VI THE NAUTILUS. 



Mexico, Notes on shells collected at Balsas . . .114 



Minnesota Mollusks, Records of 119 



Mitramorpha eocenensis Aldrich, n. sp. (fig.) . . .13 



Mollusca of Keene, New Hampshire 32 



Nason collection 10 



Nassa perpinguis var. bifasciata Berry, n. var. . . .39 



New England fauna, Shells new to the . . . .95 



New Mexico, Mollusks from around Albuquerque . . 103 

 Nitidella hendersoni Dall., n. sp. ..... 31 



Notes and news . . . .10, 33, 59, 71, 82, 95, 122 



Nudibrauch records, Two interesting New England . . 13 



Opisthobranchiata, Northern 23 



Palio lessonii 15, 16 



Paludestrina salsa Pils 53, 82 



Partulina mutabilis Baldwin, n. sp. . . . . .68 



Partulina winniei Baldwin, n. sp. ..... 67 



Pearl hunting in the Fox River, Illinois .... 122 



Petrasma Dall., n. subgenus of Solemya .... 2 



Pholadomya pacifica Dall., n. sp. . . . . 115, 142 



Physa sayi 19 



Pisidiuin in Massachusetts . . . . . . .113 



Planorbis bicarinatus . . . . . . . .122 



Planorbis bicarinatus portagensis Baker, n. var. . . .45 



Pleurobema tornbigbeanum Frierson, n. sp. (PL III). . 27 

 Polygyra inatermontana Pils. . . . . . .114 



Polygyra mooreana 66 



Publications received 34, 47, 83, 96, 122 



Pyrgulopsis wabashensis ....... 56 



San Diego, Mollusca dredged at ..... 134 



Scala, Another large miocene . . . . . .80 



Shells collected at Balsas, Guerrero, Mexico, by Walter E. 



Koch in Dec., 1908 114 



Showalter collection . . . . . . . .117 



Sicily, Shells of 128 



Sigaretus (Eunaticina) erectoides Aldr., n. sp. (PI. Y, figs. 



8, 9) . . . . . . . . . .75 



Solemya 1, 2 



Solemya (Acharax) bartschii Dall., n. sp. . . . .61 

 Solenomyacidse, A revision of the ... 1 



