10 (I A) 



II (2A) 



12 (3 A) 



13 U A) 



14(5 A) 

 15 ^6 A) 



i6(7A) 

 17 (8A) 

 i8(9A) 



SCORPIONES 



MEDIAN EYES 



LATERAL EYES 



ROSTRUM 



CHELICERAE 



PEDIPALPI 



1 pair of LEGS 



2 pair of LEGS 



3 pair of LEGS 



4 pair of LEGS 



PEDIPALPI 



(First abdominal neuromere) 

 TERGITE = GENITAL OPERC. 



TERGITE = COMBS 



3 TERGITE = I LUNGS 



4 TERGITE = 2 LUNGS 



5 TERGITE = 3 LUNGS 



6 TERGITE = 4 LUNGS 



7 TERGITE = STERNITE 



CAUDAL SEGMENT 



2 CAUDAL SEGMENT 



3 CAUDAL SEGMENT 



4 CAUDAL SEGMENT 



5 CAUDAL SEGMENT 



MEDIAN EYES 



LATERAL EYES 



ROSTRUM 



CHELICERAE 



PEDIPALPI 



1 pair of LEGS 



2 pair of LEGS 



3 pair of LEGS 



4 pair of LEGS 



SOLIFUGAE 



TERGITE = STERNITE 



TERG. = GEN. OP., i LUNG 



3 TERGITE = STERN., 2 LUNG 



4 TERGITE = STERNITE 



5 TERGITE = STERNITE 



6 TERGITE = STERNITE 



7 TERGITE = STERNITE 



8 TERGITE = STERNITE 



9 TERGITE = STERNITE 



CAUDAL SEGMENT 



CAUDAL SEGMENT 



3 CAUDAL SEGMENT 



MEDIAN EYES 



LATERAL EYES 



ROSTRUM 



CHELICERAE 



PEDIPALPI 

 1 pair of LEGS 



OPILIONES 



2 TERG. = 2 p. LEGS = i stig. 



3 TERG. = 3 p. of LEGS 



4 TERG. = 4 p. of LEGS 



Segment = GENITAL OPERC. 



? 



ROSTRUM 

 CHELICERAE 

 PEDIPALPI 



1 pair of LEGS 



2 pair of LEGS 



3 pair of LEGS 



4 pair of LEGS 



GEN. Arches = GENIT. OPERC. 



STIGMA 

 SEGMENT 



SEGMENT 



3 SEGMENT 



4 SEGMENT 



5 SEGMENT 



6 SEGMENT 



7 SEGMENT 



OPERCULUM ANALE 



ARANEAE 



DIRECT EYES 



INDIRECT EYES 



ROSTRUM 



CHELICERAE 



PEDIPALPI 



1 pair of LEGS 



2 pair of LEGS 



3 pair of LEGS 



4 pair of LEGS 



PETIOLUS 

 GENITAL OPENING = i LUNGS 



; LUNGS or SPIRACLE 



CRIBELLUM and ANT. SPINNER, 



MED. and POST. SPINNERETS 



ANAL TUBERCLE 



LIMULUS 



MEDIAN EYES 



LATERAL EYES 



? ROSTRUM 



CHELICERAE 



PEDIPALPI 



1 pair of LEGS 



2 pair of LEGS 



3 pair of LEGS 



4 pair of LEGS 

 CHILARIA 



GENITAL OPERCULA 



1 GILL-BOOKS 



2 GILL BOOKS 



3 GILL-BOOKS 



4 GILL BOOKS 



5 GILL-BOOKS 

 6 ABDOMINAL SPINE 



2 postbranchial neurom. 



3 postbranchial neurom. 



