The Moller Prohe-Platte, By J. Edwards Smith. 241 
we must regard the measurement of No. 18 by lamp as little less 
than a feat. 
Measueement of 
1. Triceratium favus 
2. Pinnularia nohilis 
3. Navicula lyra 
4. Navicula lyra 
Numbers 
counted. 
4 .. 
4 .. 
4 
14 .. 
15 .. 
18 .. 
18 .. 
24 .. 
25 
29 ., 
31 ., 
.. 36 ., 
36 ., 
36 .. 
36 
5. Pinnularia interrupta 20 
19 
6. 8. Phoenicenteron . . 
9. 
10. 
Gramm. marina 
P. Balticum ., 
P. accumenata 
Nitzschia ampTioryx 
17. 
18. 
19. 
20. 
44 . 
44 . 
41 . 
57 . 
48 . 
50 . 
17 . 
52 . 
46 . 
20 . 
47 . 
58 . 
80 . 
51 . 
48 . 
37 . 
63 . 
64 . 
64 . 
46 . 
42 . 
40 . 
16 . 
20 . 
20 . 
24 . 
19 . 
35 . 
31 . 
Navicula crassmervis 47 . 
24 . 
37 . 
Nitzschia curmla .. 50 . 
? 
Amph. pellucida . . 42 . 
43 . 
11. P. angulata .. 
12. G. suUil. .. . 
13. Surirella gemma ., 
14. Nitzschia sigmoidea 
15. P.fasciola 
16. Surirella gemma 
Gym. elliptica 
Moller Pkobe-Platte, No. 258. 
Lines 
in 1-100& 
Eng. inch. 
centre to centre of hexagons 3 • 06 
.. 3-08 
3-08 
at edge from centre top 10-8 
„ „ bottom 10*5 
midway from centre to end . . , . top 12 • 5 
„ „ .. bottom 12 '1 
from centre along axis , top 16*3 
„ „ .... bottom 17*1 
short lines between marginal .. .. top 17 '3 
„ „ .. bottom 18*5 
from centre along axis top 25 ■ 0 
„ „ .... bottom 25-0 
short lines top 27 • 1 
„ bottom 27-1 
along each edge from centre . . . . top 26 • 8 
„ „ bottom 25 '5 
along axis top 33 • 
„ bottom 32-7 
along edge top 31 • 1 
36-3 
near end 32-9 
including middle 34 * 3 
longitudinal 31-5 
including middle along axis 42 • 7 
„ „ convex edge 42 • 9 
„ „ concave edge 45-3 
diagonal near centre (angles of diagonals 
58°) .. 43-8 
61-7 
61-2 
at axis from centre 54 * 8 
at edge 51*4 
longitudinal .. .. 63*5 
including middle 63 • 0 
» )» 63 "3 
»> 5j 63 "2 
56-5 
56-2 
55-5 
near middle of length 64 • 2 
63-0 
64-4 
almost half-way from middle to end 67 '3 
nearer to end than middle 70 * 4 
along edge from centre 63*3 
(probably was 30— doubtful) 65 " 1? . 
82-2 
81-1 
79-4 
84-7 
(counted number not given J. E. S.) .. 84*5 
counted three times 92 * 9 
j> » 92*7 
