ENTOMOSTRACA. 207 



As, when seen in the adult state, the LerneadcB are always 

 immovably fixed upon the fish upon which they feed, their 

 motions are principally of a secondary nature. With the un- 

 happy fish, it is true, they are moved about briskly enough 

 from place to place, but on the fish their motions must be 

 very confined ; for in their case 



" The labours of a mortal life " 



consist simply in drawing in their food and propagating 

 their kind. 



An interesting question here arises, as to the means by 

 which they originally obtained their position? For they 

 have no feet or swimming organs to propel them, and no 

 eyes to show them the way. The answer to this question 

 consists in the fact, that in their young state they are differ- 

 ently constituted, and possess an eye, and in some degree 

 the power of locomotion. " When they first come out of 

 the Q^^^ they are of an oval shape, and very much resemble 

 the young of the Cyclo^ndcB, They possess a large eye, 

 situated in the centre of the anterior and upper part of the 

 body, and are provided with two pairs of swimming feet and 

 a pair of jointed antennae. As in the Cyclojndce, the young 

 Lerneadce cast their skin repeatedly before they arrive at 



