THE NAUTILUS. 



Shell collecting days at Frenchman's Bay, Me. . ... 109 



Shells of Douglas Co., Wash . 84 



Sigaretus noyesii Dall., n. sp. . . . . . . 31 



Siphonaria alternata var. intermedia Davis, n. V. . . . 127 



Siphonaria alternata var. opalescens Davis, n. v. . . .127 



Sitala niijiraana Pils. & Hir., n. sp. . . . .54 



Somatog3^rus constrictus Walker, n. sp. (PL V, fig. 8) . .135 

 Somatogj'rus coosaensis Walker, n. sp. (PI. Y, figs. 6, 7) . 137 

 Somatogyrus crassus Walker, n. sp. (PI. V, figs. 11, 12) . 138 

 Somatogyrus georgianus Walker, n. sp. (PI. V, fig. 13) .139 

 Somatogyrus hinkleyi Walker, n. sp. (PI. V, figs. 1,2) . 135 

 Somatogyrus nanus Walker, n. sp. (PL Y, fig. 4) . . . 136 



Somatog3'rus obtusus Walker, n. sp. (PL Y, fig. 10) . . 138 

 Somatogyrus parvulus Tryon (PL Y, figs. 22, 23) . .142 



Somatog3'rus pennsylvanicusWalker,n.sp. (PLY, figs. 15,16) 140 

 Somatogyrus pilsbryanus Walker, n. sp. (PL Y, figs. 20,21) 142 

 Somatog3'rus umbilicatus Walker, n. sp. (PL Y, fig. 5) .137 

 Somatogyrus virginicus Walker, n. sp. (PL Y, figs. 17, 18, 19) 141, 

 South America, new land snails from . 82, 89, 102 



Sph3'radium . . . . .116 



Streptost3'la clavulata Ancey, n. sp. . . . . . 56 



Streptost3da sumichrasti Ancey, n. sj). . . . .56 



St3'lobates Dall, n. gen. ....... 62 



St3'lobates seneus Dall, n. sp. ...... 62 



Succinea ikiana Pils. & Hir., n. sp. . . . . 117 



Tellina laevigata var. Stella, n. v. . . . . . 128 



Tertiar3' fauna of Florida, contributions to the . . .94 



Tonicia arnheimi Dall, n. sp, . . .37 



Tornatellina kitaiwojimana Pils. & Hir., n. sp. . . . 53 



Torquilla ; : .115 



Trishoplita mesogonia var. minima P. & H., n. v. . . 106 

 Trivia ritteri Ra3'mond, n. sp. . . . . . .85 



TrochidtB, a new genus of ....... 61 



Umbraculum (Eosinica) elevatum/Aldr. (fig. 1) . . .19 



TJnio declivis Say, the specific value of (PL III,) . 49, 51 



Unio geometricus Lea. (PL III) .... 49, 51 



Unio tetralasmus Say (PL III.) 49, 51 



Unio, notes on the structure of the shells of . . .98 

 Unio (Quadrula) . . .111 



