54 THE NAUTILUS. 



Terebra dislocata Say. . . 1 Vermicularia spifata Phil . 110 



Terebra protexta Conr. . . 20 Litorina angulifera Lam. . 296 



Conus pealii Green .... 95 Rissoina chesnelii Michaud. 338 



Drillia leucocyma Dall. . . 10 Crepidula fornicata L. . . 4 



Drillia tliea Dall 20 Crepidula plana Say ... 5 



Mangilia biconica C. B. Ads. 85 Crepidula aculeata Gruel . 7 



Mangilia stellata Slearns . 65 Natica pusilla Say 120 



Mangilia cerinella Dall . . 25 Neverita duplicata Say . . 2 



Oliva lilerata Lam. ... 6 Sigaretus perspectives Say. 23 



Olivella mutica Say . . . 1450 Ischnochiton papillosus C. 



Olivella floralia Duel . . . 12 B. Ads 20 



Olivella bullula Reeve Acanthochites spiculosus 



(young) 60 Reeve 15 



Marginella aureocincta Polygyra cereolus Mublf. . 440 



Stearns 150 Polygyra cereolus Carpen- 



Marginella apicina Menke . 630 teriana Bland 96 



Marginella denticulata var. Polygyra uvulifera Shutt. . 2070 



opalina Stearns .... 54 Succinea campestris Say. . 35 



NOTES ON POLYGYRA APPRESSA. 



BY G. H. CHADWICK. 



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

 ican Land Shells, Polygyra ( Triodopsis) oppressa (Say), is accredited 

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

 locality having come under my notice, 1 perceived a considerable 

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

 amination and comparison with examples of t lie typical form from 

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

 to fully confirm the distinction. 



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

 may be known by the following characters : 



Surface costidate 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- 



