VIII ILLUSTRATIONS. 
Facing page. 
A NEW PRINCIPLE OF AQUICULTURE AND TRANSPORTATION OF LIVE FISHES—Continued. 
Plate XCIX. (19) Detail of propeller shaft couplings. (20) Detail of gears on float at 
junction of transverse and longitudinal shafts....................--- 
C. (21) Detail of device for throwing propeller in and out of gear. (22) 
Operation of device for throwing propeller out of gear................ 
APPARATUS AND METHODS EMPLOYED AT THE MARINE FISH HATCHERY AT FLODEVvIG, NoRWAy: 
Plate CI. (1) Egg collector. (2) Eccentric wheel providing circulation of water 
Att hatching OES Aas to yercteth ete cebtauekeerhae cE EMN CS Rote eden Tate: elisceyecot 
CULTIVATION OF THE TURBOT: 
Plate CII. (1) Turbot eggs with embryo. (2) Larva with vitellus. (3) Larva with 
vitellus almost entirely resorbed—beginning of critical period......... 
CIII. (4) Larva a few days after end of critical period. (5) Detail of pigmen- 
. tation of abdomen of above figure. (6) Larva after critical period.... 
NEW AND IMPROVED DEVICES FOR FISH CULTURISTS: 
Plate CIV. (1) Artificial bass nest. (2) Bass fry retaining screen and trap. (3) 
Collecting stabs withvoatian sm cave chante musts mister meieyes<toos mt excite ereeiae 
CV. (4) Fish retainer, with float. (5) Fish attendant’s outfit—aerator screen, 
plunger, combinedace piekvand Scam Teter nrsjectie al gies vice eer 
CVI. (6) Seine for collecting fingerling bass. (7) Shipping case for fish eggs. . 
HABITS AND LIFE HISTORY OF THE TOADFISH, OPSANUS TAU: 
Plate CVII. (1) Reproductive organs of the toadfish. (2) Ventral aspect of ripe ovary. 
CVIII. (3) One-half of Pinna shell nest, showing live eggs in segmentation. (4) 
Beggs in late sepmentationy ujarscrc easel sysmrsie are oie jcartan wa etter Ne ater 
CIX. (5) Board nest, eggs with late blastoderm and early embryos. (6) Nest 
showing embryos having marked enlargement at one end............ 
CX. (7) Pinna shell nest, showing tadpole-like larve. (8) Board nest. 
Larvee shiphtly, ioldervthan in pure ye se eemarcai sere estate 
CXI. (9) Pinna shell nest, late larval toadfish. (10) Late larval toadfish, show- 
np Colorinar kanes sacle ante aiee ene ie tol ele eee 
CXII. (11) Same nest as figure 10, The young nearly ready to break away. 
(12) From instantaneous photograph of free-swimming young toadfish 
AT WATER. .'a cise teased a jaehatmie se clataie ws caslaenes eis cter ieee e iaieters eter aes 
CXIII. (13) Larval toadfish, showing formation of color bands and disappearance 
METHODS OF STUDYING THE HABITS OF FISHES AND RECORDING THEIR LIFE HISTORIES: 
Plate CXIV. (1) Water glass designed for observation or photography of objects under 
water. (2) Two-foot water glass supported on four legs and provided 
with screen, as used for studying and photographing lampreys........ 
CXV. (3) Reflecting water glass. (4) Male of common shiner, photographed in 
aqtaritim Onto dOors sae automa Ary ciate re eet aaa tere acta etn 2 
CXVI. (5) Photograph of nest of black bass, taken with aid of screen, camera 
above water. (6) Brook lampreys on nest, photographed through 
water glassinuMaingWwateniia. asi cieicnceilskuel ines tarkos eS relis ere 
CXVII. (7) Galvanized iron box with plate-glass front, designed to contain camera 
when used under water. (8) Photograph showing method of using 
reflecting camera when inclosed in water-tight box for subaquatic 
1:0)? SERS ER MTR RUNS Rae CMA AO EOS 8) tc, oie cen ST Babs oR pe LA 
CXVIII. (9) Photograph of nest of a horned dace, taken with reflecting camera and 
by aid of a cloth screen. (10) Male and two females of horned dace, 
photographed in aquarium out of doors. ........... sees sees ee eee 
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