167 Midway Stage 53 



Localities. — Texas: ? 18 mi. S. E. of Eagle Pass; 4 mi. N. E. 

 of Kemp, Kaufman Co. 



Arkansas: Olsen's switch, Pulaski Co.; Johnson's 

 well, Ivittle Rock. 



Tennessee: Hannah's, Huddleston's and Middle- 

 ton, Hardeman Co. 



Mississippi: Reeve's; limestone Y^ mi. S. of Rip- 

 ley; Yz mi. N. of Ripley; i mi. E. of Ripley; 

 Blue Mt. , Tippah Co. 



Alabama: Basal Eocene bed about Prairie Bluff; 

 I mi. N. of Midway; 3 mi. N. E. of Snow Hill; 

 Palmers mill; Cole's place; S. McConnico's, i>^ 

 mi. S. W. of Palmer's mill; Josh Hunter's. 



PECTUNCULUS. 



Pedunculus, PI. 4, fig. 3. 



The Pedunaili of the Midway are not generally well preserved, 

 but as far as can be determined at present they all represent one 

 and the same species. Fragments somewhat eroded, though 

 showing occasional surface markings, indicate a closer affinity 

 with idoneus than with stamineus; the peculiar strong concentric 

 striae of the latter are wanting while the fine radiating striae are 

 present. The Midway species is seemingly the same as that 

 found in the Lignitic at Gregg's Ldg., hence we defer a more 

 minute description of it here. 



Localities. — TENNESSEE: 5 mi. S. of Crainesville. (Sp. fig'd.) 

 Alabama: 1% mi. S. W. of Palmer's mill, Wilcox 

 Co.; between Snow Hill and Allenton, at " Ham- 

 burg"; ^ mi. W. of Graveyard hill, Wilcox Co. 

 Georgia: Uppermost layer of the Midway at Ft. 

 Gaines. 



NUCULA. 



Nucula mediavia n. sp., PI. 4, fig. 4. 



Specific characterization. — Size and general form about as fig- 

 ured; surface showing besides lines of growth, many radiating 

 striae; lunule large, deeply depressed and sometimes traversed by 

 a faint radiating ridge; within, strongly crenulate at margin; pos- 

 terior as well as anterior row of teeth well developed, each tooth 

 angulate in the middle; angle formed at the junction of the two 

 rows of teeth about 130 degrees. 



