DEVELOPMENTAL PHASES 349 



The carapace is a little longer than half the total length, and is smooth along the inferior margin 

 (cf. N. austral is, smooth; A 7 , simplex, smooth; and N. couchii, denticles). 



The median eye is lost and the compound eyes are now well defined but not pigmented. The ocular 



luminous organ is visible. 



There are three segments to the peduncle of the first antenna, which is biramous, the outer ramus 



carrying four terminal spines and the inner, three. 



0'5mm 



0-25 mm 



Fig. 5. Nyctiphanes capensis. a, second calyptopis, lateral view; b, telson of same; 

 c, second calyptopis, dorsal view. 



The remaining thoracic appendages are larger than in the preceding stage but are otherwise un- 

 changed. Occasionally the rudiments of the second thoracic limb may be discerned as a small naked 

 process. The segmentation of the thorax is clearly visible. 



The abdomen now has five segments and a telson. The developing uropods can be seen within the 

 integument of the telson. The telson retains the three pairs of postero-lateral and one pair of ventro- 

 lateral spines of the previous stage, but now has seven terminal, serrated spines. 



