1882.] Position of Ganglia, cjr., in Scorpions. 103 



Figures 2, 3, 4. Diagrams showing the disposition of the ganglia and chief nerves 

 in Scorpions. 



Figure 2 represents the arrangement found in Androctonus funestus. It is, except 

 for the position of the middle ganglion, the same as that described by 

 Newport, the median nerve given off from each ganglion of the cord, 

 and the two strands (instead of one) which constitute the cord being 

 additions to that author's results. 



Figure 3 represents the arrangement found in the large tropical Scorpio (Buthus T 

 or Heterometrus of Ehrenberg) cyaneus of Ceylon, and Sc. Kochii of 

 India, and also in the small European Scorpio Italicas, Eoes, and Scorpio 

 Carpathians, Linn. 



Figure 4 is Constructed from the figure given by Leon Dufour, of Androctonus 

 occifatms — the yellow Scorpion of Spain and Southern France. In 

 those points in which this figure differs from fig. 2, it seems probable 

 that Dufour is incorrect, but possibly he is not altogether so. 



oc, nerves to central and lateral eyes. 



1 — 6, nerves to the six limbs of the pro soma. 



7, nerve to the genital operculum (first segment of mesosoma). 



8, nerve to the pecten (second segment of mesosoma). 

 9 — 12, four hinder segments of the mesosoma. 



13, 14, two first segments of the metasoma. 

 P 1 to P 4 , the four pairs of pulmonary sacs. 



the adjacent parts of the segment in which it lies) is supplied from 

 the great ganglion of the prosoma. The ganglion lying in this, the 

 first rung-bearing segment, supplies the second lung-bearing segment. 



