260 CRUSTACEA, ECHINODERMS, ETC. 



Fig. 191. 



(d and e), of the great claws (g\ and the bilobed 

 tail (m), are plainly visible, as well as the most im- 

 portant of the internal organs, such as the heart (/), 

 intestines (/), &c. On hatching, the second con- 

 dition, called the my sis stage because it then 



resembles the adult condi- 

 tion of the opossum shrimp, 

 or Mysis is next under- 

 gone. The young lobster 

 is now about one-third of 

 an inch in length, and, as 

 will be seen in Fig. 190, 

 possesses six pair of legs, 

 one pair being subse- 

 quently modified into foot- 

 jaws. In the third stage, 

 when the larva has at- 

 tained a length of about 

 half an inch, it loses its 

 mysis-Y\ke appearance, and 

 begins to assume some- 

 thing like its adult features. 

 In the mysis condition it 

 swims on or near the sur- 

 face of the water ; and even 

 in the next stage is more 

 or less of a free swimmer, these habits not being left 

 off until after several succeeding stages of its develop- 

 ment. At present it will be seen from Fig. 191 that 



Back view of fig. 19- 



