C74 



Systematic Paleoxtologv — Upper Deyoxiax 



strong 2'oiniil nodes with a slialitly oblique direction or separated by 

 faintl}^ oblique grooves. These ornamental features give the upper part 

 of the whorl a flattened surface about the suture. They seem to have 

 8-10 of these strong nodes on the final whorl. Aperture large subovate 

 oblique, broadly rounded on tlie outer curve with the inferior margin 

 nearly direct to the base of the final wliorl. Of the two specimens of this 

 striking gastropod one represents the upper whorls only, the other ^Dre- 

 sents the profile with the characters of the body whorl and aperture. 

 Of the latter the entire height is 70 mm., width of body whorl -iO mm., 

 oblique diameter of aperture 35 mm. 



This is a very well-characterized species unlike anything known else- 

 where in the higher Devonian of the interior basin. In its size and the 

 nodes of the upper surface of the whorls it may be brought into com- 

 parison with the well-known shell Turbo shumardi Hall which is not 

 infrequently found in the Onondaga limestone of Indiana (see Hall, Pal. 

 N". Y., vol. V, pt. i, p. 165, pi. xxix, figs. 1-1) but this type of shell has not 

 been reported from other horizons. Though both of these may provision- 

 ally be left with the genus Turbo it is quite certain that on a revision of 

 the fossils referred to this genus these will be found to belong to another 

 group. 



Occurrence. — Jennings Formation, Chemung ^[e-aebei;. On the 

 National Road, 6 miles west of Frostburg. 



Collection. — Maryland Geological Survey. 



Family TROCHONEMAIDAE 



Genus TROCHONEMA Salter 



Trochonema (Gyronema) liratum (Hall) 

 Plate LXYIII, Fig. 13 



Cyclonema lirata Hall, 1801, Descriptions of New Species of Fossils, p. 19. 

 Cyclonema lirata Hall, 1862, 15th Rept. N. Y. State Cab. Nat. Hist., p. 47, 



pi. V, fig. 15. 

 Cyclonema lirata Hall, 1870, Illustrations Devonian Foss. Gastropoda, pi. xii. 

 Cyclonema lirata Hall, 1879, Pal. of N. Y., vol. v, pt. ii, p. 35, pi. xii, tigs. 



27-29. 

 (non Gyronema liratum Ulrich, 1897, Pal. Minn., p. 1056.) 



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