VI 



THE NAUTILUS. 



PleurotomidsB, Californian ...... 



Pliocene fossils from Georgia, with descriptions of new 



142 



131 



species. . ...... 



Polygyra palliata from the District of Columbia 

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

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

 Potamolithus paysanduanus von Iher. , n. sp. . 

 Potamolithus paysanduanus form impressa von Iher 

 Potamolithus paysanduanus form sinulabris von Iher 

 Potamolithus filipponei von Iher. 

 Pseudodon ....... 



Pterides, Notes on the genus .... 



Publications ....... 



Punctum pygmaeum from the District of Columbia 



Purpura crispata and saxicola. 



Pyramidellid nomenclature, Some notes on 



Segmentina christyi Dall, A new specie? for the U. S. fauna 



Shall we be ordered off the beaches ? ... 



Shell collecting in Puget Sound and Alaska 



Shells from the Bay of Cadiz region 



Shells of Mount Equinox, Vermont. 



Snails from Kentucky, Notes on some land 



Solariella triplostephanus Dall, n. sp. 



Spatha kamerunensis Walker, n. sp. (PI. Ill, figs 



Spatha kamerunensis, On the soft parts of. 



Sphserium, Methods of collecting 



Texas, Notes on land shells from Matagorda Peninsu 



Thais emarginata Desh. . . . , . 



Thais lima Mart. ...... 



Thais plicata Mart. ...... 



Trivia pediculus permagna Johnson, n. v. 



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



Truncilla, Notes on (with key to species). 



Tudora armata C. B. Ads. 



Unio compressus Heude . 



Unio vestitus Heude. 



Unio ingallsiana Lea. 



Unio undatus Barnes, On the validity of 



. 138 

 . 24 

 . 132 

 . 138 

 . 16 

 . 15 

 . 16 

 . 15 

 . 97 

 . 14 

 36, 70 

 . 24 



2) 



la 



37 

 52 

 11 



. 48 



25, 44 



81, 101 



n 



90 

 34 

 38 

 39 



140 

 4 

 37 

 37 

 37 

 12 

 42 

 75 

 88 

 93 

 93 

 98 



, 16 



