62 



Gasteropoda. 

 Opisthobranchiata. 



Phillne quadrata, Wood. 

 Philine lineolata, Couth. 

 Scaphander puncto-striata, M. 

 Dlapliana debilis, Gould. 

 Utriculus pertenuis, Migh. 

 Cylichna alba, Brown. 



Prosobranchiata. 



Chiton marmoreus, 0. Fahr. 

 Chiton Ifevis, Penn. 

 Chiton albus, Lin. 

 Tectura testudinalis, MilU. 

 Lepeta caeca, Milll. 

 Pilidium rubellum, 0. Fabr. 

 Crepidula unguiformis. Lam. 

 Crepidula fornicata, Lin. 

 Crepidula convexa, Say. 

 Cemoria noachina, Lin. 

 Margarita helicina, O. Fahr. 

 j\[argarita argentata, Gould. 

 Margarita obscura, Couth. 

 Margarita varicosa, Migh. 

 Margarita cinerea, Couth. 

 Margarita groenlandica, Ch. 

 Skenea planorbis, Fahr. 

 Rissoa minuta, Tott. 

 Lacuna vincta, Mont. 

 Littorina litorea, Lin. 

 Littorina palliata. Say. 

 Littorina rudis, Mont. 

 Scalaria groenlandica, Perry. 

 Turritella erosa, Couth. 



Turritella reticulata, Migh. 

 Aporrhais occidentalis. Beck. 

 Bittium nigrum, Tott. 

 Menestho albula, Moll. 

 Velutina zonata, Gould. 

 Velutina haliotoides. Mull, 

 ^Lirsenina groenlandica, M. 

 Natica clausa. Sow. 

 Lunatia heros, Say. 

 Lunatia triseriata, Say. 

 Lunatia groenlandica, Moll. 

 Mamma ? immaculata, Tott. 

 Bulbus flavus, Goidd. 

 Amauropsis helicoides, John!<t. 

 Bela turricula, Mont. 

 Bela harpularia. Couth. 

 Bela violacea, Migh. 

 Bela decussata, Couth. 

 Bela pleurotomaria. Couth. 

 Columbella rosacea, Gould. 

 Purpura lapillus, Lin. 

 Nassa obsoleta. Say. 

 Nassa trivittata. Say. 

 Buccinum undatum, Lin. 

 Buccinum ciliatum, 0. Fabr. 

 Fusus pygmaeus, Gould. 

 Fusus islandicus, (■hemn. 

 Fusus decemcostatus. Say. 

 Trophon craticulatus, 0. Fabr. 

 Trophon clathratus, Lin. 

 Trophon scalariformis, Gould. 

 Trichotropis borealis, B. ^ S. 

 Admete viridula, 0. Fahr. 

 Fasciolaria ligata, Migh. 



On the occurrence of Massive Datholite in the mines 

 of Lake Superior. By Augustus A. Hayes, m.d. 



A few weeks since Dr. N. C. Keep, of this city, called my attention 

 to a white, compact mineral, closely resembling an artificial product, 

 which he had found to be very fusible, and to afford a green-colored, 

 transparent globule, before the blowpipe flame. 



On testing this body, I found that its easy fusibility was due to the 

 considerable proportion of the borate of lime contained in it, and that 



