No. 6.] THE EXCRETORY ORGANS OF LIMULUS. 313 



The kidney of Limulus is, therefore, derived from segmentally 

 arranged groups of excretory cells. Each group of cells prob- 

 ably emptied originally into its corresponding coelomic cavity, 

 and from there to the exterior. The separate external open- 

 ings have now disappeared, and the organs are united by longi- 

 tudinal tubules which finally open by a single duct, or coelomic 

 funnel, to the exterior. 



Many of the details of the above account were worked out 

 in the biological laboratory at Dartmouth College by Miss 

 Annah P. Hazen. They will be fully described and illustrated 

 in a joint paper that we hope will appear at an early date in 

 the Journal of Morphology. 



HANOVER, N. H., 



January 17, 1898. 



