ENTOMOSTRACA. 205 



carries an egg-bag externally, one on each side of the body. 

 '' M. Jurine instituted some experiments upon the C, quad- 

 ricornis, to see how far this power (of reproducing mutilated 

 members) existed in this family. In his first attempts he failed, 

 the animals having died before they moulted, and without 

 showing any cliange in the mutilated members. At length 

 however he succeeded. He cut ofP about two-thirds of an 

 antenna of a female, which lived and moulted, reappearing 

 after moulting with beautiful, perfect, new antennse, the old 

 one of the cast shell not having shown the least indication 

 of a change." '' Some authors have asserted that these 

 insects possess a wonderful power of resisting drought, and 

 that when, by reason of the summer heats, the marshes be- 

 come dried up, the little creatures do not die, but as soon 

 as the mud is again moistened by the rain they recover en- 

 tirely. Jurine doubted this, and commenced a course of 

 observations to prove that they have not this faculty. He 

 selected twelve of the Ci^ clops quadricornis, removed them 

 out of the water, and allowed them to remain fifteen minutes 

 dry ; seven of them he found to be irrecoverably dead, the 

 remaining five revived. Again he selected twelve others, and 

 allowed them to remain twenty minutes dry; eleven out of 

 the twelve died. A third time he selected twelve, and after 



