THE PHYLOGEXY OF THE TliACHE.E IX AEAXEHE 561 
’78. “ Vei’sucli einer natiivliclien Aiiorilmmg dei- Spinnen iiebst 
Bemerkimgen zu einzelnen Gattnngen," ‘ Arch. f. Natiu’g.,’ xliv, 
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’98. Caiisard, M. — “ Recherches sur Fappareil circulatoii-e des Ara- 
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Pis. v-viii, 1902. 
:04. Lankester, E. Ray. — “ The Structure and Classification of the 
Arachnida," ‘ Quart. Journ. Micr. Sci.,' (2) xlviii, pp. 165-269. 
78 figs., 1904 (a reprint of the article “ Arachnida," ‘ Encyclo- 
piedia Britannica,' 10th ed., xxv, 1902). 
’92. Pocock, R. I. — “Liphistius and its bearing upon the Classifica- 
tion of Spiders." ‘Ann. Mag. N. H.,‘ (6) x, pp. 306-314, 2 figs., 
1892. 
’95. Pui-cell, W. F. — “ Note on the Development of the Lungs, Entapo- 
l^liyses, Tracheae, and Genital D^icts in Spiders,” ‘ Zool. Anz..’ 
xviii. pp>. .396-40(1, 2 figs.. 1895. 
:09. “ Development and Origin of the Respiratoiy Organs in 
Araneae," ‘Quart. .Tourn. Micr. Sci.,' (2), liv, pp. l-llO, Pis. 
1-7, and 7 text-figs.. 1909. 
’93. Simon. E. — ‘Histoire Naturelle des Araignees,’ 2nd ed.. i. pp. 257- 
488, Paris. 1893. 
’89. Tarnani, .1. K. — ‘"Die Genitalorgane der Thelyphonus,” ‘Biol. 
Centi-albl..' ix, no. 12. pp. 376-382, 5 figs.. 1889. 
KXl’LANATION OF VLA.TE 28, 
Illustrating’ Mr. W. F. Purcell’s paper on “The Pliylogeny 
of the Tracheae in A ranea'.” 
Abbreviations. 
fi. c. Anterior compai-tment of lateral pocket of trachea, a. tr. 
Anterior trachea, alxl. tv. Abdominal trunk of trachea, ant. Anterior 
side. hit. c. Blood corpuscles, hr. Branch of trachea, can. Canal of 
communication between the tracheal trunks, cejjh. tr. Cephalothoracic 
trunks of trachea, cii. Cuticula. d. hr. Dendritic tracheal branches. 
