71 6 CRETACEOUS PALEONTOLOGY. 



volutions, and incomplete at both the apex and the anterior 

 extremity, are : length, 5 1 mm. ; greatest diameter, 30 mm. ; 

 height of aperture, 21.5 mm.; width of aperture, 10.5 mm. If 

 this specimen were complete it would have an additional height 

 at the apex of about 20 mm., and an anterior beak about 30 mm. 

 in length. The outer lip of the aperture is produced and ter- 

 minates in two unequal pointed processes — one directed forward 

 and the other backward. Surface of the shell marked by a 

 rather strong, nodose, subangular, revolving keel at a little above 

 the mid-height of the outer volution. Upon the expanded portion 

 of the outer lip this keel curves upward tO' the posterior process 

 of the lip. Above and below the median keel the surface is 

 marked by moderately broad, rather depressed revolving ribs, 

 and by less conspicuous vertical markings. On the internal casts, 

 in which condition only the species has been seen in New Jersey, 

 the surface is marked in the younger individuals by more or 

 less indistinct revolving and vertical ribs, which evidently were 

 obliterated by the internal thickening of the shell, since the 

 larger individuals are all smooth. The aperture in the casts is 

 narrowly subelliptical in outline, the outer side being a little more 

 strongly curved than the inner. The columellar cavity left in 

 the casts is rather broad and is not marked by revolving folds. 



Remarks. — In New Jersey this species is known only in the 

 condition of internal casts, which are all imperfect, the apex of 

 the spire and the anterior rostral extension and the outer lip of 

 the aperture being lacking in every example observed. A care- 

 ful examination of the types of Whitfield's species Anchura 

 pagodaformis, Rostellaria, nohilis and Rostellaria 'hebe, leads to 

 the conclusion that all of them are members of the same species, 

 and a comparison of the specimens with numerous examples from 

 the South in the collections of the National Museum at Wash- 

 ington fails tO' show any characters by which they can be sepa- 

 rated from Anchura abrnpta. A part of the specimens described 

 by Whitfield as Turbinopsis major also seem tO' belong here. The 

 casts which Whitfield has identified as A. abrupta- and its variety 

 aadispira are also representatives of the saine species. These 

 internal casts differ more or less at different stages in their 



