THE NAUTILUS. 



Lamarck's Collection of Shells ...... 



Lampsilis ventricosa (Barnes) in the upper Potomac 



drainage ....... 



Lymnsea auricularia near Philadelphia 



Lymnsea from Montana, A new 



Lymnsea parva. ...... 



Lymnsea (Radix) amicularia at Cambridge, Mass. 

 Lymnsea (Radix) auricularia in Colorado . 

 Macroceramus canimarensis rotundibasis Pils., n. subsp. 

 Maine mollusca, Notes on .... 



Marine gasteropoda from Aden with description of new 



forms ........ 



Marginella obscura Reeve, (PL IV, fig. 16) 

 Megaustenia Ckll. n, n. for Cryptosoma preoccupied 

 Mexico, Shell collected at Manzanillo, west 

 Microceramus perconicus trinidadensis Pils., n. var. (PI 



VIII, figs. 15, 17, 18) 



Microceramus sanctispiritensis Pils., n. sp. (PI. VIII, figs 



11, 12, 13) 



Missouri, Shells of southeast .... 



Mitra costellaris Lam. ..... 



Mitra deshayesii Reeve ..... 



Montana, A list of the Mollusca from the Mussel Shell 



valley ........ 



Murex despectus Linne ..... 



Murex fulvescens Sowerby .... 



Musculium orbiculare Sterki, n. sp. . 



Nassa pulla var. minor Smith n. var. (PI. IV, fig. 17) 



New England notes ...... 



Nerita cancellata Herm. ..... 



New Mexico, Mollusca from Northern 



New Orleans mollusca ..... 



Nodularia jourdyi Morelet .... 



Notes . . 12, 24, 35, 48, 59, 69, 84, 96, 108, 119, 132 

 Nyctilochidse ....... 



Nyctilochus Gistel = Septa Perry = Triton Auct. 

 Odostomia trifida, winkleyi, etc. 

 Oliva andamanensis Bdg. (PI. IV, fig. 7) . 

 Opeas clavalinum kyotoense at Cambridge, Mass. 

 Oreohelix alta Pils., n. var. .... 



Oreohelix carinifera Pils., n. sp. . . . 



Oreohelix colonies in Colorado .... 



Oreohelix cooperi W. G. B. . 



Oreohelix coqperi minor Ckll. .... 



Oreohelix haydeni betheli n. subsp. Pils. and Ckll. 

 Oreohelix haydeni Gabb. . .11 



Oreohelix haydeni gabbiana Hemp. .11 



Oreohelix hendersoni Pils., n. sp. . . . 11 



Oreohelix strigosa depressa Ckll. (PI. V, fig. 16) 41 



Ovula (Neosimnia) hirasei Pils., n. sp. (PI. VII, fig. 4) . 



119 



51 



27 

 115 



65 

 116 



84 

 130 



73 



74 



77 



70 



143 



129 



127 

 90 



77 

 77 



130 



47 



120 



140 



77 



54 



46 



80 



36 



141 



144 



59 



59 



54, 74 



77 



24 



144 



89 



9 



9 



10 

 144 

 , 89 

 , 30 

 , 29 

 ,81 

 114 



