NATURAL HISTORY OF AMERICAN LOBSTER 
335 
cord, motor and sensory elements, as well as the complex stomato-gastric system, have 
essentially the same relations as are found in an adult animal. 
Natural food of the larva . — It is not to be doubted that the incessant activity of this 
larva, which apparently knows no rest day or night, is needed, as Mead remarks to 
Fig. 40.— Swimming attitudes of young lobsters in the first free stages; a, lobster swimming with body bent in the 
usual quadrant form, the head directed downward and often at a greater angle; the swimming branches (and the perma- 
nent limbs rather more than here shown) directed backward, in “posterior” position of Hadley; resulting movement 
upward and backward; b, young lobster playing cannibal, swimming astride the carcass of another, which it has nipped 
at the junction of the carapace and abdomen and holds with its prehensile legs; c, swimming with the thoracic legs 
directed forward; in “anterior” position of Hadley; resulting movement upward and forward; d y rising position 
occasionally assumed; e, slowly moving or “floating” position sometimes observed; /, lobster “standing on head,” 
apparently probing the bottom with rostrum, but really too weak to rise. 
bring them into contact with the minute suspended bodies upon which they feed. All 
the rearing experiments that have been conducted by Mead and others with any degree 
of success during the past 15 or 20 j^ears, whether in Europe or the United States, have 
clearlv shown that the larvae must have their food suspended and in fine particles; the 
