346 



DISCOVERY REPORTS 



DEVELOPMENTAL PHASES 



It was possible to glean some information on the developmental phases of four of the species 

 encountered. This is presented below. 



Nyctiphanes capensis Hansen 



Egg. Size range 0-34-0-38 mm. in formalin. 



The eggs are carried in two pear-shaped sacs attached by their anterior broad sides to the endopodites 

 of the sixth and seventh cormopods, and by their narrow posterior ends to the exopodites of the 

 eighth cormopods (precisely as in N. simplex). 



Only one female with intact egg-sacs was found in the collection (Fig. 2). There were fourteen 

 eggs in one sac and sixteen in the other. The perivitelline space of the eggs is small (Fig. 3 a). 



Fig. 2. Nyctiphanes capensis. Ovigerous female. 



Nauplius. The nauplius stage (Fig. 36, c) is passed within the egg-sac. The specimens shown in 

 the figure were removed from the unruptured egg-sac of the female. 



The length of the two specimens examined was 0-42 mm. each. 



The larva is simple and egg-shaped. It has two small processes at the posterior end, each flanked 

 by one smaller process. 



The first antenna is uniramous with three terminal setae. The second antenna is biramous, the 

 rami with four and five terminal setae. The mandible is bud-like and naked. 



Pseudometanauplius. Only one specimen of this stage was found (Fig. 3 d, e). It was removed from 

 the ruptured egg-sac of a female. It is probable that the rest had already hatched out. 



Length of specimen 0-48 mm. The carapace is oval in dorsal view. The first antenna is unchanged. 

 The second antenna is the same as in the nauplius stage. A median eye has appeared. The anterior 

 lip and buds of three metanaupliar limbs have appeared. There is now a short tail with one pair of 

 postero-lateral and two pairs of terminal spines. The carapace, mandibles, anterior lip, limb-buds 

 and tail are covered by a thin skin. 



