MAKNNANI) (i lOO l.i »( 1 1 ( \ I, SlUVI-V } ^)3 



line, llic Iniiiili wilh st rinl inns mi ihc ii|i|)cr liaH', iIh- lower hall' hc-'iiif^ 

 siiiiiiiili, llic lil'ili ;iihI sixlli (lindy) \\ Imrls siiiDiitli. ('\cc|ii for very faint, 

 rcvoh iiiu' liiii's. wliiili ;ii(' less (listiiicl lliaii the lines ol' j^rowtli. ami 

 alioiil ('iL^lit. sli;ir|i, i-c\ ol\ iiii:; lines aroiiml ilir ninliiliciis; callosity on 

 the lahiiiin lliiii; iiiiihilieLi.s niuderatu; nioiitli lai';;c; coluniella concave 

 above. 



Lenut li, S nun.: wiilt li, I inin. 



Occurrence. — Aquia I'okm viiox. 2 miles below Potomac Creek. 



Collection. — Marylaml ( icolou-ienl Survey. 



Superfamilv PTENOGLOSSA. 

 Family SOLARIIDAE. 



Genus SOLARIUM Lamnrck. 



Solarium sp. 

 Plate XXVIII, Figs. 7, 7a. 



iSolciriinn .yj. Clark, 189.5, Johns Ihiiikiiis Univ. Circ, vol. xv, p. .5. 



SoJarhun sp. Clark, 180(3, Bull. 141, U. S. Geol. Survey, \k 71, pi. xiv, tigs. 4a, 4b. 



Xo new material belonging to this genus has been obtained except an 

 indeterminate fragment from near Mason Springs. ISTeither this, nor 

 the cast from Aqnia Creek, give any clew to the specific characters. 



Length. G mm.; width. 16 mm. 



Occurrence. — Aquia Foematiox. Aqnia Creek, 1 mile southeast of 

 Mason Springs. 



Collect io)i. — Johns Hopkins University. ]^Iaryland Geological Survey. 



Family SCALARllDAE. 



Genus SCALA Klein. 



SCALA YIEGIXIAXA Clark. 



Plate XXYIII. Figs. S, 8a, 9, 9a. 



Scala ivrginiana Clark, 18V).5, Johns Hopkins Univ. Circ, vol. xv, p. 4. 



Scala virginiaiia Clark, 1896, Bull. 141, U. S. Geol. Survey, p. 71, pi. xiv, figs. "«, Sb. 



Description. — "' Shell probably seven- or eight- whorled; surface cov- 

 ered with a uniform, fine, spiral striation; varices fifteen to the whorl. 



