OF SEGMENTATION IN THE ARTHROPODA. 
CRUSTACEA. 
MALACOSTRACA 
(Astacus). 
| 
Stalked eyes 
Antennules 
Antenne 
Mandibles 
Maxillulie 
Maxille 
1st maxillipeds 
2nd es 
3rd mi 
Chele 
1st walking legs 
2nd 2 i) 
4th ve 3 
1st pleopods 
2nd a 
3rd = 
4th ,, 
5th * 
[Segment 
represented in 
Gnathophausia ]. 
See Sars (26) 
Uropods 
rs segment 
Telson 
| 
| 
473 
INSECTA. 
Kyes 
Feelers 
Tritocerebral 
rudiments. 
Wheeler (30), 
Uzel (29) 
Mandibles 
Maxillule. 
Hansen (6), 
Folsom (4) 
Ist maxille 
nde s 
(labium) 
Ist legs 
ondaae 
1st abdominal 
segment 
2nd = 
3rd As 
4th 8 
5th Fp 
6th a: 
7th f 
? 
8th 3 
9th » 6 
10th. ,, 
Cercopods. 
Heymons (9) 
Anal segment 
Median cercopod 
in Thysanura 
and Ephemerida 
positions of the genital openings. 
DIPLOPODA CHILOPODA . 
oe (Polyxenus). (Lithobius). Sete 
— Eyes Eyes. I 
| Pre-antennal 
rudiment in 
Scolopendra. 
Heymons (11)] 
Feelers Feelers Feelers 2 
=: — Tritocerebral 3 
rudiments. 
Heymons (11) 
Mandibles Mandibles Mandibles 4 
Maxillule. Maxillule 1st maxille 5 
Hansen (7), [Figs. 1—5, mal, of 
Carpenter (3) present paper) 
1st maxille 1st maxille 2nd ~,, 6 
rael | ae PAIL Fee Poison-feet Of 
(labium). (labium ) 
Hansen (7) (Figs. 1—4, la, of 
present paper) 
Ist legs Ist legs Ist legs 8 
Indi 7}: Pade 2nd , 9 
srg @ sed) yl ge) Saeds lh 10 
4th ,, 4th ,, Athan, il! 
Sth, bth ,, Sth oe 12 
6th ,, 6th ,, 6th ,, 13 
Tisae 36 (ida, (Adsl ty 14 
8th ,, 8th ,, Sth 4 115} 
9th ,, Och. =: 9th ,, 16 
Othe a Oth... Oth: 5; 1y/ 
lebhee 5: ithe o.5 1ihdee eee 18 
12th ,, re 3 12th |, 19 
Reduced limbs 13th ,, Ith .;, 20 
Cercopods Limbless seg- 14th ,, 21 
ment 
Anal segment | Anal segment 15th ,, 22 
Genital limbs, 23 
as 
Anal segment 24 
