304 Sysxe.matic Pali^oxtology — Middle Devoxiax 



Length of preserved portion, 25 mm.; width, toward mouth, 3 mm. 

 Occurrence. — Eomney Pokmatiojj, Hamilton Member. JilcC'oys 

 Ferr}'; southwest of McCoys Ferry. 



Collection. — ]\Iaryland Geological Survey. 



Family CONULARIIDAE 



Genus CONULARIA Miller 

 CoxuLARiA cf. UXDULATA Conrad 



Hate XXXVIII, Fig. 4 



Conularia undulaia Conrad, 1841, 5th An. Rep. Pal. of N. Y., p. 57. 

 Conularia undulata Conrad, 1861, Hall: Descriptions of New Species of 



Fossils, etc., p. 34. 

 Conularia undulata Conrad, 1S62, Hall: 15tli An. Rep. N. Y. State Cab. Nat. 



Hist., p. 62. 

 Conularia undxilata Conrad, 1876, Hall: Illustrations of Devonian Fossils: 



Pteropoda, pi. 5. 



Description. — Form elongate-pyramidal, with a quadrangular base. 

 Transverse section quadrangular, rhomboidal, with the faces subequal 

 (equal ?) ; angles indented by the longitudinal grooves. Faces of the 

 pyramid slightly convex in well preserved specimens, often entirely flat, 

 or sometimes concave, the proportions modified from pressure ; center of 

 each face marked by a distinct shallow groove, along which there is a 

 slight deflection of the transverse striae. Angles of the pyramid furrowed 

 by a strongly marked groove, which is conspicuous in all conditions of the 

 shell, and traversed by the surface-markings. Aperture of the fossil 

 unknown. Summit truncated by a convex septum in the best preserved 

 specimens. Shell extremely thin ; in most of the specimens entirely 

 dissolved. 



Surface, as deteniiined from the best preserved specimens, and from 

 external moulds, marked by fine transverse striae, which, upon the sides, 

 are gentle curving towards the aperture, and slightly recurved in crossing 

 the median groove, the striae are interrupted bv minute ^lustulose eleva- 

 tions, which give the surface, as seen under a strong lens, in its usual 

 condition of preservation, a minutely crenulate or pustulose aspect. 

 These elevations do not extend to the narrow interstriate spaces, which 



