MARYLAND GEOLOGICAL SURVEY 157 



" Turriciilate, whorls 6, scalariform, with distant obtuse ribs on the 

 lower half; sntnre waved, with an impressed line above it; body whorl 

 with an impressed revolving line above and four raised revolving lines 

 inferiorly; upper sinus of labrum deep and rounded, lower obselete." 

 Conrad, 1862. 



The outline is very variable as the figures show. 



Length, 20 mm.; diameter, 8 mm. Length, 15 mm.; diameter, 4 mm. 



Occurrence.—ST. Mary's Formatiox. St. Mary's Eiver. 



ColUdions.— Maryland Geological Survey, Johns Hopkins University, 

 Philadelphia Academy of Natural Sciences, Cornell University. 



Drillia whitfieldi n. sp. 

 Plate XLII, Fig. 10. 



Brillia elegans Whitfield, 18'.»4, Mon. xxiv, U. S. GeoL Survey, p. 115, pi. xxi, tigs. 



2-4. 

 Not rieurotoma elegans Emmons. 



Description.—'' The features described by the author * are, perhaps, a 

 little more pronounced on the New Jersey specimens than they would 

 appear to have been on the specimens which he figures, while the line 

 of nodes occun-ing above the sinus constriction are neither figured nor 

 mentioned. Still, a species constructed according to his figure and de- 

 scription would scarcely fail to possess them. On the New Jersey 

 specimens they are very conspicuous, while in all other features the 

 specimens correspond well. 



'■■ There is much variation among the different individuals before me, 

 especially in the comparative increase in the diameter of the shell in 

 proportion, to its length, to the amount of nearly or quite one-fourth of 

 the whole diameter; also in the proportional strength and size of the 

 nodes above the sutural band and in the strength of the spiral lines. 



" The aperture of the shell is narrow and elongated and equal to more 

 than one-third of the entire length of the shell. The outer lip appears 

 to have been thickened, although all the specimens are too imperfect 

 for positive statement. The inner lip has a decided callus at its upper 

 end, while the notch is distiiict but not deep. The longitudinal plicae 



* Whitfield refers to Emmons. 



