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RENAL ORGANS OF CERTAIN DECAPOD CRUSTACEA. 279 



The Renal Organs of Certain Decapod 

 Crustacea. 



By 



y/V. F. R. IVeldon, ]fI.A.» F.R.S., 



Jodrell Professor of Zoology and Comparative Anatomy in University College, 

 London ; Fellow of St. John's College, Cambridge. 



With Plates XXI & XXII. 



In a paper published during the summer of 1889,^ I gave an 

 account of the excretory apparatus of Palsemon serratus, 

 in which I drew attention to the enormous development of 

 the bladder, which extends dorsally from the level of the green 

 glands to the anterior boundary of the pericardium. 



The existence of a well-developed nephro-peritoueal sac, 

 having many of the relations of the '' coelomic " body-cavity 

 of other types, had not, at the time of publication of my 

 paper, been recognised in any Crustacean. I have since 

 observed the occurrence of a similar sac in a large number of 

 Decapoda; and M. P. Marchal,^ who has evidently worked 

 without any knowledge of my observations, has described 

 similar structures in a considerable number of genera. 



The object of the present communication is to give an 

 account of the renal organs of certain Carididae (Pandalus, 

 Virbius, and C rang on) in which the structure of the green 

 gland itself is modified in a very remarkable manner. 



Before proceeding to a description of the genera which it is 

 proposed more particularly to consider, it may be well to give 



' ' Journal of the Marine Biological Association,' N.S., vol. i, p. 162. 

 ^ ' Comptes Rendus,' cxi, 12, and cxi, 16. 

 VOL. XXXII, PART III. NEW SEE. T 



