THE NAUTILUS. 



Notes on California shells. 



Opeas goodalli Miller, on. 



Opeas pumilum Pfr. 



Oliva amethystina Bolten. 



Oliva angulata Lam. (var. nivea Pils. ) 



Oliva annulata Gmel. 



Oliva bulbosa Bolten 



Oliva caerulea Bolten 



Oliva circinata Marrat 



Oliva circinata var. citrina Johnson, n. v 



Oliva fulgurator Bolten 



Oliva incrassata Solander. 



Oliva oliva Linne 



Oliva peruviana var. castanea Ford 



Oliva peruviana var. livida Johnson, n. v 



Oliva sericea Bolten. 



Oliva sericea var. fordi Johnson, n. v. 



Oliva sericea var. marratti Johnson, n. v. 



Oliva sericea var. miniacea Bolten 



Oliva spicata Bolten. 



Oliva spicata var. hemphilli Ford 



Oliva spicata var. perfecta Johnson, n. v 



Oliva tigrina var. fallax Johnson, n. v. 



Oliva variegata Bolten 



Oliva vidua Bolten . 



Olividae, Notes on the 



Oscilla ..... 



Ovulactaeon aldrichi Wheeler, n. sp. (PI. IV, fig 



Pachypoma insequale var. spiratum Dall, n. v 



Paludestrina plana Aldr. (PL VIII, fig. 3) 



Petterd, W. F. (obituary). 



Pisidium, Methods of collecting 



Plague of huge snails 



Planorbis antiquitus Aldr. (PI. X, fig. 16) 



Planorbis antrosus Conr. . 



Planorbis engonatus Conr. 



Planorbis bicarinata Lam. 



Planorbis bicarinatus Say. 



95, 109, 124 

 . 31 

 . 31 

 68, 124 

 24, 123 

 124 

 65 

 67 

 123 

 123 

 123 

 122 

 124 

 122 

 122 

 50 

 51 

 51 

 51 

 121 

 122 

 122 

 65 

 67 

 64, 124 

 49, 64, 121 

 . 54 

 13, 73 

 . Ill 

 . 139 

 . 72 

 . 140 

 . 84 

 . 140 

 . 137 

 . 137 

 . 136 

 . 136 



6) 



