MARYLAND GEOLOGICAL SURVEY 189 



As is stated below (p. 191) the forms here and by Dall referred to 

 P. altilis possibly are normal forms of the species figured by Say as 

 Buccinum porcinum and Buccinum aratuni. This possibility is sug- 

 gested by the fact that Say's species have never since then been found 

 at the St. Mary's Eiver, while the forms here figured, which are by no 

 means rare, were not distinguished by the early workers. 



Length, 30 mm.; diameter, 18 mm. 



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



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, Cornell University, U. S. jSTational Museum. 



Ptychosalpins multirugata Conrad. 

 Plate XLVIII, Fig. 6. 



Bnccinwii mnltirnyatnm Conrad, 1841, Amer. Jour. Sci, voL xli, p. 34.5. 

 Tritia multirngata Conrad, 1863, Proc. Acad. Nat. Sci. Phila., voL xiv, p. 563. 

 Tritia multirucjata Meek, 1864, Miocene Check List, Smith. Misc. CoU. (183), p. 20. 

 Ptychosalpinx mullirugata Gill, 1867, Amer. Jour. Couch., vol. iii, p. 154. 

 Ptychoaalpinx multirngata Conrad, 1868, Amer. Jour. Conch., vol. iii, p. 263. 

 Ptychosalpinx multirufiata Dall, 1893, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, 



p. 237. 

 Cominella (Ptychosalpinx) miiltinifjata Cossmann, 1901, Essais de Palcoconch. Comp., 



vol. Iv, ]). 151. 



Description. — " Ovato-conical, with numerous wrinkled spiral lines, 

 coarser and more distant near the suture and at base of the body whirl ; 

 base bicarinated and subumbilicated ; columella with a thick fold at base." 

 Conrad, 1841. 



This is the rarest species of Ptychosalpinx from the Maryland Miocene. 

 When more material is collected it will probably be found to grade into 

 the lienosa-fossulata series. 



Length, 36 mm. ; diameter, 22 mm. 



Occurrence. — Choptank Formation. Dover Bridge. Calvert For- 

 mation. Plum Point. 



Collection. — U. S. National Museum. 



Ptychosalpinx lienosa Conrad. 

 Plate XLVIII, Fig. 7. 



Buccinum lienosum Conrad, 1843, Proc. Acad. Nat. Sci. Phila., vol. i, p. 308. 

 Bucciiium bilix Conrad, 1843, Proc. Acad. Nat. Sci. Phila., vol. i, p. 308. (In part). 

 Buccinum fossulatum Conrad, 1843, Proc. Acad. Nat. Sci. Phila., vol. i, p. 308. 

 Tritia fossulata Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. .562. 

 Tritia fossulata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 20. 



