205 Midway STx\ge 91 



but it suffices to show that the species is present in the Mat- 

 thews' Landing horizon as far east as Dale's Branch, near Oak 

 Hill P. O. A ver}- large, perfect specimen from Wood's Bluff 

 is now being figured by Dr. McConnell of Washington. 



Type. — Aldrich's collection. 



Specimen figured. — Dale's Branch. 



STREPSIDURA. 



Strepsidiira heilprini^ PI. 9, fig. 3. 



Syn. 5*. heilprini Aid., Bull. Am. Pal., No. 2, 1895, P- ^2, 

 pi. 4, fig. I. 



Aldrich's original description. — "Shell short, stout; whorls nine, 

 first four smooth, embryonic, the fifth costate, the others with 

 about six profoundly raised and rounded transverse ribs; surface 

 reticulated, apex pointed; outer lip striated within; columella 

 twisted, bearing at the narrow part far within a single fold; 

 canal extremely twisted and turned upward at base. 



''Locality. — Matthews' Landing, Ala." 



Type. — T. H. Aldrich's collection. 



Our collection includes specimens from Matthews' Landing and 

 I mile west of Oak Hill P. O. 



Specimens of a different, though somewhat related species 

 were collected at Black Bluff, on the Tombigbee. 



Strepsidiiraf fjtediavia n. sp. , PI. 8, figs. 16, a, 17. 



Specific characterization. — Size and general form as indicated 

 by the figures; whorls probabl}^ about 6; spiral whorls orna- 

 mented by about 8 basal nodular ribs and about an equal num- 

 ber of revolving lines; body whorl showing 9 or 10 rounded ribs, 

 strongest on the carina, dying out above and becoming faint 

 below; spiral striation above the carina, distinct but much finer 

 than that below; lines of growth fine, swinging backward from 

 the suture to the carina, thence curving slightly forward again 

 and finally recurving, as in Levifusus; columella with a Fulg'ur- 

 like angle upon which are located one strong, very sharp, basal 

 plait and one less distinct, above. In old, large specimens the 

 columella is large and umbilicate. 



The general form of this species with its long anterior canal 

 not sharply reflected, and the presence of an umbilicus render 

 the reference of this species to Strepsidiira not certain; yet unless 

 a new genus is proposed we are at a loss to know where it can 

 better be placed. 



