'^11 ILLUSTRATIONS. 



Devices for use in fish hatcheries and aquaria: 



Fig. I. Design for artificial pond with siphoid outlet iq^.J 



2. A siphoid outlet for hatching and rearing troughs ' ^ " '_ jo,„ 



3. Apparatus for cleaning hatching or rearing troughs ' joZj 



4. Cleaning device for ponds and aquaria ^ 



5. Oxygenator and vacuum producer ~ 



6. Scraper for preparing fish food 



FiSHWAYS: 



Fig. I . Roberts 



..Smith '°« 



3. Wheeler '"'^^ 



4. steck ::.■::: '°« 



'l"''" ■:::::::::::::::::::::::: ZU 



6. Rogers 



_ , 1046 



7. Bracket \ 



„ c 1046 



o. Swazey 



„ 1047 



9. Brewer 



lo.Shaw '"'^^ 



, ,. 1047 



1 1 . Atkins ^ ' 



12. Richardson 



13. Hockin 



14. caii :::::::: '°*9 



15. McDonald '°'^^ 



16. McDonald '°^° 



17 Cam^rd '°5° 



18. Kirk '°5i 



„ , 105 1 



19. Recken 



JOS'* 



20. Improved Cail 



1053 



21. Adaptation of improved Cail fishway, constructed of concrete ios6-ios7 



Habits and life history op the toadfish, Opsanus tau: 



Diagram showing adhesive disk of toadfish egg „ 



Methods of STUDYiiNO the habits of fishes: 



Fig. I. Longitudinal section of reflecting water glass 



2. Reflecting camera, shown in section .7 . . . . 



3. Nest of horned dace, diagram in section ^ 



4. Diagram showing ceremonial behavior of horned dace 1 128 



5. Male and female horned dace during spawning act ' , , ^^ 



An intensive study of the fauna and flora of a restricted area of sea bottom: 



Fig. I. Map showing Woods Hole region and adjacent portions of New England coast i .37 



2. Chart showing temperature throughout Buzzards Bay and Vineyard Sound in Au- 



gust 



" 1 238 



3. Chart showing temperature throughout Buzzards Bay and Vineyard Sound in 



March 



4. Chart showing density throughout Buzzards Bay and Vineyard Sound in August . . i ^40 



5. Local distribution of the gastropod mollusk Tritia trivittala ,,4, 



, 6. Local distribution of the polycha;tous worm Nereis pelagica 1 242 



7. Local distribution of the polychatous worm Clymciiella torquata ' ^ ^ 1243 



8. Local distribution of the bivalve mollusk Yoldia limalula 124. 



9. Local distribution of the sertularian hydroid ThiUaria argentea 1245 



10. Local distribution of the common skate, Raja eiinacca jLg 



11. Local distribution of the " window-pane" flounder, Lophopsetta maculata '.'. 1247 



12. Showing localities at which the oyster, Ostrca virginica, or its shells, were taken. . . .' . . 1248 



13. Local distribution of the bivalve mollusk Vcncricardia borealis ' ' ' ' 1249 



14. Local distribution of the actinian Alcyonium carncum ' ^ j' (^ 



