Plate 26 
FIGURE 
1, 3, 5, 7, 9. Alcctrion fossatus Gould . 
2. Alcctrion mendicus Gould. 
Form. 
4. Alcctrion mendicus indisputabilis, n. subsp.. . . 
6. Alcctrion mendicus Gould . 
8. Alcctrion coo peri Forbes. 
10, Alcctrion tegulus Reeve . 
11, Alcctrion perpinguis Hinds. 
12, Alcctrion insculptus Carpenter . 
13, Alcctrion califorhianus Conrad . 
14, Alcctrion mendicus Gould . 
Form. 
15, Alcctrion obsoletus Say . 
16, 16a. Olivclla biplicata parva T. S. Oldroyd. . . 
17, 17a. Olivclla biplicata angelina T. S. Oldroyd 
18, 18a. Olivclla bociica diegensis T. S. Oldroyd. 
19, 19a. Olivclla bociica Carpenter . 
20, 20a. Olivclla biplicata Sowerby . 
Typical. 
21, 21a. Olivclla boctica mcxicana T. S. Oldroyd. 
22, 22a. Olivclla boctica Carpenter, Alaska . 
23, 23a. Olivclla biplicata fucana T. S. Oldroyd. . 
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