MARYLAND GEOLOGICAL SURVEY 213 



SCALA MARYLANDIOA n. Sp. 



Plate LIII, Fig. 3. 



Scalaria mnltistriata Whitfield, 1894, Mod. xxiv, U. S. GeoL Survey, p. 126, pi. 

 xxiii, fig. 5. Not Scalaria nmltistriata Say. 



Description. — Shell small^ smooth, moderately slender, eight-whorled, 

 regularly conical ; whorls round, firmly in contact but with a deep suture ; 

 varices 12 to 18 in number on the body whorl, slightly carinated, each 

 made up of 4 lamellge ; mouth round or slisrhtlv ellintical : nucleus smooth, 

 elevated, three-whorled. 



This species differs from B. multistriata Say in being destitute of spiral 

 sculpture ; from S. sayana in having more varices, in being smaller, and 

 in having a rounder mouth ; and from S. teres in having fewer varices and 

 in being less elongate. 



Length, 10 mm. ; diameter, 4 mm. 



Occurrence. — Choptank Formation. Jones Wharf, Greensboro, 

 Dover Bridge, Cordova, Trappe Landing, 2 miles south of Governor Run, 

 Turner. Calvert Formation. Plum Point, Chesapeake Beach, 2 miles 

 south of Chesapeake Beach, Church Hill. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Cornell University, LT. S. National Museum. 



Subgenus OPALIA Adams. 



Scala (Opalia) calvertensis n. sp. 

 Plate LIII, Fig. 4. 



Description. — Shell solid, elongated, many-whorled ; whorls very eon- 

 vex, covered with fine revolving lines; varices about ten on each whorl; 

 very broad and closely set, somewhat carinated, covered with very fine 

 impressed longitudinal lines which appear to break up its surface into 

 laminae; intervarical spaces very narrow so that the spiral lines are fre- 

 quently hidden; base with a spiral cord and axial fascicle as on S. De 

 Bouryi Dall ; mouth round. 



Length (of two-whorled fragment), 19 mm.; diameter, 12 mm. 



Occurrence. — Calvert Formation. Plum Point, 3 miles south of 

 Chesapeake Beach. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



