378 PROF. E. R. LANKESTER ON CERTAIN POINTS IN THE 
prosomatic ganglion, and the first of the two mesosomatic ganglia lies in the third 
mesosomatic segment, whilst in the Androctonini (incl. Centrurini) both the regions of 
the first and of the second pairs of lung-books are innervated from the prosomatic 
ganglion, and the first mesosomatic ganglion lies in the fourth mesosomatic segment. 
The broad first segment of the metasoma has a ganglion in both cases. 
A B Cc D 
Diagrams of the arrangement of the chief nerves and ganglia in various Scorpions. 
A. Androctonus (Prionurus) funestus and several Androctonide. 
B, Buthus cyaneus and Euscorpionide and Telegonide. 
C. First specimen of Androctonus (Prionurus) occitanus. 
D. Second specimen of A. occitanus. 
1-6, the six segments of the prosoma. 7-12, the six segments of the mesosoma. 13, 14, the two first 
segments of the metasoma. P, to P,, the four pairs of lung-books. 
This generalization is based on the examination of the nerve-ganglia of two species of 
Telegonini (one from Coquimbo, the other from Tasmania) of Scorpio italicus, Scorpio 
cyaneus, and Brotheas subnitens on the one hand, and of those of Androctonus funestus, 
A. occitanus, A. americanus, and A. hottentotus on the other hand. 
An examination of the sculpturing of the chitinous surface of the lamelle of the 
lung-books in the same species has shown further that all the Scorpionini (incl. Telego- 
nini) have simple punctate ornament, whilst all the Androctonini (incl. Centrurini) have 
reticulate ornament in addition to punctiform. The latter is drawn in Pl. LXXXI. 
figs. 5 and 6, the former in Pl. LX XXI. fig. 7. 
