312 
Hl'LLETIN OF THE NATURAL HISTORY SOCIETY. 
EXPLANATION OF PLATE. 
The forms represented in the Plate are only rough sketches 
and are not drawn to scale. They make no claim to artistic 
merit; means of accurate representation, and especially of 
reproduction, not being available to the author. They are 
intended mainly to enable local students to identify at least 
the genera of the forms most commonly met with in the waters 
of New Brunswick. For more exact drawings of these and 
other species it will be necessary for the student to consult 
standard works. The figures given are as seen with a one- 
quarter inch objective, and the magnification is about 500. 
1 
Navicula maculata 
24 
Diatoma vulgare 
9 
Navicula smithii 
25 
Diatoma elongatum 
3 
Navicula elliptica 
26 
Himantidium arcus 
4 
Navicula trinodis 
27 
Himantidium undulatum 
5 
Navicula viridis 
28 
Pleurosigma attenuatum 
6 
Stauroneis phoenicenteron 
29 
Cocconema lanceolatum 
7 
Stauroneis acuta 
30 
Cocconema cistula 
8 
Navicula nobilis 
31 
Cymbella gastroides 
9 
Surirella biseriata 
32 
Epithemia zebra 
10 
Surirella gemma 
33 
Synedra radians 
11 
Surirella ovata 
34 
Synedra ulna 
12 
Stauroneis anceps 
35 
Fragillaria Harrisonii 
13 
Amphora ovalis 
36 
Fragillaria 
14 
Nitschia sigmoidea 
37 
Cocconeis Placentula 
15 
Nitschia sigmoidea 
37 
Epithemia turgida 
10 
Tabellaria flocculosa 
39 
Melosira subflexilis 
17 
Tabellaria fenes^rata 
40 
Melosira varians 
19 
Gomphonema capitatum 
41 
Encyonema coespitosum 
18 
Gomphonema geminatum 
20 
Navicula amphigampus 
42 
Surirella ovalis 
21 
Eunotia monodon 
43 
Surirella splendida 
22 
Eunotia diodon 
44 
Synedra pulchella 
23 
Eunotia tetraodon 
45 
Odontidium 
