i892- 



NOTES ON ARACHNIDS. 527 



seven joints, only the first three in each are homologous. The palp of 

 a female spider or a harvestman, in which the horizontal and distal 

 parts are alike undivided, represents the primitive Arachnid limb. 



In walking, an Arachnid moves nearly together the first and 

 third legs on one side with the second and fourth on the other, 

 according to the observations of Gaubert. Several interesting con- 

 tributions to our knowledge of the locomotion of the Arthropoda have 

 recently been made, but a consideration of them must be reserved for 

 a future occasion. 



REFERENCES. 



1. Gaubert, P. — Recherches sur les Organes des Sens et sur les Systemes 



tegumentaire, glandulaire et musculaire des appendices des Arachnides. Ann. 

 Sci. Nat. Zool., vol. xiii., 1892, pp. 31-184, pis. i.-iv. 



2. Ja'WOFO'wski, A. — Ueber die Extremitaten bei den Embryonen der 



Arachniden und Insecten. Zool. Am., vol. xiv., 1891, pp. 164-9, 173-6. 



3. . Ueber die Extremitaten, deren Driisen, und Kopfsegmentierung bei 



Trochosa signoriensis. Zool. Anz., vol. xv., 1892, pp. 197-203. 



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Set., n.s., vol. XX., 1880, pp. 167-189, pis. xix.-xxi. 



5. Lankester, £2. Ray. — A new Hypothesis as to the Relation of the Lung-book 



of Scorpio to the Gill-book of Limulus. Quart. J. Micro. Sci., n.s., vol. xxv., 

 1885, pp. 339-42- 



6. Kingsley, J. S. — Notes on the Embryology of Limulus. Quart. J. Micro. Sci., 



n.s., vol. xxv., 1885, pp. 521-76, pis. xxxvii.-ix. 



7. MacLeod, J. — Recherches sur la Structure et la Signification de I'Appareil 



Respiratoire des Arachnides. Archiv. Biol., vol. v., 1884, pp. 1-34, pis. i.-ii. 



8. Laurie, M. — On the Development of the Lung-books in Scorpio fulvipes. Zool. 



Anz., vol. XV., 1892, pp. 102-5. 



9. Lebedinsky, J. — Die Entwicklung der Coxaldruse bei Phalangium. Zool. Anz., 



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Geo. H. Carpenter. 



