THE NAUTILUS. 



Til 



Planorbis florissantensis Cockerell, n. sp. .... 100 

 Planorbi9 nautileus Linn., in Illinois ..... 120 

 Planorbis nitidus Gray ....... 105 



Plejona Bolten . 143 



Polygyra decepta Clapp, n. sp. (fig.) . . . . .25 



Polygyra ferrissi sericea Ferri9S, n. sp. . . . . 67 



Polygyra inflecta approximans Clapp, n. subsp. (PI. Ill, 



fig. 6) 74 



Polygyra multilineata algonquinensis Nason, n. var. . . 141 



Polygyra smithii Clapp, n. sp. (PI. Ill, figs. 1-4) . . 73 

 Potamopyrgus brevior Ancey, n. sp. ..... 46 



Prince Edward Island, shells of . . . . . .103 



Publications received . . .24, 35, 48, 60,71, 92, 108 



Pupa cincinnatiensis Judge ..... 121,124 



Pupa curvidens Gould ...... 12, 124 



Pupilla floridana Dall . ...... 121, 125 



Pyrgulopsis mississippiensis Pilsbry (PI. Y, fig. 15) . . 116 



Quadrula archeri Frierson,n. sp. (PI. I, figs. 1,2) . . 13 

 Quadrula rubidula Frierson,n. sp. (PI. I, figs. 3. 4) . 14 



Somatogyrus aldrichi Walker, n. sp. (PI. Y, tig. 9) . .114 

 Somatogyrus biangulatus Walker, n. sp. (PI. Y, fig. 6) . 99 

 Somatogyrus excavatus Walker, n. sp. (PI. V, fig. 7) . . 100 



Somatogyrus humerosis Walker, n. sp. (PI. Y, fig. 2) . 98 



Somatogyrus pennsylvanicus I ilsbrv, (PI. Y, fig9. 17, 18) . 116 

 Somatogyrus pumilus Conrad, (PI. Y, fig. 10.) . . . 115 



Somatogyrus quadratus Walker, n. sp. (PI. Y,figs. 3, 4.) . 98 

 Somatogyrus strengi Pilsbry & Walker, n. sp. (PI. Y, fig. 



5) '.99 



Somatogyrus substriat.us Walker, n. sp. (PI. Y, fig. 1.) . 97 

 Somatogyrus tennesseensis Walker, n. sp. (PI. Y. fig. 8.) . 114 

 Stegodera angusticollis Mart. (PI. II, figs. 1, 2, 3.) . 64, 65 

 Stegodera, notes on Moellendorffia and . . . .63 



Straparollina harpa Hudson, (fig.) 102 



Strorabus pugilis nicaraguaensis Fluck, n. var. . . .32 



Stiombus pugilis, some note9 on living, (PI. Ill, figs. 11, 13) 85 

 Succinea floridana Pilsbry, n. sp. . . . .40 



Succinea indiana Pilsbry, n. sp. ...... 28 



Succinea retusa magister Pilsbry, (Fig. 2.). . . . 109 



Tonicella blaneyi Dall, n. sp. (PI. IY.) . . . .88 



Trivia acutidentata Gask., note on 132 



Trochorbis Benson, . . . . . . . .105 



Unio luteolus, note on Canadian . . . . .34 



Unionidae from Alabama, new "13 



Unionidae, notes on young ....... 49 



Unionidse of Wisconsin ....... 59 



Yalvata humeralis ........ 130 



Yalvata lewisii ......... 2 



Yalvata, note on 28 



