THE NAUTILUS. V 



Notes on California shells. . 95, 109, 124 



Opeas goodalli Miller, on. . . 31 



Opeas pumilum Pfr. . ... 31 



Oliva amethystina Bolten. . 68, 124 



Oliva angulata Lam. (var. nivea Pils. ) . 24, 123 



Oliva annulata Gmel. . .124 



Oliva bulbosa Bolten . . 65 



Oliva caerulea Bolten . . 67 



Oliva circinata Marrat ... . 123 



Oliva circinata var. citrina Johnson, n. v. .123 



Oliva fulgurator Bolten . .123 



Oliva incrassata Solander. . . 122 



Oliva oliva Linne . . . .124 



Oliva peruviana var. castanea Ford . . 122 



Oliva peruviana var. livida Johnson, n. v. . . 122 



Oliva sericea Bolten. ... .50 



Oliva sericea var. fordi Johnson, n. v. . 51 



Oliva sericea var. marratti Johnson, n. v. . . .51 



Oliva sericea var. miniacea Bolten . . .51 



Oliva spicata Bolten. ... .121 



Oliva spicata var. hemphilli Ford . .122 



Oliva spicata var. perfecta Johnson, n. v. . 122 



Oliva tigrina var. fallax Johnson, n. v. . 65 



Oliva variegata Bolten . . .67 



Oliva vidua Bolten . . 64, 124 



Olividaj, Notes on the 49, 64, 121 



Oscilla . . . . . . . .54 



Ovulactaeon aldrichi Wheeler, n. sp. (PI. IV, fig. 6). 13, 73 

 Pachypoma inaequale var. spiratum Dall, n. v. . .111 



Paludestrina plana Aldr. (PL VIII, fig. 3) .139 



Petterd, W. F. (obituary). . ... 72 



Pisidium, Methods of collecting . . 140 



Plague of huge snails .... 84 



Planorbis antiquitus Aldr. (PI. X, fig. 16). . 140 



Planorbis antrosus Conr. . . . . . . .137 



Planorbis engonatus Conr. . . 137 



Planorbis bicarinata Lam. . . . . .136 



Planorbis bicarinatus Say. . . . 136 



