THE PAN-AMERICAN EXPOSITION. 309 
Gill nets: 
Gill nets of various sizes and types, similar to those employed in the commercial 
fisheries, are used in collecting and determining the nature of the fish life in waters 
in which other kinds of apparatus can not be so conveniently or effectively employed. 
Dip nets, scrape nets, ele.: 
Various forms of hand nets, intended to be used from boats, wharves, or shores, 
are required in collecting small fishes and invertebrates that are swimming in the 
water, resting On the bottom, or attached to piling, rocks, ete. 
Collecting tank and chest: 
For use in the field and in shipping collections the Commission has adopted a 
stout chest with handles and padlocks. The chest accommodates one 16-gallon tank, 
two 8-gallon tanks, or four 4-gallon tanks, made of sheet copper with tightly fitting 
screw tops. 
Maps, CHARTS, AND ILLUSTRATIONS. 
Ten charts to illustrate the geographical distribution of the important food-fishes of 
the Great Lakes: Common pike, sauger, small-mouth black bass, large-mouth 
black bass, lake trout, sturgeon, lake herring, muskallunge, w all- -eyed pike, 
common white-fish. 
One frame of plates from U. 8. Fish Commission publications illustrating the embry- 
ology of the common lobster. 
One frame of plates reproduced from photographs of living fishes from publications 
of the U. 8. Fish Commission. 
Four frames of colored plates of fishes from publications of the U.S. Fish Commission. 
Map of the United States showing location of scientific investigations made by the 
U.S. Fish Commission. 
Economic Mouuusca oF THE UNITED STATES. 
234. Flat razor-shell clam (Siliqua patula). Alaska to California. Used as food. 
235. Razor-shell clam (Knsis directus). Atlantic coast. Used as bait. 
236. Long clam, soft clam (Mya arenaria). Atlantic coast south to South Carolina. 
Used as food and bait. 
237. Platyodon cancellatus. California. 
238. Hen clam, surf clam (Spisula similis). Southeast coast United States. Used as 
food and bait. 
239. Hen clam, surf clam (Spisula solidissima). Atlantic coast. Used as food and bait. 
240. Alaska surf clam (Spisula planulata). Alaske 
241. Cuneate clam ( Gnathodon cuneatus). Gulf coast of United States. Used as food. 
242. Giant clam (7resus nuttalli). Pacific coast. Used as food. 
243. Donax levigata. Pacitic coast. Used in the manufacture of clam juice. 
244. Round clam (Savidomus aratus). California. Used as food. 
245. Round clam (Savidomus nuttalli). California. Used as food. 
246: Hard clam; quahog ( Venus mercenaria). Atlantic coast. Used as food and bait. 
247. Florida quahog ( Venus mortoni). Florida. Used as food and bait. 
248. Hard clam ( Venus simillima). California. 
249. Meretriv nimbosa. Florida. 
250. Tivela crassateloides. California. 
251. California little-neck clam (Tapes staminea). California. 
252. Deep-water clam (Cyprina islandica). Atlantic coast, south to New York. 
Occasionally used as food and bait. 
253. California cockle (Cardium corbis). Pacific coast. 
254. Florida cockle (Cardium robustum). Florida. 
255. Bloody clam (Arca pexata), Massachusetts to Mexico. Occasionally used as 
bait. 
256. Common mussel ( Mytilus edulis). Atlantic, Gulf, and Pacific coasts and Europe. 
Used as food and bait. 
257. California mussel (Mytilus californicus). Pacific coast. Used as food. 
258. Horse mussel (Modiolus modiolus). Pacific coast; Atlantic coast south to New 
Jersey; Europe. Used as food and bait. 
259. Ribbed mussel (Modiolus plicatulus). Maine to Georgia. Used as food and 
bait. 
260. Giant scallop (Pecten magellanicus). Labrador to New Jersey. Used as food. 
261. Pacific coast scallop (Pecten caurinus). Pacific coast. Used as food. 
262. Common scallop( Pecten irradians). Atlantic coast. 
263. Scallop (Pecten ventricosus). Pacific coast. 
