54 



THE NAUTILUS. 



Terebra dislocata Say. . . 1 

 Terebra protexta Conr. . . 20 

 Conns pealii Green .... 95 

 Drillia leucocyma Ball. . . 10 



Drillia thea Ball 20 



Mangilia biconica C. B. Ads. 85 

 Mangilia stellata Slearns . 65 

 Mangilia cerinella Dall . . 25 

 Oliva literata Lam. ... 6 

 Olivella mutica Say . . . 1450 

 Olivella floralia Duel ... 12 

 Olivella bnllula Reeve 



(young) 60 



Marginella aureocincta 



Stearns 150 



Marginella apicina Menke . 630 

 Marginella denticulata var. 



opalina Stearns .... 54 



110 



296 



338 



4 



5 



7 



120 



2 



23 



Vermicularia spirata Phil . 

 Litorina angulilera Lam. . 

 Rissoina chesnelii Michaud, 

 Crepidula fornicata L. . . 

 Crepidula plana Say . . . 

 Crepidula aculeata Gruel . 

 Natica pusilla Say .... 

 Nevcrita du plica (a Say . . 

 Sigaretus perspectivus Say. 

 Isclmochiton papillosus C. 



B. Ads 



Acanthochites spiculosus 



Reeve 



Polygyra cereolus Mulilf. . 

 Polygyra cereolus Carpen- 



teriana Bland 96 



Polygyra uvulif'era Shutt. . 2070 

 Succinea campestris Say. . 35 



20 



15 



440 



NOTES ON POLYGYRA APPRESSA. 



BY G. H. CHADWICK. 



In Messrs. Pilsbry and Johnson's recent catalogue of North Amer- 

 ican Land Shells, Polyyyra ( Triodopsis) appressa (Say), is accredited 

 to Scott Co., Va., among other localities. A fine series from that 

 locality having come under my notice, I perceived a considerable 

 difference between them and northern specimens, and a careful ex- 

 amination and comparison with examples of the typical form from 

 Bernadotte, 111., and var. periyrapla Pilsbry, from Tennessee, seem 

 to fully confirm the distinction. 



The Virginian variety, for which I propose the name sciilptior, 

 may be known by the following characters : 



Surface costulate above, horn-colored inclining to reddish chestnut, 

 becoming smoother and greenish beneath, entirely covered with a 

 fine spiral granulation ; upper lip-tooth obsolete; parietal tooth as in 

 typical appressa. Diam. 14 to 18 mm. ; alt. 7 to 9 mm. 



While the warm color and coarse ribs are noticeable and constant 

 features, the microscope discloses the most important diagnostic char- 



