ILLUSTRATIONS. 
> 
PLATES. 
PHYSIOLOGY OF THE DIGESTIVE TRACT OF ELASMOBRANCHS: Page. 
Plate I. (1 and 2) Photomicrographs showing structure of the rectal gland in the smooth dogfish.............-..---- 28 
PHOTOGRAPHY OF AQUATIC ANIMALS IN THEIR NATURAL ENVIRONMENT: 
Plate II. (1 and 2) Photographs of fishes on coral reefs taken with camera submerged.............--.--.------------- 43 
III. (1) Photograph of the nest’ of a small-mouth black bass, taken with the aid of a screen, the camera above 
water. (2) Brook lampreys on the nest, photographed through water glass, in about 8 inches of running 
water... .<s2- ee ee Oe re oa ic es ec ees eee ln et a AE Ie os Ginna Tg eA Sa Sra 68 
IV. (1) Water glass to be used for observation or photography of objects under water. (2) Two-foot water 
glass supported on four legs and provided with sereen, as used for studying and photographing lampreys. -. 68 
V. (1) Photograph showing the method of using the reflecting camera when inclosed in the water-tight box 
for subaquatic work. (2) Galvanized-iron box with plate-glass front, to contain a reflecting camera when 
MSG UNG eri wAter ss oe oe saceee cnc smtsmes Saar ome geen was ae nee oe c paw ee otc Sewet ne dticneeasapsecane 68 
RELATIONSHIPS OF THE FISH FAUNA OF THE LAKES OF SOUTHEASTERN OREGON 4 
Maniantne lake rerion onson th easterd: OF8PON 2a) a. ~-ae nc caw ene Fo ae ae aaa we each acne sehen addsastoseccans 102 
FISHES OF THE SACRAMENTO-SAN JOAQUIN BASIN: 
Plate VI. Topographical map showing distribution of the Catostomid in the Sacramento-San Joaquin basin...... 148 
FISHES OF THE COASTAL STREAMS OF OREGON AND NORTHERN CALIFORNIA: 
Map showing distribution of fluvial fishes in the coastal streams of Oregon and northern California...............--....-. 189 
NATURAL HISTORY OF THE TEREDINID, OR SHIPWORMS: 
Plate VII. (1) Newly attached larva of Xylotrya gouldi. (2) Young shipworm of about 3 days’ attachment, from 
ventral side. (3) Specimen of about 1 week in the wood, slightly contracted, ventral view. (4) Same 
stage as figure 3, from left side 232 
VEN ey CALL GONE ACUI baw soso ee  eal ses wee 232 
IX. (7) Larva a few hours after attachment. (8) About the same stage as figure 2, from left side............. 232 
X. (9) Same as figure 4, the left shell, mantle, and gill removed. (10) Adult, anterior half of body........-.- 232 
XI. (11) Right shel valve of newly hatched larva, internal view. (12) Same, left shell valve. (13) Shell of 
newly attached larva. (14) Shell of shipworm that has been in wood about 1 day. (15) Left shell 
valve of specimen about 1 mm, long. (16) Left shell of specimen 5 mm. long. (17) Left shell valve 
? of large adult. (18) Front view of shell of adult. (19) Internal view of right valve. (20) Left pallet 
OU Sp SCNniG ry pn YON Py sae eae = aero ese ee a cence nae ee eee metas Pee cee eee so 232 
XII. (21) Dorsal gland of posterior part of the mantle. (22) Sagittal section of newly attached larva.......... 232 
XIII. (23) Transverse section of larva. (24) Horizontal section of newly attached larva......................-- 232 
XIV. (25) Transverse section of a specimen 1 mm. long. (26-30) A series of transverse sections of a specimen 
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XV. (31-33) Continuation of series of transverse sections in Plate XTV. (34) Section of pallet handle and its 
sheath. (85, 36) Diagrams of the posterior end of body of adult... ... Seen eee tan nae a = 232 
XVI. (37) Lamina of gill of Teredo navalis. (88) Transverse section of three laminse of Xylotrya gouldi......... 232 
XVII. (39) Tangential section of a gill of Xylotrya gouldi. (40) Transverse section of three gill lamina. (41) 
Section of the three most anterior gill filaments at side of ‘‘head.’’ (42) Group of cells from branchial 
groove at edge of gill. (43) Seetion of part of branchial groove that connects the two parts of the gill... 232 
XVIII. (45) Section of two tubes of the gland of Deshayes from a gilllamina, (46 and 47) Coarser and finer portions 
of the dendritic processes from the gilllamina of 7’eredo navalis represented in figure 37. (48-51) Four 
stages in the development of the structures of the second factor of the gland of Deshayes. . . 
XIX. (52) Heart of a specimen 2mm. long. (53) Heart of young adult. (54) Longitudinal section of the ven- 
tricle and vessels of a specimen 4 mm. long. (55) Longitudinal section of the anterior part of the 
ventricle and vessels of a specimen 10cm. long. (56) Group of cells from main portion of style sheath. 
(57) Same from tubular portion. (58) Group of cells from the liver...........-..-....2--2-----2---+-- 232 
XX. (59) Nervous system of newly attached larva. (60) Nervous system of adult. (61 and 62) Diagrams to 
show the relations of the ends of the kidneys, genital duct, pericardial cavity, and visceral ganglion... 232 
XXI. (63) Transverse section of anterior ganglion and genital duct. (64) Longitudinal section of genital duct. 
(65) Section of osphradium. (66) Tangential section of the osphradium..........-......-2+-..-....+ 232 
