2 54 KINGSLEY. [Vol. VIII. 



while the biramous appendage and the epipodial gills would 

 rather indicate relationships between the Phyllopods and the 

 lower Podophthalmia. It will prove a profitable field for some 

 student of Arthropod morphology to repeat Walcott's earlier 

 investigations. It will be noticed that I place the grounds for 

 rejection of the association of Limulus and the Trilobites upon 

 different grounds from those advanced by Owen ('72, pp. 491- 

 493) and the older Milne Edwards ('8l). 



Tufts College, Mass., 

 Mar. 12, 1893. 



