MARYLAND GEOLOGICAL SURVEY 685 



umbones at rather a small angle; the posterior cardinal also thin and 

 laminar, finely bifid, much elongated and set close under the nymph to 

 which it is approximately parallel ; anterior cardinal of left valve thin and 

 laminar, but quite prominent, fitting between the anterior and middle 

 cardinals of the right valve ; the middle and posterior cardinals of the left 

 valve laminar and elongated, the posterior more produced and narrowly 

 sulcate, both of them placed far back under the dorsal margin and diverg- 

 ing from one another and from the ligament nymph at a very small angle 

 in order that they may receive the posterior cardinal of the right valve ; 

 muscle impressions small, obscure; pallia! line running close to the 

 ventral margin; sinus short, broad, acutely angulated at its anterior 

 extremity. 



Occurrence. MATAWAX FORMATION. Three-quarters of a mile south- 

 west of Ulmstead Point, Anne Arundel County. MOXMOUTH FORMATION. 

 Freeman's Creek, Kent County ; Brightseat, Brooks estate near Seat Pleas- 

 ant, Friendly, McNeys Corners, 2 miles south of Oxon Hill, Prince 

 George's County. 



Collections. Maryland Geological Survey, Philadelphia Academy of 

 Xatural Sciences, New Jersey Geological Survey, U. S. National Museum. 



Outside Distribution. Matawan Formation. Merchantville clay marl, 

 Woodbury clay, Wenonah sand, New Jersey. Monmouth Formation. 

 Xavesink marl, Red Bank sand, New Jersey. Black Creek Formation. 

 North and South Carolina. Eutaw Formation (Tombigbee sand mem- 

 ber). Exogyra ponderosa zone, Mortoniceras subzone, Georgia. Ripley 

 Formation. Exogyra ponderosa zone, Barbour County, Alabama. Exo- 

 gyra costata zone, Schley County, Georgia ; Euf aula, Alabama ; Union and 

 Tippah counties, Mississippi. Extreme top of zone, Pataula Creek, 

 Georgia. Selma Formation. Exogyra costata zone, Wilcox County, Ala- 

 bama ; east-central Mississippi. 



LEGUMEN CAROLINENSE (Conrad) 



Baroda carolinensis Conrad, 1875, Kerr's Rept. Geol. Survey, North Caro- 

 lina, Appendix, pp. 8, 9, pi. ii, fig. 10. 



Description. " Shell oblong, very inequilateral, convex, with a few 

 slightly impressed concentric furrows; posterior cardinal margin long, 



