PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 151 



ones (about 24 on the body-wborl) ; two very distinct revolving lines on 

 the last volution, the upi>er one placed at about the middle, the lower 

 one subcariuating it (only the upper of these two lines is seen on the 

 remaining- whorls, appearing there as a central line) ; base striated by 

 revolving lines, and radially by the continuations of the transverse 

 lines ; apperture elliptical, somewhat i>roduced distally. 



Length, f inch. (No. 8920.) 



Jackson, Miss. 



FUSUS, Lam. 



Subgenus Steepsidura, Swainson. 



FuSUS MARNOCHI, n. Sp. 



Plate, fig. 6. 



Volutions seven or eight, the earlier three or four convex, the remain- 

 der flattened; body-whorl subangulate; suture impressed; aperture 

 less than one-half the length of shell, the canal sharply twisted ; col- 

 umella with a pseudo-fold following the curve of the canal. The whorls 

 in the single specimen before me are destitute of ornamentation, but 

 some traces of the former existence of revolving lines are apparent. 



Length, f inch. (No. 8917.) 



Atascosa County, Texas. 



Named after Mr. G. W. Maruoch, through whom this and other spe- 

 cies of older Tertiary Texas fossils have been obtained. 



TEREBEA, Lam. 

 Terebra plicifera, n. sp. 



Plate, fig. 8. 



Turreted; whorls ? in number, flattened, rapidly decreasing in size 

 from the base "upwards, and ornamented by numerous broad and prom- 

 inently defined plicie, having a sigmoidal flexure; an impressed line on 

 the ui)ijer portion of each volution produces a subsutural ring or band, 

 over which the plica? and ( orresponding sulci are continued, and which 

 occasionally tends to become double from the j)reseuce of a second im- 

 pressed line. Bodj'-whorl with two elevated revolving lines on its basal 

 angulation; base radiately and longitudinally striated; aperture? (bro- 

 ken in all specimens). 



Length? (No. 8919.) 



Atascosa County, Texas. 



CEASSATELLA, Lam. 

 Crassatella declivis, n. sp. 



Plate, fig. 9. 



Very inequilateral, somewhat inflated anteriorly, the posterior dorsal 

 margin descending very obliquely to the extremity, which is subcunei- 



