DEVELOPMENTAL PHASES 373 



Second calyptopis. Five specimens examined (Fig. 230-c). Length range 1-6-2-0 mm.; average 

 length 1-7 mm. 



The carapace is unchanged except for its posterior margin which has a small, smooth projection in 

 the middle. 



The compound eyes and ocular luminous organ are defined, but the median eye is lost. 



Fig. 23. Nematoscelis megalops. a, second calyptopis, lateral view; b, telson; c, second calyptopis, dorsal view. 



The first antenna is biramous and has a three-segmented peduncle. The inner ramus carries three 

 terminal setae and the outer ramus four. The second segment of the peduncle carries a small spine on 

 its inner, distal margin. 



The remaining thoracic appendages are the same as in the first calyptopis except that the endopo- 

 dite of the first cormopod now has two segments. In none of the five specimens examined was there 

 any sign of the second thoracic limb. The thorax is clearly segmented. 



The abdomen has five segments and a telson. The developing uropods can be very clearly discerned 

 within the integument of the telson. The telson now carries seven terminal spines, three pairs of 

 postero-lateral and one pair of ventro-lateral. 



