Maryland Geological Survey 471 



A. Shell small or of average dimensions; whorls neither conspicuously 



convex nor conspicuously flattened; external surface sculptured 

 with 10 to 20 axial costse. 



1. Shell rarely exceeding 25 mm. in altitude; axials usually exceed- 



ing 15 in number on the later whorls Anchura rostrata 



2. Shell usually exceeding 25 mm. in altitude; axials rarely exceed- 



ing 15 in number on the later volutions Anchura pennata 



B. Shell large; whorls conspicuously convex; external sculpture not 



known Anchura hebe 



C. Shell small, very slender; whorls conspicuously flattened; external 



surface sculptured with numerous sigmoidal axial costae. 



Anchura pergracilis 



Anchura rostrata (Gabb) Meek 



Rostellaria rostrata Gabb, 1860, Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 



iv, p. 390, pi. lxviii, fig. 7. 

 Anchura (Drepanochilus) rostrata Meek, 1864, Check List Inv. Fossils, N. 



A., Cret. and Jur., p. 19. 

 Anchura rostrata Conrad, 1868, Cook's Geol. of New Jersey, p. 729. 

 Rostellaria rostrata Conrad, 1875, Kerr's Geol. Rept. of North Carolina. 



App., p. 12. (Not Anchura rostrata Conrad, Kerr's Geol. N. C, App. 



p. 12, pi. ii, fig. 28.) 

 Alaria rostrata Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 119, 



pi. xiv, figs. 5, 6. 

 Alaria rostrata Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 23. 

 Anchura rostrata Weller, 1907, Rept. Geol. Survey of New Jersey, vol. iv, 



p. 709, pi. lxxxi. figs. 7-9. 



Description. — " Fusiform, outer lip very much produced laterally ; 

 whorls six ; canal moderately long; surface marked by nodes on the angle 

 of the whorl, which are prolonged below into ribs extending over a large 

 portion of the whorl ; other markings ( ?) . Casts." — Gabb, 1860. 



Type Locality. — Burlington County, New Jersey. 



Shell exclusive of the expanded outer lip slender, fusiform ; whorls 

 eight to ten in number, those of the spire flattened or feebly convex, 

 increasing regularly in size; body whorl inflated, quite abruptly con- 

 stricted and acutely pointed anteriorly, external surface sculptured with 

 fifteen to twenty feebly arcuate axial costae which persist from suture 

 to suture on the earlier whorls but tend to evanesce posteriorly on later 

 volutions, subequal in size excepting for an occasional subvaricose costal, 

 and approximately uniform in spacing; suture lines closely appressed, 

 minutely undulated by the costae of the preceding volution; aperture 

 rather wide, subquadrate; outer lip widely alate. produced backward 



