New Species of Devonian Fossils. 137 



Newherria ? condoni Hall, Tenth Ann. Rept. New York State 



Geologist, 1891, p. 95 (p. 7 of extract). 

 Megalanteris condoni Hall and Clarke, Pal. New York, vol. 8, 

 pt. n, 1893, p. 280. — Savage, Am. Jour. Sci. (4), vol. XXV, 

 1908, p. 437. 



Remarks: Although the exterior of this shell is well known, 

 its interior characters have not heretofore been described. The 

 sharp molds and casts of the species in the Camden chert clearly 

 show the characters of muscle-scars and cardinal process, and 

 one specimen preserves the loop entire. The cardinal process is 

 large and elevated, its posterior face forming an angle of about 

 45° with the plane of the valve. 



This surface bears a high, thin, vertical median ridge bounded 

 by deep, narrow muscular grooves. The cardinal process thus 

 closely resembles that of 0. lucerna (Maryland Geol. Surv., 

 Lower Devonian volume, pi. 6^, fig. 24). Because of this char- 

 acter, the species is here referred to the genus Oriskania. 



The loop closely resembles that of Beachia suessana. The 

 descending lamellae join to form a flat triangular plate which 

 makes the anterior part of the loop. This plate is broader and 

 shorter than in a similar specimen of B. suessana before the 

 writer, and the descending lamellae are more evenly arched so 

 that the outline of the loop is subcordate. The slender projec- 

 tion from the posterior edge of the triangular plate extends 

 almost to the ends of the crura. 



Occurrence: A very common shell in the Camden chert of 

 Tennessee and in the Clear Creek chert of southern Illinois. 



Megalanteris (?) saffordi, n. sp. 

 Plate III, figs. 14, 15 



Description: Externally resembling closely M. (f) ovalis both 

 as to size and contour, this species could scarcely be distinguished 

 from the latter except by interior characters. The sharp exter- 

 nal molds of the new species show distinct though low striations 

 over its surface which would help to distinguish it, the surface of 

 M. (f) ovalis being practically smooth. 



Internally the cardinal process is a little more highly special- 

 ized than that of M. (f) ovalis, the median ridge upon its 

 summit arising as a high vertical plate, more elevated than that 



