46 TI1K NAUTILUS. 



No. 224. Vertigo ventricosa (Morse), common. 



No. 224a. Vertigo ventricosa var. elation, (Sterki), rare. 



This species is noted in the catalogue as from Ohio, Michigan and 

 Minnesota. 



226. Vertigo bollesiana (Morse), rare. 



260. Vitrea hammonis (Strom), rare. 



264. V. binneyana (Morse), common. 



268. V. ferrea (Morse), common. 



278. Euconulus f'ulvus (Mull.), common. 



283. Zonitoides arboreus (Say), abundant. 



293. Z. exiguus (Stimp.), common. 



494. Z. mil in in (Morse), rare. 



338. Pyramidula alterrfata (Say), abundant. 



344. P. striatella (Anth.), abundant. 



346. Helicodiscus lineatus (Say), common. 



248. Punctum pygmaeum (Drap.), common. 



353. Sphyradium edentulum (Drap.), rare. 



362a. Succinea obliqua totteniana (Lea), common. 



367. S. avara (Say), not common. 



The Pupa muscorum L. was found in a most interesting situation. 

 On the seaward side of the island, on a rough, stony beach, rises a 

 pinnacle of rock many tons in weight. This is nearly fifty feet high 

 and is separated from the main cliff by about forty feet. I climbed 

 one day to a flat place near the top, three feet square, covered with 

 Juniper bushes, to gather some wild bluebells, Campanula rotundi- 

 folia L., and while clinging in this narrow space, picked over the 

 valves of clams and mussel shells brought by Crows. Needless to 

 say, I was inspired to find hidden in the lower shells, deep in the 

 bushes, quite a colony of Muscorum. This is the only place on the 

 island where this species is found, and a careful search on the adja- 

 cent cliffs revealed no more of them. How they could have got 

 there is of course an interesting problem. Two fresh-water species 

 are found on the island. Pisidium abditum (Hald.) and Lymnsea 

 caperato. Say, and the following land-shells have been found on 

 neighboring islands. 



13. Helix hortensis Mull, Little Duck Island, common. 



106. Polygyra sayii (Binn.), Hancock Point. 



180. Strobilops labyrinthica (Say), Sovvard's Island, common. 



254. Vitrina limpida Gld., Calf Island, common. 



