DEEP SEA FISHES 63 



stance, with huge heads and dwarfish bodies, and an- often provided with 



illuminating organs like little electric bulbs, which can be "shunted off Or 



on" by the fish, and enable the fishes either to see their neighbors or to 



attract, their prey. A group representing a number of these fishes as they 



are supposed to appear in the gloom <>f the profound depths, lit up only by 

 their luminous organs, is shown in an enclosure next to the Paddlefish 

 Group mentioned above. 



The cases should be examined in the order numbered (beginning with 



14); and one may pass in review the catfishes, carps, eels, trout, salmon, 

 pike, mullets, mackerel, basses, wrasses, drunifish, sculpins, cods, flatfishes 

 and anglers. 



Before the visitor has completed his review r of the gallery, he should 

 examine the three wall-cases which explain the characteristic structures 

 of fishes of different groups, and the way in which the groups are related 

 to one another. In one of these wall-cases various kinds of fishes have 

 been arranged in a genealogical tree, and the lines and labels give an idea 

 of their evolution. 



Among the conspicuous exhibits of the gallery one notices a sun-fish 



^ e* * ■> (Mola), which is the largest example of which we have any 



Ocean Sunfish . ° . * / 



exact record (it is 10 ft. 2 in. from tip to tip) ; also a 12 ft. 



9 in. thresher shark, and a gar pike, 7 ft. 4 in. long. 



In the window are groups showing the shovel-nosed sturgeon, and 

 Window the spawning habits of the bowfin and of the slender-nosed 



Groups garpike. 



An exhibit of fossil fishes is to be found on the fourth floor. 



[Return to the elevators.] 



