52 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Distribution. — Duplin Formatio7i. 2 miles below Lumberton, 

 Robeson County, North Carolina. Darlington, Darlington Coun- 

 ty; Muldrow's Place, 5 miles south east of Mayesville, Sumter 

 County, South Carolina. Waccamaw Formation. Mrs. Guion's 

 marl pit, Cape Fear River, Columbus County, North Carolina. 



Collections. — U. S. National Museum. Johns Hopkins Uni- 

 versity. The Academy of Natural Sciences of Philadelphia. 



Mulinia magnoliana Dall. Plate III, fig. 2. 



Spisula (Hemimactra ?) magnoliana Dall, 1898, Trans. Wagner Free Inst. 

 Sci. Philadelphia, vol. iii, pt. iv, p. 899, pi. xxvii, fig. 29. 



Original Description. — "Shell small, equilateral, somewhat com- 

 pressed, with small, little-elevated, pointed, adjacent beaks; sur- 

 face smooth except for lines of growth and a feeble angulation ex- 

 tending backward from the umbo to the lower posterior margin; 

 ends nearly equally rounded, the posterior slightly more pointed, 

 the base moderately and evenly curved; pallial sinus small, angular, 

 very short; hinge normal, feeble, with short, granulose laterals. 

 Lon. 17, alt. 11, diam. 7 mm." Dall, 1898. 



Type Locality. — Magnolia, Duplin County, North Carolina. 

 Duplin Formation. 



Observations. — In the unique valve, which was selected as the 

 type of Spisula magnoliana Dall, the cardinal margin has been 

 broken away, and the edges so perfectly rounded by erosion, 

 that all traces of the characteristic ligamentary attachment of 

 the Mulinia have been obliterated and replaced by a pseude- 

 Spisuloid attachment. This fact was established by the exam- 

 ination of fresh individuals in which the septum had been recently 

 chipped away. 



The subspecies is separated from the closely related protean con- 

 gesta by the lower, more regularly oval and elongate valves, the less 

 prominent umbones and the short, rather heavy laterals. 



Distribution. — *S^. Mary^s Formation. South Quay, Nansemond 

 County, Virginia. 3^ miles below Palmyra Bluff, Halifax County; 

 8 to 9 miles south of Greenville, Pitt County; 1 mile north of 

 Castoria, Greene County, North Carolina. Yorktown Formation. 

 Rock Landing, Craven County, North Carolina. Duplin Forma- 

 tion. 10 miles south of Clinton, Sampson County, Natural Well, 

 ^ mile north of Magnolia, Duplin County; 2 miles below Lumber- 

 ton, Robeson County, North Carolina. Muldrow's Place, 5 miles 

 southeast of Mayesville, Sumter County, South Carolina. Bruns- 



