416 PROCEEDINGS OF THE ACADEMY OF [May, 



ment des membres et des poils tactiles des Arachnides, p. 15 of the second 



part (ibidem). 



1892. Recherches sur les organes des sens et sur-les systems tegumentaire, 



glandulaire et musculaire des appendices des Arachnides (Ann. Sci. Nat. Zool., 



(7), XIII, pp. 31-185, Pis. I-IV). 

 Hansen, H. J. 1893. Organs and Characters in Different Orders of Arachnids 



(Entomologiske Meddelelser, pp. 136-251, Tab. II-V). 

 Hansen, H. J., and Sorensen, W. 1904. On Two Orders of Arachnida (Cambr. 



Univ. Press, pp. 42 and 130). 

 McCook, H. C. 1890. American Spiders and their Spinning Work' (Vol. II, 



Philadelphia). 

 McIndoo, N. E. 1911. Notes on Some Arachnids from Ohio Valley Caves 



(Biol. Bull., Vol. XX, No. 3, February). 

 Montgomery, T. H., Jr. 1909. Further Studies on the Activities of Araneads, 



II (Proc. Acad. Nat. Sci. of Philadelphia, pp. 557, 558). 

 Packard, A. S. 1887. Abstract of Kraepelin's Criticisms on Works of Writers 



on Olfactory Organs of Arthropods. (Am. Nat., XXI, p. 182). 

 Peal, S. E. 1895. Stridulating Organ in a Spider (Nature, LII, p. 148). 

 Peckham, G. W. and E. G. 1887. Some Observations on the Mental Powers 



of Spiders (Journ. Morph., I, pp. 383-419). 

 Pocock, R. I. 1895. On a New Sound-producing Organ in a Spider (Ann. 



Mag. N. Hist., (6), XVI, pp. 230-233). 

 Pritchett, Annie H. 1904. Observations on Hearing and Smell in Spiders 



(Am. Nat., XXXVIII, pp. 859-867). 

 Schimkewitsch, W. 1885. Sur un organ des sens des Araignees (Zool. 



Am., IV). 



1884. Recherches sur l'anatomie de l'Epeira (Ann. Sci. Nat., p. 7). 



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

 Spencer, Baldw. 1895. The Presence of a Stridulating Organ in a Spider 



(Nature, LI, p. 438). 

 Wagner, M. W. 1888. La Mue des Araia;nees (Ann. Sci. Nat., Paris, (7), 



p. 295). 

 1888. Des Poils nommes auditifs chez les Araignees (Bull, de la Soc. 



imp. des naturalists des Moscou, p. 121). 

 Westring. 1843. Stridulation of Asagena phalerata (Nat. Hist. Tidsskr., 



IV, Copenhagen, p. 349). 

 Wood-Mason. 1875. Stridulation of a Theraphosid (Proc. Asiat. Soc. Bengal, 



p. 197). 

 Vogt, O, et Yung, E. 1894. Anatomie Comparee (Vol. II, Paris, p. 209). 



Explanation of Plates XXX-XXXII1. 



All figures are from camera lucida drawings made at the base of the micro- 

 scope. 



Abbreviations. 



ag. cyt aggregations of dense staining di dilatation. 



cytoplasm. ex. m extensor muscle. 



art artery. fl flask of socket. 



b border. hyp hypodermis. 



b. c blood corpuscles. int. b internal border. 



b. m basement membrane of hypo- 1. o lyriform organ. 



dermis. m. b muscle bundle. 



b. m. n... .nuclei of basement membrane, m. nuc muscle nuclei. 



b. p blood plasm. mov. h movable tactile hair. 



ca cavity of hair. N nerve of leg. 



con. t connective tissue. N. b nerve branch. 



con. t. n. .connective tissue nuclei. n. f nerve fiber. 



•cu cuticula. neu neurilemma. 



\t. s cytoplasmic substance. el neu nuclei of neurilemma. 



