BOOKS ABOUT SPIDERS. 



Ci-ASSiFic,\TiON. — Thordl's "Genera of European 

 Si»ders,'' in - Acta R^a Societatis Scientiarum Upsa- 

 lensis," 1S69, and Thorell's " SynonjTnes of £un>pean 

 Spideis,'" contain a complete history of the classification 

 of the spiders of Xorthem Europe, with references to all 

 4e descriptions of genera and species, and remarks on 

 4e use of names and groups by diflterent authors. The 

 great resemblance between the European and Xorth- 

 American spider faun» make these the most useful 

 books for American students- Simon's - Arachnides de 

 France." a work not yet completed, describes all the 

 spiders in France, and refers to descriptions of the 

 other European species. It cont^ns tables by which 

 the ^nus and species to xrhich any spider belongs can 

 be found by the use of a few prtHninent characters. 



Anatomy. — Sidiold's " Anatomy of the Invertebrata ' 

 contains a good general accoimt Bertkau describes, in 

 -*Traschel's Archivfur Naturgeschichte," Ae mandibles 

 in iSra the respiratory^jrgans in 1S72, and the sexual- 

 organs in i $75. OefBnger desoibes the spinning-gfauids 

 in " Arvhiv fiir Microscopisdie Anatomic," i86a 



Embryology. — OaparMe, Utrecht, 1862, and Bat 

 Uani, in -.\nnales des Sciences Katurefles," 1872, de- 

 scribe the growdi of die ^g from s^mentation to 



