74 REPORT OP COMMISSIONERS OF INLAND FISHERIES. 



Second Stage. 



The external changes which mark the entrance to the second stage 

 concern chiefly the changes which take place in the antennae and in 

 the abdominal segments: 



1. Dorsal surface of cephalo-thorax not as convex as in first stage. 



2. Eyes somewhat less large and prominent. 



3. The inner branches (endopodites) are developing from the 

 exopodites of the first pair of antennae. 



4. The endopodites of second antennae increased slightly in 

 length. 



5. The thoracic appendages have shifted in respect to their body 

 origin to a more anterior position. 



6. The legs, chelipeds, and maxillepeds are still fitted with swim- 

 ming exopodites. 



7. From the under side of the 2nd, 3rd, 4th, and 5th abdominal 

 segments have developed swimmerets. 



8. Tail-fan of same appearance. 



9. Average length of second stage is 9+ mm. 



Third Stage. 



The change manifested in the shifting from the second to the 

 third stage also concerns chiefly the antennae and the abdominal 

 segments : 



1. Dorsal surface of cephalo-thorax but slightly curved. 



2. Eyes relatively smaller for size of body. 



3. The inner branches of the first pair of antennae about equal in 

 length the outer branches. 



4. The exopodites of second antenna? have increased slightly in 

 length. 



5. The thoracic appendages have undergone a further forward 

 shifting. 



