10 
\V. F. PUKCEU,. 
tion, forming a stalk or pedicel {iie.d.) to the whole lung- 
complex. This opens into — 
(3) An elongated-lanceolate hollow hand^ the pulmonary 
sac (ante-chamber or vestibule, a.), 'which runs 
from just in front of the medial angle of the spiracle at fii’st 
in a dorso-lateial direction, but becomes procurved at a 
greater or less distance beyond the lateral angle of the 
spiracle to form the horn (Schneider, li.) and terminates in a 
short, blind, apical pouch [aj).). 
(4) A series of long, flattened, hollow pouches (saccules, 
6'.), which are triangular in shape, like a flattened butterfly- 
net, generally horizontal, and placed one over the other in a 
Text-fig. 1. 
Attns floricola. Ventral surface of abdomen. Ih. Pulmonary 
operculum, iniltn. xp. Pulmonary spiracle, tr. xp. Tracheal 
spiracle. Magnified 13. 
slightly imbricating manner (each being slightly more lateral 
than the one below it), like the leaves of an open book. The 
saccules, being invaginations of the anterior wall of the ante- 
chamber, communicate with its lumen by their open posterior 
ends, which form a series of parallel slits, like an oven-grate 
(Bertkau), extending obliquely across the entire anterior 
surface of the ante-chamber, including the corresponding 
ventral surface of the procurved horn, being absent only from 
the small apical pouch of the latter.^ 
' In some text-books, e. g. Korschelt and Heider ('92. p. 605, fig. 382) 
