318 PROCEEDINGS OF THE ACADEMY OF [May, 



Lankester, E. R. 1881. Limulus an Arachnid. Quart. Journ. Micr. Sci. 



(2), 21. 

 Laurie, M. 1894. On the Morphology of the Pedipalpi. Journ. Linn. Soc, 



London, 25. 

 Leuckart, E. 1849. Ueber den Bau und die Bedeutung der sog. Lungen 



bei den Arachniden. Zeit. wiss. Zool., 1. 

 Leydig, F. 1855. Zum feineren Bau der Arthropoden. Muller's Arch. 

 Locy, W. A. 1886. Observations on the Development of Agelena nsevia. Bull. 



Mus. Zool. Harvard, 12. 



MacLeod, J. 1S84. Recherches sur la structure et la signification de l'appareil 



respiratoire des Arachnides. Arch, de Biol., 5. 

 Menge, A. 1843. Ueber die Lebensweise der Arachniden. Neueste Schr. 



Naturf. Ges. Danzig, 4 

 Milne-Edwards, A. 1873. Recherches sur l'Anatomie des Limules. Ann. 



Sci. Nat. (5), 17. 

 Montgomery, T. H., Jr. 1906. The Analysis of Racial Descent in Animals. 



New York. 

 Morin, J. 1887. Zur Entwicklungsgeschichte der Spinnen. Biol. Centralbl., 6. 



Patten. W. 1S90. On the Origin of Vertebrates from Arachnids. Quart. 



Journ. Micr. Sci. (2), 31. 

 Purcell, F. 1895. Note on the Development of the Lungs, Entapophyses, 



Trachea^ and Genital Ducts in Spiders. Zool. Anz., 18. 



Salensky, W. 1871. (Development of Araneads. Russian.) Sapiski Ges. 



Naturf. Kiew. 32. 

 Schimkewitsch, W. 1884. Zur Entwicklungsgeschichte der Araneen. Zool. 



Anz., 7. 

 Idem. 1887. Etude sur le developpement des Araignees. Arch, de Biol.. 56. 

 Schneider, A. 1892. Melanges arachnologiques. Tablettes Zoologiques, 



Poitiers, 2. 

 Simmons, O. L. 1894. Development of the Lungs of Spiders. Amer. Journ. 



Sci. (2), 48. Tufts College Studies, 2. 

 Simon, E. 1892. Histoire Naturelle des Araignees. 2 me ed. 1. Paris. 

 Idem. 1908. Etude sur les arachnides du Tonkin. Bull. sc. France et Bol- 



gique, 43. 

 Simroth, H. 1891. Die Entstehung der Landtiere, Leipzig. 

 Sinclair, F. G. 1892. A new Mode of Respiration in the Myriapoda. Ann. 



Mag. Nat. Hist. (6), 9. 

 Stevenson, C. W. 1908. On the Spinning Organs and Architecture of Evagrus, 



a Theraphosid Aranead. Biol. Bull, 15. 

 Straus-Dtjrckheim. 1829. Appendix to Vol. 6 of French translation of Meckel's 



Comparative Anatomy (fide Lankester). 



Thorell, T. 1870. Remarks on S}Tionyms of European Spiders. Upsala. 



Wagner, J. 1895. Beitriige zur Phylogenie der Arachniden. Jena. Zeit., 29 

 Wallstabe, P. 1908. Beitriige zur Kenntnis der Entwicklungsgeschichte der 



Araneinen. Zool. Jahrb., 26. 

 Weissenborn, B. 1886. Beitriige zur Phylogenie der Arachniden. Ibid. 



Explanation of Plates XI, XII, XIII, XIV. 



All the figures have been made by the author with the aid of the camera 

 lucida, and in each the anterior region is directed upwards, In the lettering of 

 the plates the following abbreviations have been employed: 



1-11, abdominal segments 1 to 11. A. Sp., anterior spinneret. 



1 G.-ll G., ganglia of the preceding. Bl. Cai\, blood cavity. 



2 Ap.-5 Ap., appendages of abdomi- Chel., cheliceron. 

 nal segments 2-5. C. L. } caudal lobe. 



An., anus. Ccel., coeloni. 



