108 PALEONTOLOGY OF NEW JERSEY. 



either of these genera, if the typical forms are considered, as they are to 

 Cifhara; therefore I have preferred to place them under this latter genus. 



Formation and locality : In dark green marl near the base of the Lower 

 Marls, at Crosswicks Creek, near New Egypt, New Jersey. Collected by 

 Dr. N. L. Britton. The casts are very hard, black, shining, and brittle. 



STROMBID^. 



Genus ROSTELLARIA Lamarck. 



Among the casts of gasteropoda from the Lower Marl Beds in New Jer- 

 sey, are several species which appear to belong to this genus, differing from 

 those referred to Ancliura in not presenting any evidence of a dorsal keel on 

 the outer half of the last volution or of spiral striae, and some of them even 

 not presenting evidence of vertical folds crossing the upper whorls.. Some 

 of these are perfect enough to be characterized, while many of them are 

 not. Some occur in numbers, while other forms are represented by only 

 single individuals. Among those distinct enough for characterization, and 

 represented by several individuals, I have considered the following forms 

 worthy of notice and description: 



RoSTELLARIA COMPACTA, n. Sp. 



Plate XIII, Figs. 18-^1. 



Shell of only a medium size or smaller, elongate ovate in form, as casts, 

 with a moderately elevated spire, the apical angle of which varies but little 

 from 30°; volutions four to five in number, quite compactly coiled and very 

 moderately convex between the sutures, presenting evidence of a rather 

 thin shell; body volution large, forming nearly or quite one-half of the 

 length of the cast; moderately convex on the upper part, but rapidly con- 

 tracted below, apparently having been provided with a rostral beak of some 

 length; outer part of last volution extended upward at the upper edge to 

 near the top of the next volution above, as distinctly indicated on one of 

 the casts; apertm'e, as shown on the cast, narrowly elliptical, acute above 

 and pointed below; columellar cavity left by the removal of the shell rather 

 small; surface of the cast smooth. 



