13-18 
24. NEW YORK STATE MUSEUM 
or m d ch 
wil _wile wii: / P On Aa Tas 
Mb Beary i, “va Wve _ N tap; ZY 
o - one Poca \\ . AY t y Ye a A. ee ome wen “hens i - Sa a MG 
eee 27 iY “ e S; SS a Q [S; , Ps’ ESS, 70 
OY ee" A PMA £, CL yr 5 PRM al. 
Zann ca ALPEN SR ej 
ia é er yd ae ae 
3 wS . i \ i S 
wan we ee ee eS ew ee @ ww ww we ee ee ee 
Figure 2 Diagram of an Eurypterid 
a; Ia~- VIa = appendages or legs 
Ab=abdomen 
bl = balancing leg 
ca == carapace or head shield 
car ==carina of telson 
Ce ==cephalothorax or prosoma 
ch =chelicerae, Ia, preoral appendages or mandibles 
Cj == coxa 
end = postoral appendages or endognathites 
ep = epimera or pleura of tergite 
ga == genal angle 
gea = genital appendage (female ) 
gl = glabella 
gn = gnathobase 
le lateral or compound eyes 
md == marginal doublure 
me == metastoma or postoral plate 
mo == mouth 
mp ==marginal plate on under side of cephalothorax 
o= “larval ’’ median eyes or ocelli 
om = ocellar mound 
on = ocular node 
op = operculum or first sternite 
pa = palette 
Po==postabdomen or metasoma 
pp = pentagonal pieces 
Pr = preabdomen or mesosoma 
ps, I- VI= caudal or postabdominal segments 
r=rim ' 
rh == rhachis 
s, IJ- V =sternites 
sf = swimming leg 
t= telson 
t, I-VI = tergites 
ta == tubular organs 
t}= triangular lobes 
va = visual area 
wl 1-3 = walking legs 
