VI THE NAUTILUS. 



Ovula nipponensis Pils., n. sp. (PI. VII, fig. 9) . . 114 

 Panama, Collecting in .... . 121 



Paludestrina salsa at Rowley, Mass. . . 54 



Parreysia dalliana Frierson, n. sp. . . 142 



Physa sayi ...... . . 65 



Physunio micropterus Morelet . . . 141 



Pisidium abditum Hald. ...... 6 



Pisidium abditum subrotundum Sterki . . . 7, 65 

 Pisidium alleni Sterki, n. sp. . 9 



Pisidium columbianum Sterki, n. sp. . . 117 



Pisidium fraudulentum Sterki, n. sp. . 95 



Pisidium f urea turn Sterki, n. sp. .118 



Pisidium (furcatum var.?) rhombicum Sterki . .119 



Pisidium glabellum Sterki, n. sp. ..... 137 



Pisidium lerrnondi Sterki, n. sp. . 138 



Pisidium minus Ad. . .... 7 



Pisidium (nevadense var. or sp.?) modicum Sterki, n. . 137 

 Pisidium overi Sterki, n. sp. . . . .136 



Pisidium peraltum Sterki. . . . 95 



Pisidium regulare Prime . . .... 7 



Pisidium sphaericum Sterki, n. sp. . . . .8 



Planorbis bicarinatus Say, abnormal (PI. V, fig. 4) . .41 

 Pleistocene fossils from Eastern Cuba . . .69 



Pleurodonte (Labyrinthus) goldmani sipunculata 60 

 Pleurodonte marginella Gmel. . .3 



Polygyra albolabris Say (PI. V, fig. 13). . . .40 



Polygyra appressa Say. . . . . . . 1, 93 



Polygyra cereolus (PI. V, figs. 1, 2, 3) 39 



Polygyra cereolus and var. carpenteriana . . 16, 31, 33 

 Polygyra elevata Say (PI. V, fig. 15) . . 40, 91 



Polygyra exoleta Binn. (PI. V, fig. 14) .. . 40 



Polygyra fallax Say. ... . .80 



Polygyra fallax goniosoma Pils., n. subsp. . . .80 



Polygyra fraterna Say (PI. V, fig. 5). . 40, 91 



Polygyra hirsuta Say ... . 40, 91 



Polygyra hopetonensis var. obsoleta. . . . .79 



Polygyra inflecta Say (PI. V, fig. 6). . . 39, 91 



Polygyra mobiliana, banded . . . . .120 



Polygyra palliata Say, in New England . . . .59 



Polygyra profunda Say (PI. V, fig. 12) . .40 



Polygyra texasiana. ....... 90 



Polygyra tridentata Say (PI. V, figs. 10, 11) . .39 



Polygyra vannostrandi Bid 79 



Polymita muscarum ....... 2 



Pseudogalba new name for Simpsonia . . 120 



Publications received . . . . 60, 71 



Pyramidella bartschi=0dostomia bartschi. . . 54 



Pyramidella fusca and producta at Chatham, Mass. . . 55 



Radix auricularia at Cambridge, Mass 116 



Rostellaria curvirostris Lam. (young) . . . .79 



