MAUYLAND GEOLOGICAL SURVEY 165 



Length, 13 mm.; diameter, 8 mm. 



Occurrence. — Calvert Formation. Plum Point. 



Collection. — Maryland Geological Sun-ey. 



Suhgeniis ADMETE Moller. 



Cancellaria (Admete) makylandica n. sp. 

 Plate XLIII, Fig. 8. 



Description. — Shell small, slender, subfusiform, fragile, five-whorled; 

 whorls convex and somewhat angular in the middle; body whorl with 

 fourteen weak longitudinal ribs perpendicular to the suture, and with 

 numerous raised spiral striae which have a tendency to alternate in size; 

 mouth less than half the length of the shell; columella plaits small, 

 especially at the mouth. 



Length, 10 mm.; diameter, 5 mm. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Wagner Free Institute of Science. 



Subgenus TRIGONOSTOMA Blainville. 



Cancellaria (Trigonostoma) perspectiva Conrad. 

 Plate XLIII, Fig. 9. 



Cancellaria perspectiva Conrad, 1834, Jour. Acad. Nat. Sci. Phila., voL vii, 1st ser., 



p. 136. 

 Cancellaria perspectiva Hodge, 1841, Amer. Jour. Sci., vol. xli, p. 343. 

 Cancellaria perspectiva Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 567. 

 Cancellaria perspectiva Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), 



p. 17. 

 Cancellaria perspectiva Conrad, 1866, Amer. Jour. Conch., vol. ii, p. 67, pi. iii, 



fig. 6. 



Description. — " Shell subglobose, with irregular oblique prominent 

 distant ribs, and obtuse prominent spiral lines, alternated in size; spire 

 very short, conical; whorls profoundly channeled above; aperture obo- 

 vate, rather more than half the length of the shell; labrum striated 

 within; columella with three compressed plaits; the superior one very 

 prominent; umbilicus wide, striated within; exhibiting the volutions 

 to the apex." Conrad, 1834. 



