THE NAUTILUS. V 
Mactridae of North America, synopsis of the . . . 25, 39 
Mactra Richmondi Dali, n. sp. . . . . . . 26, 28 
Mactrella (Harvella) elegans Sowb. .... 28 
Mactrella subalata Morch. ...... 42 
Margarita undulata ........ 78 
Melongena corona ........ 11 
Megatebennus bimaculatus . . . . . . 112 
Mollusca of the Paris Mains ...... 59 
Mollusks of Allegheny Co., Pa. . . . . . 116 
Mollusk fauna of Philadelphia and environs . . . 133 
Mulinia from the Pacific Coast . . . . .5,41 
Mulinia Gray ......... 27 
Mulinia gabbi Tryon . . . . . . 4, 42 
Mulinia modesta Dali, n. sp. (PI. I). 5, 41 
Mulinia coloradoensis Dali, n. sp. (PI. I). . . 6, 41 
Mulinia coloradoensis var. acuta Dali, n. var. (PI. 1). . 6, 41 
Mulinia Bradley Dali, n. sp. (PI. I). 6, 41 
My daily walk ......... 33 
Navanax n. gen. (Navarchus being preoccupied) . . 131 
New American freshwater shells ..... 114 
New method of preventing cracking of Anodons . . 57 
New species of land shells from the Galapagos Islands . 126 
New publications . . . 28, 83, 96, 107, 119, 131, 144 
New species of land shells from Puget Sound . . . 129 
Notes and news 12, 24, 35, 48, 57, 71, 82, 95,106, 118, 130, 143 
Notes on the reported extinction of the genus Achatinella 
and marvelous development of a Florida Faseiolaria. 123 
Olivella, a new variety of (O. gracilis var. Gaylordi Ford). 
(PI. II). 103 
Orthalicus of Florida ....... 37, 57 
Patulastra? (Punctum?) pugeteusis Dali, n. sp. . . 130 
Perostylus, a new genus of Fusoid gastropod ... 17 
Perostylus Brazieri Tryon ....... 17 
Perostylus Fordianus Pilsbry ...... 18 
Perostylus the embryo of Megalatractus .... 67 
Pisidia, two new (Pisidium cruciatum Sterki ; P. punctatum 
Sterki). (PI. II) .97, 99 
Pisidia, on collecting . . . ... . . 113 
Planorbis alabamensis Pilsbry, n. sp. . . . . 114 
Planorbis bicarinatus aroostookensis Pilsbry, n. var. . . 115 
