THE NAUTILUS. VI 1 



Polygyra tridentata discoidea in Indiana . . . .92 



Psilocochlis Dall, n. subg. . . . "... 9 



Ptychocheilus ... . '"." . 107 



Publications received . . 24, 68, 92, 108, 120, 132 



Punctum apertum Pils. & Hir., n. sp. 5 



Punctum elachistum Pils.& Hir., n. sp. . . ."' 5 



Pupa, note on the nomenclature of the snails usually called. 103 

 Pupilla . 103, 105, 116, 118 



Pupilliclse, notes on the nomenclature of . . 105, 114, 116 

 Santa Catalina Island, a dredging trip to . .18 



Saraphia . 105, 106 



Scalaria candidissima at Algiers ... .21 



Schizostoraa castaneum, constrictum, etc. . .40 



Scissurella (Schizotrochus) kelse} r i Dall, n. sp. . . . 124 



Scyphomya . . .113 



Sensitiveness of snails to weather conditions . ... . 109 



Septidfe . . . . 69 



Snails and slugs in the New International Encyclopedia . 22 

 Sonorella lohrii lioderma Pils., n. subsp . . . 59 



Southwestern shells . . . ... 49 



Sphyradium . . 103,107,115,117 



Stenothyra formosana Pils. & Hir., n. sp. . . ... 8 



Somatogyrus walkerianus Aldrich . . . . 140 



Strombus pugilis L., sexual dimorphism in . . . . 138 



Terebra histrio Desh. from Senegal, W. Africa . . . 21 

 Teredina fistula H. C. Lea . . .13 



Teredo fistula H. C. Lea, generic position of . . 13 



Tornatellina monodonta Pils. & Hir., n. sp. . 6 



Tomigerus, new species of . . . .144 



Trichodina Anc. . . ... 143 



Tulotoma magnifica Conr., etc. . . . ... 43 



Turbinella, a singular eocene ... . 9 



Turbinella (Psilocochlis) mccallie Dall, n. sp. . 9 



Unio browni Whitf. preoc. = Parreysia barnumi Pils. . 12 

 Unio chipolaensis Walker, n. sp. . 135 



Unio crassidens from Wisconsin, fossil (PI. VII) , . 97 

 Unionidae at Eastham, Mass. . . 47 



Unionidse from the Chipola river . . 134 



Vallonia pulcbella (Mull.) . . 129 



