THE NAUTILUS. 127 
52. Vivipara intertexta Say. D. 
53. Limnea 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. Hubbard 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. Limnea stagnalis L. C, H, B, feeding upon weeds. R, 
found putrifying at the roots of grass in slough near the river. 
55. Limnea emarginataSay. 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. Limnea gracilis 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. Limnea reflexa Say. C, B,S. 
58. Limnea refleca zebra Tryon. B. 
59. Limneea columella Say. R. 
60. Limnea catascopium Say. M. 
61. Limnea caperata Say. S. 
62. Limnea palustris Mull. R, on slough grass; D. 
63. Limnea humilis Say. C, B, M, F. 
64. Limnea desidiosa Say. C, B, M, F. 
65. Aplexa hypnorum L. BR, T,S. 
66. Physa gyrina Say. D, F, B, M. 
67. Physa integra Hald. St. Cloud, Minn. ; D. 
68. Physa oleacea Tryon. D. 
69. Physa vinosa Glad. F. 
70. Planorbis campanulatus Say. Abundant everywhere. 
71. Planorbis bicarinatus Say. Abundant everywhere. 
72. Planorbis trivolvis Say. Abundant everywhere. 
73. Planorbis exacutus Say. C, B, R, F, H. 
74. Planorbis hirsutus Gld. C, B, T, F, H. 
75. Planorbis umbilicatellus Ckll. B. 
