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Transactions. 



[h.) The Phyllosoma (fig. 3). 



This stage has been known for some time, and need not be fully 

 described here, so only the chief points wherein it differs from the 

 naupliosoma will be mentioned. The antennae have become segmented, 

 but have lost their setae, although they are still biramose, and have spines at 

 the tips of each branch. The mouth parts are the same as in the preceding 



Fig. 3. — Phyllosoma larva of Jasus lalandii (M.-Edw.). X 23. 



stage, except that the spines now project freely beyond the ends. The 

 first three pairs of peraeopods are now completely unfolded, and the exopods 

 of the first two pairs bear long swimming-setae. The exopods of the 3rd 

 pair are rudimentary, as in the naupliosoma. The thorax and abdomen 

 are longer, and 6 segments can be seen indistinctly in the latter. There 

 is still a median eye. I have specimens of the phyllosoma sixteen days 

 old, but there is no sensible difference between them and the ones just 

 described. Mr. Anderton stated in his letter that he had not detected a 

 moult up to this stage. 



