THE NAUTILUS. 127 



52. Vivipara intertexta Say. D. 



53. Limncea megasoma Say. The only station for this species in 

 this vicinity, so far as known, is a small lily-pond in the bed of the 

 Mississippi River just below St. Cloud. Is was discovered here a few 

 years ago by Prof. Hublmrd of the St. Cloud State Normal School. 

 The snails are to be seen floating on the surface or feeding upon the 

 lily-leaves. They are shy, sinking almost instantly when alarmed. 



54. Limnwa stagnalix L. C, H, B, feeding upon weeds. R, 

 found putrifying at the roots of grass in slough near the river. 



55. Limncsa emarginataS&y. C. Two quite distinct varieties of 

 texture were taken. One corneous, translucent and rather thin in 

 both young and adult specimens; the other nearly white, opaque 

 and heavier, with much thickened margin. Both forms were plen- 

 tiful and near together. One was found on the pebbles, the other on 

 the sandy bottom. 



56. Limmra gradlis Jay. After finding dead specimens of this 

 beautiful species in Belle Lake, I was told by Prof. Hubbard that 

 he took it alive in Heath Lake the previous fall upon the under 

 side of lily-leaves. Later a thorough search was made for them in 

 the same original locality, but only two dead specimens were found. 

 Query where do they keep themselves in summer? 



57. Limncea reflexa Say. C, B, S. 



58. Limiuca refie.ra zebra Tryon. B. 



59. Limncea columella Say. R. 



60. Limmra catascopium Say. M. 

 01. Lim iKi'n rttjierata Say. S. 



62. Limnaea palwtris Mull. R, on slough grass ; D. 



63. Liiunii'ii liiniiilis Say. C, B, M, F. 



64. Limn /fa desidiosa Say. C, B, M, F. 



65. Aplf.cn hyjtnornni L. R, T, S. 



66. Physa gyrina Say. D, F, B, M. 



67. Physa Integra Hald. St. Cloud, Minn. ; I). 



68. Phi/sa olracea Tryon. D. 



69. Phi/sa ri iiosa Gld. F. 



70. Plunorbix ramjjanulatus Say. Abundant everywhere. 



71. Pfnnorbix blr-nriiiatua Say. Abundant everywhere. 



72. Planorbis trii-olris Say. Abundant everywhere. 



73. Planorbix f.r<irntnx Say. C, B, R, F, H. 



74. Planorbix Jurxiitus Gld. C, B, T, F, H. 



75. Planorbis umbilicateUits dull B. 



