396 



ZOOLOGY 



Appendages of Scorpio. 



1. Chelicerae. 7. Plates with genital pores. 



2. Pedipalpi. 8. Pectines. 



3. 'Walking-legs. 9. Lung-books. 



4. „ 10. 



5. ,, n. 



6. „ 12. 



The first pair of appendages, or chelicerae, are short, three- 

 jointed, and chelate. They are directed forward. The second 

 pair, or pedipalpi, are very much enlarged, and six-jointed; 

 they end in a swollen powerful pair of nippers; the coxae or 

 basal joints of this pair of limbs have a biting process which 

 guards the entrance to the alimentary canal. The remaining 

 prosomatic limbs are walking-legs ; they are seven-jointed, and 



Fia. 225. — Ventral view of pro- and 

 meso-soma of Buthus afer. From 

 Leuokart, after Ciivier. 



not chelate. The first and second of these ambulatory ap- 

 pendages have their coxal joint enlarged and turned forward, 

 and the processes thus formed play some part in the ingestion 

 of food. The coxae of the last two pairs of walking-legs are 

 fused together, but those of the left side are separated from 

 those of the right by a small sternum. 



The seventh pair of appendages, or first mesosomatio pair, 



