ILLUSTRATIONS. 
J- 
PLATES. 
Review of salmonoid fishes of Great Lakes: Facing page. 
Plate I. Lake trout, Mackinaw trout (Cristivomer namaycush) x 
II. Lake Huron herring (Leucichthys sisco huronius) 42 
III. Bloater of Lake Michigan (Leucichthys johannae) 42 
IV. Blackfin of Lake Michigan (Leucichthys nigripinnis) 42 
V. Cisco of Lake Michigan (Leucichthys hoyi) 42 
VI. Common whitefish of Lake Erie (Coregonus albus) 42 
VII. Menominee whitefish, round whitefish (Coregonus quadrilateralis) 42 
Barnacles of Japan and Bering Sea: 
Plate VIII. (1-4) Scalpellum rubrum. (5-7) Conchoderma auritum 61 
IX. (1) Scalpellum stearnsi. (2-4) Scalpellum gonionotum. (5-7) Scalpellum 
weltnerianum 84 
X. Scalpellum japonicum 84 
XI. (1-3) Scalpellum japonicum biramosum. (4, 5) Scalpellum molliculum. 
(6, 7) Octolasmis orthogonia. (8, 9) Heteralepas, species undetermined.. 84 
XII. (1-3) Heteralepas vetula. (4) Balanusrostratusapertus. (5) Balanus callisto- 
derma. (6) Balanus rostratus. (7) Balanus rostratus apertus 84 
XIII. ( 1, 2) Balanus rostratus apertus. (3-7) Balanus hoekianus. (8, 9) Balanus 
rostratus apertus 84 
XIV. Balanus crenatus 84 
XV. ( 1, 2) Balanus hoekianus. (3-7) Balanus callistoderma 84 
XVI. Acasta spongites japonica 84 
XVII. Pachylasma crinoidophilum 84 
Food value of sea mussels: 
Plate XVIII. (1) The sea mussel (Mytilusedulis Linnaeus). (2) A bed of sea mussels 1 year 
old 87 
XIX. (1) Interior surface viewof the mantle of a male mussel. (2) Interior surface 
view of the mantle of a female mussel. (3) Lateral viewof a mussel with the 
shell and mantle of one side removed. (4) Lateral view of afemale mussel 
with the shell and mantle of one side and the foot, gills, and abdomen 
removed to show the main canals of the genital system 128 
XX. Organisms constituting the food of mussels. Diatomaceae 128 
XXL Organisms constituting the food of mussels. Diatomaceae 128 
XXII. Organisms constituting the food of mussels. Protozoa 128 
XXIII. (1) Cross section of the mantle of a female mussel March 3, 1908. (2) Cross 
section of the mantle of afemale mussel August 20, 1907. (3) Cross section 
of the mantle of a male mussel June 27, 1908. (4) Cross section of the mantle 
of a spent female sea mussel August 16, 1908 128 
XXIV. (1) A mussel bed at Menemsha Pond, Marthas Vineyard, Mass., exposed 
at low tide. (2) Dredging for mussels 128 
XXV. (1) A heap of mussel shells, the result of a few days’ work. (2) A heap of 
shells from mussels which have been pickled for the New York market. . 
v 
128 
