sp. 

 Plate XXXYI, Fig. 11 



Katicopsis sp. undet. Kindle, 1912, BulL U. S. Geol. Survey, No. 50S, p. 98, 

 pL viii, fig. 11. 



Description. — " Casts of a small species of Xaticopsis of undetermined 

 identity occur in the dark shale at some localities." Kindle, 1912. 



Occurrence. — Eomney Formation, Oxo^"DAffA Member. Williams 

 Eoad 314 miles east of Cumberland. 



Collection. — U. S. National Museum. 



Order CTENOBRANCHIATA 



Suborder PLATYOPODA 



Superfamily GYMNOGLOSSA 



Family PYRAMIDELLIDAE 



Genus MACROCHILUS Phillips 



Macrochilus iiamiltoniae Hall 

 Plate XXXYI, Figs. 12-15 



Macrochilus hamiltoniae Hall, ISGl, Descriptions of New Species of Fossils, 



etc., p. 21. 

 Macrochilus hamiltoniae Hall, 1862, Fifteenth Rep. N. Y. State Cab. Nat. 



Hist., p. 49, pi. iv, fig. 2. 

 Macrochilus hamiltoniae Hall, 1879, Pal. N. Y., vol. v, pt. ii, p. 33, pi. xii, 



figs. 8-14. 



' Geol. of Minn., vol. iii, pt. ii, 1897, p. 1058. 



