LIST OF ILLUSTRATIONS. 
Plate. 
Page. 
1. Map of Lake Washington, Wash., showing Soundings in feet 
2. Lake Sammamish, near Seattle, Wash., showing Soundings taken by H. S. Pish Commission 
3. Map showing legion of Woods Hole, Mass 
4. Map showing Location of Salmon Weirs and Traps fished in Tenobscot River and Bay 
5. (1) Chinook or Quinnat Salmon ( Oncorhynchus tschaioytscha). (2) Atlantic Salmon ( Salmo salar). (3) 
Steelhead Trout ( Salmo gairdneri ) - 
6. (1) Ictalurus anguilla. '(2) Notropiswelaba. (3) N otropis hudsonius 
7. (4) Signalosa atcliafalayce. (5) Alosa alabamce , male. (6) Alosa alabamce, female. (7) Gorytliroichthys 
cayorum - 
8. (8) Gottogaster cheneyi. (9) Dermatolepis zanclus. (10) Anisotremus surinamcnsis 
9. (11) Lyosphceraglobosa. (12) Lyosphceraglobosa, young. (13) Lophogobius cyprinoides. (14) Ogilbia cayorum . 
10. (1) Lake I.amprey ( Petromyzon marinus unicolor). (2) Brook Lampreys ( Lampetra vjilderi ), a, male; b, 
female. (3) Pickerel (Lucius reticulatus) and Sucker (Catostomus commersonii) with Lamprey Scars. (4) 
Lake Lamprey clinging lo the Sucker 
11. (1) A dozen Catfish (Ameiurus nebulosus ) fatally attacked by Lake Lamprey ( Petromyzon marinus unicolor). 
(2) EightCatfisli (Ameiurus nebulosus) fatally attacked by Lake Lamprey .. 
12. Sheepswool Sponge 
13. (1) Sheepswool Sponge from Matecumbe Key. (2) Sheepswool Sponge from Florida Keys 
14. Cluster of connected Sheepswool Sponges 
15. (1) Sheepswool Sponge from Florida Keys. (2) “ Wire” or “ Bastard ’ Sheepswool Sponge 
10. Sheepswool Sponges 
17. Sheepswool Sponges artificially grown from Clippings 
18. Velvet Sponge 
19. Yellow Sponge 
20. Yellow Sponge from Matecumbe Key 
21. Yellow Sponge from Florida Keys 
22. (1) Yellow Sponge locally called “Hardhead" ; (2) Yellow Sponge from Biscayno Bay 
23. Yellow Sponge from Anclote Keys - 
24. Grass Sponge from Matecumbe Key 
25. Grass Sponge from Florida Keys, two views 
26. Grass Sponge locally known as “ Niggerliead," two views 
27. Grass Sponge from Anclote Keys 
28. Grass Sponge containing a large piece of Coral in depression, two views 
29. Grass Sponges from Anclote Keys . 
30. Glove Sponges from Florida Keys 
31. Glove Sponge from Florida Keys 
X. Shells of Fresh-water Mussel (Unio crassidens) 
11. Fresh-water Mussel, showing Pearl included between Mantle and Shell 
III. (1) Dipsas plicatus, interior and exterior, interior containing tinfoil figures' of Buddha; (2) Dipsas plicatus, 
containing three strings of beads with a pearly coating 
IV. Salmon-colored Pearl, weighing 14J pearl grains, lying loose where it was formed in a shell, four views 
V. Interior and exterior views of Shell, showing barrel-shaped adhering Pearl of large size 
VI. A typical Hnio of the Mississippi Valley type, showing exterior of Right Valve and interior of Left Valve.. 
VII. Left Valve of Unio rectus , outside and inside views 
VIII. Sterling Silver Teapot 
IX Evolution of a Pearl Button 
X. (1) Hollow pearl made by Chinese, by scaling off a layer from a large Oval Pearl and filling it witli a compo- 
sition of hard wax or shellac to strengthen it ; (2) Irregular and Button-shaped Pearls 
XI. Encysted Pearls and Pearls with Marked Interiors 
XIl. Same as preceding page, but showing Exterior Sides 
XIII. Pearls presenting the aspect of having been turned in a Lathe — i. c., with one or more regular Ridges or 
Furrows running completely around them 
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