AMBRICAN SPIDERS AND THEIR SPINNINGWORK. 
Fia. 321. 
PIE DES, V 
Sayre Sars 
eS — 
FxG, 326. Fa; 827. 
A CoMPARATIVE VIEW OF THE NESTING ARMOR OF RuIzopops, CADDIS Fiies, AND BAG Worms. 
Fic. 820. Case of Caddis(Limnophilus flavicornis), made of minute shells. 
made by the larva (FG. 822) of a Caddis fly. 
bicus), made of moss. 
leaves. 
Tic. 321. Case of gravel, 
Fic. 323. Case of Caddis worm (Limnophilus rhom- 
Via. 324. Case of Caddis (Limnophilus pellucidus), made of pieces of 
Fic. 325. The basket or thatched bag of the Bag worm (Theridopterix). Fic. 326, Shell 
of a Rhizopod, Difflugia urceolata (variety amphora), built up of quartz sand. 100 diameters. 
(After Leidy.) Fic. 327. Shell of Rhizopod, Difflugia acuminata, composed of quartz sand and 
diatoms. 200 diameters. (After Leidy.) 
6 ee 
