THE NAUTILUS. vii 



Planorbis florissantensis Cockerell, n. sp 100 



Planorbis nautileus Linn., in Illinois ... . 120 



Planorbis nitidus Gray . . . . . . .105 



Plejona Bolten 143 



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



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

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



fig. 6) . . . . ?4 



Polygyra multilineata algonqninensis 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 



Pyrii'ulopsis mississippiensis Pilsbry (PL 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. V, fig. 9) . .114 

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

 So'matogyrus excavatus Walker, n. sp. (PI. V, tig. 7) . . 100 

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



Somatogyrus pennsylvanicua I ilsbry, (PI. Y, figs. 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, tig. 



5) . ' .99 



Somatogyrus substriatus Walker, n. sp. (PL Y, fig. 1.) .97 

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

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

 Stegodera, notes on Moellendorttia and . . . .63 



Straparollina harpa Hudson, (fig.) . . . . .102 



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



Sti'ombus pugilis, some notes on living, (PL III, figs. 11, 13) 85 

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



Succinea Indiana Pilsbry, n. sp. . . . . . .28 



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



Tonicella hlaneyi Dall, n. sp. (PL IY.) . . . .88 



Trivia acutidentata Gask., note on ..... 132 



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



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



Unionidge from Alabama, new .....* 13 



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



Unionidse of Wisconsin ....... 59 



Yalvata bumeralis ........ 130 



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



Yalvata, note on . 28 



