360 ON THE MUSCULAE AND BNDOSKELETAL SYSTEMS OF SCORPIO. 



DESCEIPTION OF PLATES LXXVII. to LXXIX. 



PLATE LXXVII. 



Fig. 1. Prosoma and metasoma of Scorpio {Butlms). Dorsal aspect. The tergum of 

 the left side has been cut away and the viscera removed in order to expose 

 the dorso-ventral muscles. The superficial muscles of the prosoma have also 

 been removed. Besides the muscles there are seen the plastron [PI), the 

 pericardium, and the lung-sacs {Is). 



Fig. 2. Dorsal aspect of the mesosoma and metasoma of Scorpio (Buthus). The tergites 

 have been removed in order to show the dorsal longitudinal muscles. 



Fig. 3. Ventral aspect of the mesosoma and metasoma of Scorpio (Butlms). The 

 sternites have been removed to show the ventral longitudinal muscles ; on 

 the left the arthrodio-sternal muscles (31-34) have been removed. 



Fig. 4. Diagrammatic view of a lateral dissection of the prosoma and mesosoma of 

 Scorpio (Buthus). 



Fig. 5. Ditto of the prosoma and mesosoma of Scorpio (AndroctOnus). 



PLATE LXXVIII. 



Fig. 6. Dorsal aspect of the prosoma of Scorpio (Buthus). The carapace has been 

 removed in order to expose the muscles. On the left side the more super- 

 ficial muscles are removed. 



Fig. 7. Under-surface of the carapace, showing the attachments of the muscles. 



Fig. 8. Mesosoma of Scorpio (Buthus). Dorsal aspect. The tergites and viscera have 

 been removed in order to show the muscles, lung-sacs, and nerves. 



Fig. 9. Mesosoma of Scorpio (Androctonus). Dorsal aspect. Tergites and viscera 

 removed. 



PLATE LXXIX. 



Fig. 10. Transverse section of a pericardio-ventral muscle from the mesosoma of Scorpio ^ 



(Buthus), showing vascular space (vs) cut across. i 



Fig. 11. Transverse section across the prosoma of Scorpio (Italicus), showing the ■•* 



muscles attached to the pharynx. v 



Fig. 12. Transverse section of the same pharynx anterior to fig. 11. 

 Fig. 13. Carapace of Scorpio (Buthus). Ventral aspect. 

 Fig. 14. Transverse section of the segment bearing the pectines, showing the supra- 



pectinal chondrite (sp>c) with muscles attached. 

 Fig. 15. View of a longitudinally divided prosoma of Scorpio (Buthus). All the viscera 



removed, and only the hard skeletal parts left (compare with woodcut, 



fig. 1). 

 Fig. 16. View of the inner sternal surface of the prosoma of Scorpio (Buthus). All 



the viscera removed, only the hard skeletal parts left. 



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