VI THE NAUTILUS. 



Limnaea palustris Mull. . . . . . . .111 



Limnaea reflexa jolietensis Baker, n. var. . . . .17 



Limnaea stagnalis L. var. appressa Say . . . .110 



Liomesus nassula Dall, n. sp. . . . . .89 



Loo Choo Islands, new land shells from the . . 18, 61 

 Lucapina crenulata Sowb., animal of . . . . .71 



Lucina, a gigantic fossil ....... 40 



Lucina megameris Dall, n. sp. . . . . .41 



Macrochlamys cerasina Pils., n. sp. ..... 117 



Mandarina exoptata Pils., n. sp. . . . . .117 



Margaritana margaritifera L 89 



Meseschiza grosvenorii Lea, Notes on .... 5 



Microcystina hahajimana Pils., n. sp. .... 118 



Modiolaria discors L. ....... 106 



Modiolus hamatus Say ....... 96 



Modiolus rnodiolus L. 104 



Modiolus plicatulus Lam. . . . . . . .105 



Mollusks, the approximate number of . . . .46 



Monoplex Perry = Ranularia Schum . . . .108 



Montana, collecting shells in . . . 86,103,110,129 

 Mytilus edulis L. ........ 94 



Mytilus pellucidus Penn. ....... 95 



Navanax inermis Cooper, ....... 72 



Nenia smithiae Pils., n. sp. . . . . . . 37, 39 



Ostrea borealis Lam. ........ 131 



Ostrea virginica Lam. . . . . . . .131 



Pecten irradians Lam. . . . . . . .113 



Pecten tenuicostatus Migh. and Ad. . . . . .113 



Physa anatina Lea ........ 57 



Physa ancillaria Say ....... 42, 128 



Physa ampullacea Gould ... . . . . .112 



Physa billingsi Heron . . . . . . .56 



Physa brevispira Lea ....... 57 



Physa crassa Walker ........ 43 



Physa crocata Lea . ... . . . . .70 



Physa cubensis Pfr. ........ 58 



Physa deform is Currier ....... 55 



Physa distorta Hald 70 



Physa elliptica Lea . ... . . . . .54 



