THE NAUTILUS. es Vv 
Naiad Fauna of the Mississippi River, notes on the ..... 80 
REMMIPTEAEMS TE Met es oo 4 cos ce ao eine ae ase 1 
North Dakota, shells from Jamestown ................. 29 
Pe etnies. lb namede sea ane 117 
Olivella boetica, new varieties ..................2-. 118, 119 
NER oS eet SS cies cata vaca tela Bee 6, 12 
eeahetes clote: Werriss; n. subsp. .........-22-..<000- 5,13 
Oreohelix cummingsi Ferriss, i: SADR. = sl oaoane toes 5, ie 
Seems eeemnemdirana Pils.!. oi)... lalla. sce ncue 
DeemenPINCHRIN Pts.” of) 2 2... 1. cc ew ae ws oa opie 108 
Pachycheilus indiorum (Morelet) .................... 44 
Pachycheilus lacustris (Morelet) ...................-. 37 
Pachycheilus pottsianus Hinkley, n. sp. ............... 54 
SPM eet et ens o  oh Ss hos ciate os meres 88 
Poraviees mubidentaia (Bmmn.) ........2....2.2268- 28 
Pree paerlianicus Gmel) 22... ol lle ee eee eee 60 
Pecten (Patinopecten) rhytidus Dall, n. sp. ............ 77 
Pecten (Plagioctenium) hallae Dall, n. sp. ............ 76 
a EE San ea a ne 137 
LS ES LeU SE | Eel ge ee ane a ie 137 
Pennsylvania, land shells from Beaver Co. ............ 28 
Physa humerosa interioris Ferriss, n. subsp. ........... 2,4 
0 LE Se) Be en 68 
SeenON IY ol bl ee ect e ce nnne 10 
er eo aes sawn ening tee 133 
Perec avisorme Conrad 2... oo... cee eee eae 85 
Pama tideniaa umbilicata Ckll. .........:5.-..2-2.0-- 14 
PUP ePEIEI A AY 2c ss ee seco eis esas 31 
rremeen ei CEPIRS on. eevee eee ce 25 
Polygyra multilineata altonensis Baker, n. var. ........ 65 
Polygyra profunda pleistocenica Baker, n. var. ........ 66 
Portland catalogue, species named in the ............ 97, 124 
Se EbtneeS, VATE... 2. ee a ee lee ngs oe 31 
Psammacoma brasiliana Dall, n. sp. ..............--+- 132 
Ptychobranchus subtentum Say .................--06- 88 
AIEEE COUVCR 6 cos 5 acs essa elec ea se eee 31, 70, 104 
Pupilla hebes mut. albescens Ferriss .................. 8,14 
Ds Ee gl 0 6 13 
RINE PRPEIEAGL ORY. . 5 iso ed ss ss eee ee es os 14 
Pyramidula cumberlandiana Lea (pl. 1, fig. 1)......... 24 
Pyramidula cumberlandiana alabama Clapp, n. var. (pl. 
MPR as a Se a ents wise 2 alice oie es sai 25 
Pyramidula cumberlandiana columba Clapp, n. var. (pl. 
OEM 15s gio gape ete lca ahd,e ie a's Siar siee & 3 25 
Pyramidula from Alabama, a new species of ........... 23 
Pyramidula picta Clapp, n. sp. (pl. 1, fig. 4) ........... 23 
