and a large one on the 6th. Telson retaining deep 

 cleft with 7+7 spines (Fig. 4a). 



Mysis II (Fig. 5) still with no rostral teeth. 

 Dorsal spine on 5th abdominal segment either 

 missing or very small; spine on 6th segment re- 

 mains. Small statocyst sometimes present in 1st 

 antenna (Fig. 5b). Second antenna with spine on 

 blade, flagellum of 2 segments about half as long 

 as blade (Fig. 5c). First maxilla now without 



FISHERY BULLETIN: VOL. ,S7, NO. 3. 1989 



epipod, although a small protuberance some- 

 times remains (Fig. 5e). Epipod of 2nd maxilla 

 further enlarged, more setose (Fig. 5f). First 

 maxilliped stouter than previous, exopod much 

 reduced in size (Fig. 5g). Second and 3rd maxil- 

 lipeds changing little (Fig. 5h, i); chelae on 

 pereopods clearly defined (Fig. 5j). 



Mysis III (Fig. 6) with 2 dorsal rostral teeth. 

 Only 6th abdominal segment with dorsal spine. 



(k) 



Figure 5. — Atypopenaeus formosus mysis II. (a) whole animal (lateral view), (b) 1st antenna, (c) 2nd antenna, (d) 

 mandibles, (e) 1st maxilla, (f) 2nd maxilla, (g) 1st maxilliped, (h) 2nd maxilliped, (i) 3rd ma.xilliped, (j) 1st pereopod, (k) 



telson. Scale = 0. 1 mm. 



714 



