IIi:i.i)i:i;i5i;k(; I-'okmaiiox in Makvi.anu 45 



This species differs from Bellerophon aunculatus in its more rapirlly 

 expanding volutions and distinct dorsal carina. 

 Diameter of shell 1.4 cm. ; of aperture 1.5 cm. 



Occurrence. — Helderberg Formation, Keyser Member. Cash Valley. 

 Collection. — U. S. National Museum. 



Order CTENOBRANCHl ATA 



Suborder PLATYPODA 



Superfamily GYMNOGLOSSA 



Family PYRAMIDELLIDAE 



Genus LOXONEMA Phillips 

 LOXONEMA sp. 



Plate LXXIX, Fig. 8 



Descnption. — Pyramidal, apical angle small; volutions convex, their 

 height about two-thirds of their diameter. Sutures straight, moderately 

 deep. Surface ornamentation unknown. 



Length 25 mm. ; diameter of largest volution 9 mm. 



The generic relations of this species are unknown. It differs from 

 Loxonema fitchi in its less oblique volutions. It resembles Loxonerna sp. 

 described by Weller ' from the Decker Ferry of ISTew Jersey. 



Occurrence. — Helderberg For:mation, Keyser Member. Cash Valley. 



Collection. — Maryland Geological Survey. 



Superfamily TAENIOGLOSSA 

 Family LITTORINIDAE 



Genus PLATYCERAS Conrad 



Platyceras texuiliratum Hall? 

 Plate LXXXV, Figs. 1, 3 



Platyceras tenuiliratum Hall, 1859, Nat. Hist. N. Y., Pal., vol. lii, p. 317, pi. 

 Iviii, figs. 1-5; and pi. lix, figs. 6a, b, 1861. 



Description. — " Shell small, depressed, subovoid or subdiscoid, witli tlie 



last volution very ventricose. Spire slightly raised above the plane of the 



*Pal. N. J., vol. iii, 1903, pi. xxii, fig. 11. 



