THE NAUTILUS. 



VI 1 



Polygyra tridentata discoidea in Indiana . . . . 92 



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



Ptychocheilus . . . . . . . . 101 



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 



103, 107, 115 



Pupilla ....... 



Pupillidse, notes on the nomenclature of 

 Santa Catalina Island, a dredging trip to . 

 Saraphia ....... 



Scalaria candidissima at Algiers . 

 Schizostoma castaneum, constrictum, etc. . 

 Scisgurella (Schizotrochus) kelseju Dall, n. sp. 

 Scypliomj^a ...... 



Sensitiveness of snails to weather conditions 

 Septidffi ....... 



Snails and slugs in the New International Encycloped 

 Sonorella lohrii lioderma Pils., n. subsp 

 Southwestern shells .... 



Sphj-radium . 



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

 Somatogyrus walkerianus Aldrich 

 Strombus pugilis L., sexual dimorphism in . 

 Terebra histrio Desh. from Senegal, W. Africa 

 Teredina fistula H. C. Lea .... 



Teredo fistula H. C. Lea, generic position of 

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

 Tomigerus, new species of . 

 Trichodina Anc. ...... 



Tulotoma magnifica Conr., etc. . 



Turbinella, a singular eocene 



Turbinella (Psilocochlis) mccallie Dall, n. sp. 



TJnio browni Whitf. preoc. = Parreysia barnumi Pils. 



Unio chipolaensis Walker, n. sp. ... 



XJnio crassidens from Wisconsin, fossil (PI. VII) 

 Unionidae at Eastham, Mass. .... 



Unionida? from the Chipola river 



Vallonia pulcbella (Miill.) 



103, 105, 116, 118 



. 105, 114, 116 



. 18 



105,106 



21 



40 



124 



113 



109 



69 



22 



59 



49 



in 



140 



138 



21 



13 



13 



6 



144 



143 



43 



9 



9 



12 



135 



97 



47 



134 



129 



