POINTS OF THE ANATOMY OF POLYXENUS LAGURUS. 97 
On Some Points of the Anatomy of Polyxenus 
lagurus. 
By 
F. G. Heathcote, M.A., 
Fellow of the Cambridge Philosophical Society. 
With Plate VIL. 
Tue following does not profess to be a complete account of 
the anatomy of this interesting little Myriapod. In working 
out the development of Julus terrestris, certain questions 
occurred which led me to investigate the adult anatomy of 
some other forms, amongst them of Polyxenus, and I con- 
sidered that the following notes might be of interest to other 
observers. I found it very difficult to obtain material, and 
had it not been for the kindness of Dr. St. Remy, who was 
also working at Myriapods, and who took great trouble to 
procure a supply of Polyxenus for me, I must have delayed 
the publication of these notes for a considerable time. This 
form has been investigated by several naturalists, especially by 
Fabre and Bode (2, 1).!' I-have also availed myself of the 
excellent work of Latzel (4). 
External Features. 
In comparing the body of Polyxenus with that of Julus, the 
most striking peculiarity in Polyxenus is the composition of 
the individual segments. Each body-ring, as described by 
Bode, consists of a dorsal plate, two lateral plates, and two 
1 The figures refer to the list of literature at the end of the paper, 
