72 
W. P. PUECELL. 
respiratory systems appears complete and their 
homologies almost self-evident. 
In the Palpimanidm, according to Lamy, the medial 
trunks are separate at least at their apex, while in the 
Scytodidae they are confluent to the apex and form a single 
median trunk. 
1 have examined preparations in caustic potash and sections 
Text-fig. 5. 
Filistatii caiiitata Hentz. Tracheal apparatus (after Lamy). ec. <. 0. 
entapophysis ; L fr., latei’al tracheal trunk. Magnified 100. 
from both families. The long, lateral trunks are connected 
by a canal of communication {can., fig. 38), lined internally 
with hooped spines {spi.), which also spread into the basal part 
of the median trunk. This latter is unpaired, and although 
in my examples of Palpimanus there are indications of a 
bifurcation at the apex, it is not nearly so prominent as in the 
species figured by Lamy (;02, p. 187, fig. 29). 
The median trunk is flattened dorso-ventrally and hollow 
