VI THE NAUTILUS. 



Pleurotomidse, Californian ...... 142 



Pliocene fossils from Georgia, with descriptions of new 



species 131, 138 



Polygyra palliata from the District of Columbia . .24 

 Potamides saltillensis Aldr. (PI. VIII, fig. 1) . . 132 



Potamides cancelloides Aldr. (PI. VIII, fig. 2, 2a) . . 138 

 Potamolithus paysanduanus von Iher., n. sp. . . .15 



Potamolithus paysanduanus form impressa von Iher. . 15 

 Potamolithus paysanduanus form sinulabris von Iher. . 15 

 Potamolithus filipponei von Iher. . . . .15 



Pseudodon . ... . . 97 



Pterides, Notes on the genus . .... 14 



Publications .... ... 36, 70 



Punctum pygmaeum from the District of Columbia. . 24 

 Purpura crispata and saxicola. . . . . .37 



Pyramidellid nomenclature, Some notes on . .52 



Segmentina christyi Dall, A new species for the U. S. fauna. 11 

 Shall we be ordered off the beaches ? . . .48 



Shell collecting in Puget Sound and Alaska . . 25, 44 

 Shells from the Bay of Cadiz region . . 81, 101 



Shells of Mount Equinox, Vermont. . . . .72 



Snails from Kentucky, Notes on some land . . .90 

 Solariella triplostephanus Dall, n. sp. . . . . 34 



Spatha kamerunensis Walker, n. sp. (PI. Ill, figs. 1, 2) . 38 

 Spatha kamerunensis, On the soft parts of. ... 39 



Spheerium, Methods of collecting ..... 140 



Texas, Notes on land shells from Matagorda Peninsula . 4 

 Thais emarginata Desh. ....... 37 



Thais lima Mart .37 



Thais plicata Mart. ........ 37 



Trivia pediculus permagna Johnson, n. v. . . .12 



Truncilla lewisii Walker, n. sp. (PI. Ill, figs. 3-5) . . 42 

 Truncilla, Notes on (with key to species). . . .75 



Tudora armata C. B. Ads. ...... 88 



Unio comprcssus Heude ... ... 93 



Unio vestitus Heude. . ... 93 



Unio ingallsiana Lea. .... .98 



Unio undatus Barnes, On the validity of. . . ,16 



