8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



PANDORA (CLIDIOPHORA) CONRADI, new species 



Plate 5, figures 4, 5 



The specimen consists of attached valves, which have been slightly 

 compressed by the impact of incumbent sediments. 



Shell of medium size, subovate in form, thin, inequivalve, and 

 inequilateral, having a strong posteriorly protruding marginal ros- 

 trum. Anterior side proportionally rather long for the genus. 

 Anterior margin evenly and narrowly rounded ; basal margin broadly 

 rounded. Escutcheon extending nearly to the posterior extremity of 

 valves. Sculpture of fine, close, concentric lines and a few faint 

 diverging radials. 



Dmie7isions.—Tjpe (Cat. No. 352441, U.S.N.M.), greatest lati- 

 tude, 35 mm. ; altitude, 16 mm. ; diameter, 4 mm. 



Type locality. — U. S. G. S. station 1/221, near the bottom of a 

 small ravine entering Blackwater River and about a quarter of a mile 

 from it and about 1% miles northwest of Walters, Va. 



The new species here described differs from P. crassidens Conrad 

 in possessing a proportionally longer anterior side and a much 

 stronger and more protruding rostrum. 



Occurt'ence. — Yorktown formation, zone 2. Known only from 

 the type locality. 



CRASSATELLITES (CRASSATELLITES) MERIDIONALIS SURRYENSIS. new subspecies 



Plate 5, figures 3, 6 



Shell large, solid, ovate, and nearly equilateral, the posterior side 

 being somewhat longer. Outline of anterior, ventral, and posterior 

 margins rounded, the anterior margin slightly more broadly rounded 

 than the posterior. Posterior-dorsal angle obtuse, not ridged, in 

 front of which the disk is weakly Constricted. A weak radial is 

 halfway between the shoulder and the border of the escutcheon. 

 Lunule and escutcheon prominent and impressed, the escutcheon a 

 little longer, wider, and more curved than the lunule. Nepionic 

 shell slightly flattened and marked by about 10 moderately strong 

 concentric undulations continued on a radius of about 10 milli- 

 meters. The rest of the surface is nearly smooth. The hinge is 

 normal. 



Z^ime^OTi^.— Type— left valve (Cat. No. 370832, U.S.N.M.), 

 latitude, 93 mm.; altitude, 70 mm.; diameter (1 valve), 18 mm. 



Dall ^ placed tneridionalis as a variety of Crassetellites melinus 

 (Conrad). I have raised his variety to specific rank. The new 

 subspecies is a higher and more equilateral shell than the species 



'Dall, W. H., Wagner Free Inst. Sci. Trans., vol. 3, pt. 6, p. 1473, pi. 37, flgs. 6, 13, 

 1903. 



