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species. The size of the lobes varies with the size of the larvae, being inconspicuous in 

 the very small larvae and large and easily noticeable in the larger specimens. The com- 

 pound eyes are more distinctly defined but do not project beyond the margin of the 

 carapace. The fibres of the developing luminous organ at the base of the eyes can be dis- 

 tinguished in the posterior region of the ocular mass. 



The antennule consists of a three-jointed peduncle with two rudimentary flagella 

 distally, the one rather larger than the other (Fig. 5 d). The sensory filaments on the 

 outer flagellum are situated terminally; there are none on the inner flagellum. The 

 antennae and mandibles are as in the previous stage. The first maxilla (Fig. 5 e) is also 

 similar to that found in the ist Calyptopis except that the outer masticatory lobe bears 

 five spines instead of three and the palp is indistinctly two-segmented. The 2nd maxilla 

 and the ist thoracic appendage are, in form, as in the previous stage. 



