52 
\V. F. PUECKLL. 
ever, here directly coutinuous with the spiracles. The male 
(but not the female) of Harpactes is also remarkable in that 
the opening of the genital organs lies immediately in front of, 
but separate from, the interpulmonary fold (p. o., fig. 40), 
whereas in all other Dipneumonous spiders examined the 
genital opening lies in the anterior wall of the fold. 
In the Tetrapneumonous spider ^ examined I found no inter- 
Text-fig. 2. 
Crypsidromus intermedins. Ventral surface of abdomen. 
//>.. opercula of lung-books ; .sp.. spiracles of lung-books ; 
ec. t. 8 and 9., muscle insertions; fj. o., genital opening. 
Magnified fi. 
pulmonary fold connecting the .spiracles, but on the medial 
side of the latter (but separate from them and from the 
genital cleft) shallow depressions resembling stigmata in the 
cuticula were observed (er.i. 8 and 9, text-fig. 2), which proved 
in sections to be the places to which the entochondrites of the 
ventral longitudinal muscles are attached. These rudimentary 
‘ Specimens labelled “Crypsidromus intermedins, Paraguay,” 
obtained from the Berlin Zoological Lal>oratory. 
