22 



DISCOVERY REPORTS 



The carapace (Figs. 3 a, b) which envelops the anterior portion of the body and 

 part of the abdomen is without marginal spines or processes. It is tucked in under the 

 body posterolaterally, so that when it is dissected and flattened out (Fig. 3 d) the pos- 

 terior portion is wider than the anterior. At the anterior margin of the body underneath 

 the carapace a small pair of frontal sense organs can be distinguished. There are traces 



Fig. 3. Metanauplius. 



a, dorsal aspect ( x 46) ; d, extended carapace ( x 46) ; 



b, lateral aspect ( x 46) ; e, telson ( x 100) ; 



c, ventral aspect ( X 46); /, antenna ( x 100). 



In Figs. 3 b and c the bristles on the appendages have been omitted. 



of the paired eyes of the adult and of the median eye, although the latter is not easily 

 seen. The compound eyes are in the form of two roughly spherical masses, and each 

 contains a bunch of fibres within its tissues which is the developing luminous organ of 

 the ocular peduncle (cf. Metschnikoft', 1869, pp. 479, 481, fig. xxxvi). The abdomen is 



