Makylaxd (ii;()i.()(ii('AL SriiVKY 661 



Class GASTROPODA 



Subclass STREPTONEURA 

 Order ASPI DOBRANCHI A 



Suborder RHIPIDOGLOSSA 

 Family PLEUROTOMARIIDAE 



Genus PLEUROTOMARIA Defrance 

 Pleukotoj[aria ((Jyuo.ma) capillakma Conrad 



Plate LXA^II, Figs. 1-3 



Pleurotonmria capillnria Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. 



viii, p. 271, pi. xvi, fig. ii. 

 Pleiirotomaria capillaria Hall, 1861, Description of New Species of Fossils, 



p. 17. 

 Pleurotomaria capillaria Hall, 1862, 1.5th Kept. N. Y. State Cab. Nat. Hist., 



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

 Pleurotomaria capillaria Hall, 1876, Illus. Devonian Foss. Gastropoda, p. 20. 

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



flgs. 18-21. 

 Gyroma capillaria Perner, 1907, Syst. Sil. Boheme, vol. iv, th. ii, p. 25. 

 Oyroma capillaria Grabau and Shimer, 1909, Index Foss. N. Amer., vol. i, p. 



647, fig. 882. 



Descripiiuii. — ■'Shell tiirreted, mie-rointh to one-tlni'd higiier Hum wide. 

 Yohitions four or more, somewhat rapidly increasing' in size, the last 

 one ventricose, suhangnlated above by two or lliree pr(ninnent n'volving 

 carina% and ronnded on the lower side. .Vjieilure subrliomboidal. Sur- 

 face on the tipper side of the volulions marked by two or three revolving 

 cariniv, with finer iiitennediate ones on strong slri;v, and all are erenn- 

 lated by finer distant transverse stria?; lower side of volutions marked by 

 regular, strong, revolving cariniform striae, winch are more apjjroximate 

 as they approach the innbilical depression, and all crenulated by con- 

 centric striae. Peripheral hand iiariow and prominent, margins carinate. 

 and the iidermediate space marked oidy by curving stria". Above and 

 below the band there is usually a broader smooth space than between the 

 cariniform stria'. In some specimens the transverse striae arc con- 

 spicuous only in crossing the revolving stria^ while in others they are 



