MARYLAND GEOLOGICAL SURVEY 329 



Description. Shell strongly curved and laterally compressed, increas- 

 ing moderately in dimension with the length. Cross-section ovate, some- 

 what more than three-fifths as wide as long, with the widest part within 

 the median line and the narrowest at the dorsmn, which is narrowly 

 rounded. Septa deeply concave, somewhat numerous and closely spaced, 

 12 of the chambers near the outer part on the dorsal edge occurring in 

 25 mm. Siphon small and in contact with the shell at the dorsal margin. 

 Living chamber comparatively long and apparently not constricted near 

 the aperture. Surface of the shell without ornamentation and moderately 

 thick. 



Occurrence. BEEKMANTOWN LIMESTONE (Stonehenge member). 

 South of Funkstown, Maryland. Tribes Hill limestone of New York. 



Collection. U. S. National Museum. 



Genus GYRTOGERAS Goldfuss 



CYRTOCERAS GRACILE Cleland 



Plate XXXII, Figs. 3, 4 



Cyrtoceras sp. Cleland, 1900, Bull. Amer. Pal., vol. iii, p. 19, pi. xvii, 



figs. 5, 6. 

 Cyrtoceras gracilis Cleland, 1903, Bull. Amer. Pal., vol. iv, p. 13, pi. iii, 



fig. 11. 

 Cyrtoceras sp. Weller, 1903, Pal. New Jersey, vol. iii, p. 131, pi. v, figs. 7, 8. 



Description. Shell small, 12 mm. long and 8 mm. in diameter, slender, 

 arcuate, oval in transverse section. Siphuncle small and placed near the 

 ventral edge. Septa smooth, slightly concave, close together, with five 

 to six occurring in 4 mm. 



The shape and small size of this cephalopod and the closely arranged 

 septa will distinguish it from other Canadian species. 



The species was based upon specimens from the Tribes Hill limestone 

 at Fort Hunter, Tribes Hill, and Canajoharie, New York. The same or a 

 very similar species occurs in the Canadian portion of the Kittatinny 

 limestone at Columbia, New Jersey. 



In Maryland, natural longitudinal and cross-sections of apparently the 

 same species have been noted on the weathered surface of the lower Stone- 

 henge limestone. 



