217 Midway Stage io3 



P. multangnlata Heilp., Proc. Ac. Nat. Sci., Phila., 



1886, p. 374, P^- 20, fig. 2. 

 f P. tricostata Heilp., non Desh., ibid., p. 374, pi. 20, 



fig. 6. 

 /^. ;wz'^;^w Aid., Geol. Surv. Ala., 1886, p. 25, pi. 6, 



fig. 8. 

 Pyrula sp. . Har. , Geol. Surv. Ark., vol. 11, 1890, p. 46, 



pl. 3. %• 3- 



Whitfield's original description.— ''Sh&W small and fragile; 

 spire elevated; columella slender, slightly bent; aperture large, 

 elongate, ovate or subelliptical ; volutions three, marked on the 

 periphery by three distinct carinae or subangular revolvmg ridges, 

 the upper, one marked with closely arranged longitudinally elon- 

 gate nodes, the others simple; entire surface marked by very fine 

 revolving lines, which are somewhat fasciculate below the lower 

 carina, there being three finer ones between each large one. 



''Dimensions.— hQ.ng\h .6 inch, transverse diameter a little less 

 than .3 inch. 



"Z^m/zVj/.— Six miles above Claiborne, Alabama, west side of 

 river. ' ' 



This species is remarkable for its variability. Two forms are 

 shown by the figures. Whitfield's specimen had but three 

 carinas, while the Midway specimens often have four and a trace 

 of a fifth; one or two of the apical whorls smooth, the third passing 

 from obliquely costate to bicarinate, the fourth strqngly bicannate, 

 the carinas crenulate. Obscure oblique ribbing is often seen con- 

 necting the nodes on the two carinas. 



Localities— K-KJLK^SKS: Near Olsen's switch, a few miles S. W. 

 of Little Rock. See Ann'l Rep't Geol. Surv. 



Ark., vol. ii, pl. 3, fig- 3- . • .,, . r^ 1 



Alabama: Matthews' Landing; i mi. W. of Uak 

 Hill; y2 mi. W. of Graveyard hill. 



CYPR^A. 



CyprcBa sp. 



We have encountered two species of this genus in the Midway 

 stage One, a small, smooth species like the Jackson specimens 

 was found % mile north of Ripley, Miss. The other, a small, 

 reticulated species like C. lintea Con., was obtained from the 

 uppermost Midway limestone as it crops out at Ft. Gaines on 

 the Chattahoochee. Neither are sufficiently well preserved to 

 merit figuring or further description. 



