Vlll THE NAUTILUS. 



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



Shells of Douglas Co., Wash. . . . . 84 



Sigaretus noyesii Ball., n. sp. . . . . . 37 



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



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



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



Somatogyrus constrictus Walker, n. sp. (PI. V, fig. 3) . . 135 

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

 Somatogyrus nanus Walker, n. sp. (Pi. V, fig. 4) . . . 136 

 Somatogyrus obtusus Walker, n. sp. (PI. V, fig. 10) . . 138 

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

 Somatogyrus pennsylvanicusWalker,n.sp. (PLY, figs. 15,16) 140 

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

 Somatogyrus 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 



Sphyradium . . . . . . . . .116 



Streptostyla clavulata Ancey, n. sp. . ... 56 



Streptostyla sumichrasti Ancey, n. sp. . . .56 



Stylobates Dall, n. gen. ....... 62 



Stylobates seneus Dall, n. sp. . . . . . .62 



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



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



Tertiary fauna of Florida, contributions to the . . .94 

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



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



Torquilla . . 115 



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

 Trivia ritteri Raymond, n. sp. . . . . . 85 



Trochidie, a new genus of . . . . . . .61 



Umbraculum (Eosinica) elevatumJAldr. (fig. 1) . . .19 

 Unio 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) . . . . . . . .Ill 



