5 A 
ON THE MUSCULAR AND ENDOSKELETAL SYSTEMS OF SCORPIO. 
DESCRIPTION OF PLATES LXXVII. tro LXXIX. 
PLATE LXXVII. 
. Prosoma and metasoma of Scorpio (Buthus). 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 (PJ), the 
pericardium, and the lung-sacs (/s). 
. Dorsal aspect of the mesosoma and metasoma of Scorpio (Buthus). The tergites 
have been removed in order to show the dorsal longitudinal muscles. 
. Ventral aspect of the mesosoma and metasoma of Scorpio (Buthus). The 
sternites have been removed to show the ventral longitudinal muscles; on 
the left the arthrodio-sternal muscles (31-34) have been removed. 
. Diagrammatic view of a lateral dissection of the prosoma and mesosoma of 
Scorpio (Buthus). 
. Ditto of the prosoma and mesosoma of Scorpio (Androctonus). 
PLATE LXXVIILI. 
. 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. 
. Under-surface of the carapace, showing the attachments of the muscles. 
. Mesosoma of Scorpio (Buthus). Dorsal aspect. The tergites and viscera have 
been removed in order to show the muscles, lung-sacs, and nerves. 
. Mesosoma of Scorpio (Androctonus). Dorsal aspect. Tergites and viscera 
removed. 
PLATE LXXIX. 
. Transverse section of a pericardio-ventral muscle from the mesosoma of Scorpio 
(Buthus), showing vascular space (vs) cut across. 
. Transverse section across the prosoma of Scorpio (Italicus), showing the 
muscles attached to the pharynx. 
. Transverse section of the same pharynx anterior to fig. 11. 
. Carapace of Scorpio (Buthus). Ventral aspect. 
. Transverse section of the segment bearing the pectines, showing the supra- 
pectinal chondrite (spc) with muscles attached. 
. 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). 
View of the inner sternal surface of the prosoma of Scorpio (Buthus). All 
the viscera removed, only the hard skeletal parts left. 
