282 SYSTEiiATic Paleoxtology — Middle Devoxiax 



Subgenus GYROMA Oehlert 



Pleurotomaria (Gykoma) capillaria Conrad 



Plate XXXV, Figs. 6-8 



Pleurotomaria capillaria Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, 



p. 271, pi. xvi, fig. 11. 

 Pleurotomaria capillaria Hall, 18G2, Fifteenth Rep. N. Y. State Cab. Nat. 



Hist., p. 45, pi. V, fig. 2. 

 Pleurotomaria capillaria Hall, 1879, Pal. N. Y., vol. v, pt. ii, p. 77, pi. xx, 



figs. 18-21. 

 Pleurotomaria capillaria Clarke, 1903, N. Y. State Mus., Bull. 65, p. 555. 

 Gyroma capillaria Grabau and Shinier, 1909, N. Am. Index Fossils, vol. i, p. 



647, fig. 882. 



Description. — "Shell turreted, one-fourth to one-third higher than 

 wide; volutions four or more, somewhat rapidly increasing in size, the 

 last one ventricose, subangulated above by two or three prominent re- 

 volving carinae, and rounded on the lower side; aperture subrhomboidal. 

 Surface on the iipper side of the volutions marked by two or three re- 

 volving carinae, with finer intermediate ones or strong striae, and all are 

 crenulated by finer distant transverse striae ; lower side of volutions 

 marked by regular, strong, revolving cariniform striae, which are more 

 approximate as they approach the umbilical depression, and all crenulated 

 by concentric striae; peripheral band narrow and prominent, margins 

 carinate, and the intermediate space marked only by curving striae; 

 above and below the band, there is usually a broader smooth space than 

 between the cariniform striae." Hall, 1879. 



A few specimens were obtained, mostly from Evitts Creek below Wolfe 

 Mill, which possess the typical surface markings of this species. The 

 proportions of height and width are nearly equal on one specimen and 

 therefore do not agree with the above description, but the specimen is 

 som.ewhat shortened by pressure; while in a smaller one that is not 

 crushed the proportions are about normal. This species is recognized 

 most readily from its size, shape, and revolving striae which are never 

 equal, and are crenulated by the finer transverse striae. 



Length, shortened by crushing, 17, 14 mm.; width, 17, 10| mm. 



