8 BUI.I.ETIN 2, ( 6o ) 



This species resembles superficially Pleurotoma servata Con. 

 from the Vicksburg beds. 



Pleiirotoma silicata, nov. sp. PI. 3, fig. 3. 



Shell fusiform ; whorls rounded, nine to ten, the first three 

 embrionic ones smooth, the next four plicate, a few spirals on the 

 upper part of these whorls just below the suture ; spiral lines 

 nearly obsolete on the last three whorls ; whorls rounded, upper 

 part of the body whorl constricted and all the whorls showing 

 this feature in a diminishing degree. The body whorl has nu- 

 merous fine spiral lines becoming more numerous and distinct 

 towards the base. Aperture linear, expanding slightly below ; 

 outer lip acute, excisum large. 



Locality. — Gregg's L<anding, Ala. 



The surface of the shell looks smooth and shining to the eye 

 and the shell very strongly fusiform. 



Pleurotoma lajigdoni, nov. sp. PI. 3, fig. 5. 



This species has been identified with the European P. acumiiia- 

 ta Sow. by Prof. Heilprin. I give X the above name provisiotial- 

 1}^ as the iFo reign forms seem to me to be distinct. The shell has 

 about thirteen whorls, the first four smooth, the balance with a 

 raised beaded band at the suture followed by the fasciolar space 

 showing lines of growth ; periphery of the whorls carrying tuber- 

 cles rising obliquely from the lower half of the same and strong- 

 est at termination ; spiral lines numerous, close set, somewhat 

 beaded on the body whorl. 



Locality. — Hatchetigbee Bluff ; also at Wood's Bluff, Ala. 



BORSONIA. 

 Borsonia {Scobi7iella) conradiana, nov, sp. PI. i, fig. 13. 



Shell small, rather solid, spirally ribbed, ribs beaded ; whorls 

 seven to eight ; aperture narrow ; outer lip crenulated within ; pil- 

 lar lip with four strong plaits, the last one oblique to the other 

 three. 



Locality. — Wheelock, Texas. 



This species has the same ornamentation as the young of Sc. 

 ccelata Con. but the plaits on the pillar lip are different. Gabb's 

 type of kS. crassiplicata is a very young shell and seems to equal 

 5". ccelata Con. 



Bo7'-sonia ple7tta 'Kax . & Aid. PI. i, fig. 12. 



Mr. Gilbert D. Harris has just published this species under our 



