20 



DISCOVERY REPORTS 



Table V. Occurrence of Second Nauplius 



The outline of the body in dorsal aspect is roughly oval (Fig. zb), truncated at the 

 posterior end and tending to be pointed, rather than rounded, at the anterior end. At 

 each postero-lateral corner of the body there are two spines, a longer inner one about 

 one-quarter to one-third of the length of the body, and a shorter outer one about one- 

 tenth of the length of the first-mentioned spine. Three pairs of appendages are de- 

 veloped (Fig. za). The antennules are uniramous with two terminal setae; the antennae 



Fig. 2. Second Nauplius ( x 46). a, lateral aspect; b, dorsal aspect. 



are biramous, having six terminal setae on the inner ramus and three terminal and one 

 lateral on the outer. Posterior to the antennae are the biramous mandibles, each ramus 

 having three setae distally. 



METANAUPLIUS 



In appearance the Metanauplius is very robust and of great size in comparison with 



other euphausian Metanauplii found in the same region. The average lengths of the 



larvae from different stations are given in Table VI. A hundred Metanauplii from St. 



647, 750-500 and 1000-750 m. respectively, were measured and give normal length 



