THE NAUTILUS. V" 



Lymnaea stagnalis lillianae Baker, n. var 112, 125 



Lymnaea umbilicata, range of 80 



Maeroceramus hendersoni Torre, n, sp. (PI. 4, fig. 5) . . . 49 



Mexico, Mollusks from northeastern 45 



Mitra (Chrysame) waltonensis Aldr. n. sp. (PI. 11, fig. 1) 121 



Mitsukuri, Dr. Kakichi 120 



Mnsculium parvum Sterki, n, sp 67 



Museulium, observations and notes on 17 



Musculium winkleyi Sterki, n. sp 66 



Nudibranchs, notes on New England 33 



Nudibranehs, rectification of the nomenclature 100 



Odostomia (Evalea), cookeana Bartsch, n. sp 138 



Odostomia (Evalina) katherinae Winkley, n. sp. (Fig.). 88 



Odostomia sulcosa 62 



Oklahoma, mollusks from 91 



Olivella porteri Dall, n. sp 133 



Onoba asser Bartsch, n. sp 138 



Pachypoma lithophorum Dall, n, sp 135 



Pachypoma magdalena Dall, n. sp 135 



Paladilhia Bgt 47 



Paludestrina protea Gould 78 



Parreysia, Systematic position of 139 



Pisidium marci Sterki, n. sp 42 



Planorbis bicarinatus Say. (PI. 1, fig. 3) 21 



Planorbis bicarinatus var. augistomus Hald. (PI. 1, figs. 



4, 5) 4 



Planorbis bicarinatus var. aroostookensis Pils. (PI. 1, 



figs. 1, 2) 7 



Planorbis bicarinatus var. corrugatus Currier, (PI. 1, 



fig. 10) 5 



Planorbis bicarinatus var. percarinatus Walk., n. n. (PI. 



1, fig. 12) 6 



Planorbis bicarinatus var. port.agensis Baker, (PI. 1, 



%. 9) 8 



Planorbis bicarinatus var. royalensis Walk., n. v. (PI. 1, 



fig. 11) 9 



Planorbis bicarinatus var. striatus Baker 7 



