Williams. — Habits of Scutigerella. 
EXPLANATION OF PLATES. 
Abbreviations. 
at., antenna. 
hr., brain. 
cer., cercus. 
dig. ep., digestive epithelium. 
in., intestine* 
m. b. p’troph., peritrophic membrane. 
mid-gut, mid-gut. 
m’th, mouth. 
mu., muscle. 
oes., esophagus. 
parap., parapodia or rudimentary 
legs. 
pr. r., primary ridge of chorion. 
sac. vent., ventral sac or blood gill. 
scut, d., dorsal shield or scute. 
sec. r., secondary ridge of chorion. 
set. tac., sense organ. 
sp. gl., spinning gland. 
st., sternite. 
ts., testes. 
tu. mat., Malpighian tubule. 
va. d’f., vas deferens. 
vl., valve on mid-gut. 
PLATE 36. 
Fig. 1. Side view, young Scutigerella. X 100. 
Fig. 2. Dorsal view, young Scutigerella. X 100. 
Fig. 3. Ventral view, young Scutigerella. X 100. 
