Spermatogeuesis in spiders. 511 



Wallace, in 1900, published a preliminary note on Agalejia 

 naevia, followed bj' another short paper in 1905. In 1909, she 

 published her complete account of the spermatogenesis of this tube- 

 weaving spider. In this careful work, Wallace points out the 

 discrepancies which exist in the conclusions of the previous investi- 

 gators and she attempts to bring the observations of the earlier 

 workers into line with the results which she has obtained by her 

 own study of Agalena naevia. 



A number of questions were still left in doubt by Wallace, 

 and it was at the suggestion of Professor Peteunkevitch , that I 

 took up a study of the spermatogenesis of a jumping spider in order 

 to clear up, if possible, the whole subject. As the work went for- 

 ward it became evident that a more comprehensive survey of the 

 field was needed than that which one species would afford; accord- 

 ingly species of 13 families of spiders were examined including the 

 following : 



Family Species 



Aviculariidae Dugesiella lientzi 



Dictynidae Amaurohius sylvestris 



Pholcidae Spermaphora meridionalis 



Drassidae CaUilepis imhecilla 



Linyphidae Linyphia marginata 



Argiopidae Epeira sericata {sclopeiaria) 



Thornisidae Xysticus triguttatus 



Clubionidae Anyphaena saltabunda 



Agalenidae Agalena naevia 



Pisauridae Dolomedes fontanus 



Lycosidae Lycosa communis 



Oxyopidae Oxyopes salticus 



Attidae Maevia vittata. 



Identification has either been made by Professor Peteunkevitch 

 or verified by him. 



The plan of the work has been to study the spermatogenesis 

 of some highly specialized form, and for reasons given later the 

 jumping spider, Maevia vittata, was selected, and then to follow the 

 course of the chromosomes in some very primitive type, such as 

 Amaurohius sylvestris. With this as a basis, the spermatogenesis of 

 11 other families was studied in order to extend and check the 

 results obtained for Maevia and Amaurohius. 



It gives me great pleasure to express my indebtedness to Pro- 

 fessor Peteunkevitch, not only for the interest he has shown in 



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