346 



THE VOYAGE OF H.M.S. CHALLENGER. 



Pleurobranchiae, 

 Arthrobranchiae, 

 Podobrancbiae, 

 Mastigobrancluu.', 



Pleurobranchiae, 

 Arthrc/branchiae, 



Podobrancbiae, 

 Mastigobranchi;e , 



Sergestes japonicus. 

 /I fl /l /l 



Pleurobranchiae, 

 Artbrobranchiae, 

 Podobranchia?, 

 Mastigobranch iae, 



Sergestes hroyeri. 



n n 



i 

 i 



h i 



k 



/I 



Pleurobranchiae, 

 Arthrobranchise, 

 Podobranchiae, 

 Mastigobranchiae, 



Sergestes prehensilis. 



l 1 



l 



1 



b i k 



lr 



I think it is desirable that the Preliminary Remarks on the Development of some 

 Pelagic Decapods, by Dr. v. Willemoes-Suhm, communicated to the Royal Society, and 

 published in their proceedings, 1 should in justice to him be reproduced here, so that they 

 may have their full weight on the minds of those who may see the drawings of the animals, 

 in which he took great interest. 



" Since we left Australia I have investigated the metamorphoses of some Crustacea 

 which have been constantly caught by us on the surface of the tropical and subtropical 

 parts of the Pacific. Though these investigations will be continued, I have now arrived 

 at certain results which I think will not be uninteresting to zoologists. The genera to 

 which these remarks refer are Amphion, Sergestes, and Leucifer. 



" Amphion Reynaudi has been on our lists as an animal ' inceriw sedis' (Milne - 

 Edwards) for nearly forty years, until Dorhn proved that a full-grown specimen of it, 

 which he dissected, was in possession of branchiae and of an ovary, therefore, no doubt, a 



1 Proc. Roy. Soc, vol. xxiv. p. 132, 1876. 



