i 



LIMTJLUS. 



i 





SCORPIO. 



1 



Tergites. 



Sternites. 



Appendages. 



Appendages. 



Sternites. 



1'ergifes. 



1 



Oephalo-thoraeic carapace 

 with central and peripheral 

 eyes. 



Camerostome (small tu- 

 bercular sclerite) in front 

 of the mouth. 



Small chela;. 



1 



Chelicerte. 



Camerostome (of La- 

 treille), or upper hp. 



Oephalo-thoracie carapace 

 with central and peri- 

 pheral eyes. 



i 



2 

 8 



The fused pro- and meso- 

 thoracie sternites (a 

 narrow elongate sclerite 



month to the rhilaria).' 



Chele. 



2 



Chehe. 



Obliterated by the mesiad 

 the four walkhig'legB; 



the two posterior fixed! 

 (In Mygale a distinctly 

 marked small prothoraeic 

 sternite is followed by a 

 large oval mesothoracic 

 sternite. 

 



2 



Chela. 



3 



Walking legs. 



3 



4 

 5 



Chela;. 



4 



Walking legs. 



4 



Chela. 



5 



Walking legs. 



5 



6 



The chilaria or paired me- 



Digging legs. 



6 



Walking legs. 



Pentagonal elongate scle- 

 rite or metathoracic 

 sternite. 



6 



7 



Narrow emargioate area 



I he abdominal carapace. 

 No dorsal pits. 



Abdominal carapace. 



i i- i icnlarf, 



Genital operculum. 



7 



Genital operculum. 



Soft integument. 



A separate narrow band- 

 like sclerite. 



7 



8 



B"irs1 poir of lateral spines. 

 E i rsl pair of dorsal pita 

 and entapophyses. 



Kputigniatio pair of scle- 

 rites ami si igmat ic pii s. 



1st gill-hook pair project- 

 ing. 



8 



Pectinse, or pair of comb- 

 like organs ; modified 

 gill-book projecting. 



Separate small rectangular 

 sclerite. 



A separate narrow band- 

 like sclerite. 



8 



9 



^tul |i:iir ill' lateral spines. 



2nd pair of dorsal pits 

 and entapophyses. 



ICpisI igmal ie pair of sclc- 



riles and Btigmatic pits. 



2nd gill-book pair project- 

 ing. 



9 



1st gill-book pair Bunk in 

 pulmonary sacs. 



A separate broad transverse 

 sclerite with stigmata 

 leading to pulmonary 

 sacs. 



A separate band-like scle- 

 rite. 



9 



10 



8rd pair of lateral Bpines. 

 mid entapophyses. 



rites and si igmatic pit h. 



3rd gill-book pair project- 

 ing. 



10 



2nd gill- 1 ook pair sunk in 

 pulmonn y sacs. 



A separate broad t ransverse 

 sclerite with stigmata 

 leading to pulmonary 



A separate band-like scle- 

 rite. 



10 



11 



M ii pair of lateral spines, 

 lib pair Hi' dorsal pits 



Kpist iginnl ie pair of sclc- 

 rites and sligmntic |iils. 



lib gill-book pair project- 

 ing. 



11 



3rd gill-book pair sunk in 

 pulmonary sacs. 



A separa te broad t ransverse 

 sclerite with Btigmata 

 leading to pulmonary 



A separate band-like sclo- 

 rito. 



11 





.ill pair of lateral pine 



Epistigmatio pair of scle- 

 rites and stigiuatie pits. 



5th gill-book pair project- 

 ing. 



12 



4th gill-book pair sunk in 

 pulmonary sacs. 



A separate broad 1 ransverse 



A separate baud-like Sole- 



12 





leading to pulmonary 



18 



6th pair of dorsal pits 



Large and solid sclerite 

 forming the sternum of 

 the "Telson," i.e., of the 

 pro-anal region of poten- 

 tial segmentation, which 

 includes a soft inviiginate 

 area on which opens the 

 ANUS. 



None. 



13 



None. 



A separate; broad t ransverse' 

 sclerite devoid of stig- 

 mata. 



A separate broad band-like 



13 

 14 











14 



In embryo, two Bogments 



el' which bhere is no 1 race 

 in the adult . The fore- 

 most of these is pro- 

 vided with a pair of 

 movable spines lite those 

 in front, but they dis- 

 appear during develop- 

 ment. 



None. 



14 



None. 



Ventral half of a distinct 



Dorsal half of n distinct 



15 



None. 



15 



None. 



Ventral half of a distinct 

 cylindrical sclerite. 



Dorsal half of a distinct 

 cylindrical sclerite 



15 



16 



None. 



l(i 



None. 



Ventral half of a distinct 





1G 







17 

 18 



None. 



17 None. 





Dorsal half of a distinct 



17 



cylindrical sclerite. 



cylindrical sclerite. 



None. 



IS 



None. 



Ventral half of a distinct 

 cylindrical sclerite, and 

 soft area in which is 

 placed the AHUS. 



Dorsal half of a distinct 

 cylindrical sclerite. 



18 





Vest -anal Spine. 















Post-anal Spine or Sting 







1 















(a jointed filament in 





















Thelyphonus). 





