The spermatogenesis of Peripatus (Peripatopsis) balfouri. 



359 



Explanation of the Plates. 



Plates 19—25. 



Unless otherwise specified, all the figures are drawn with the aid 

 of the camera lucida, with the magnification aiïorded by a Zeiss ^|,2 

 homogeneous immersion objective, and the compensating ocular 6, length 

 of the tube of the microscope 180 mm; the figures were drawn at the 

 level of the microscope stage. 



Abbreviations employed. 



B. C blood-cell pseudoepithelium 

 C centrosome 



Chr chromosome 

 C.Mh cell membrane 

 Cii.F connective fibre 



C. P central pole of the cell, nucleus 

 or chromosome, as the case may be 



C. P. L linin fibre of the central 



pole of a chromosome 

 C. Sp central spindle 

 7). P distal pole of the cell, nucleus 



or chromosome, as the case ma}' be 

 D.P.L linin fibre of the distal 



pole of a chromosome 

 Fib fibre of fibre cell of testis 

 Fib.N nucleus of fibre cell 

 Fl flagellum of spermatozoon 

 Gl. C gland cell 

 Gl. C. V gland cell of vesica semi- 



nalis 

 (t.Z growth zone of the testis 

 H head of spermatozoon 

 Id. Z idiozome sphere 

 I. T interstitial connective tissue 

 L himen 



L. S linin spirem 



M muscle cell 



M. B mid-body or spermatozoon 



M. C muscle cell 



M.D maturation divisions 



M. F mantle fibre 



M.N muscle-cell nucleus 



JV^ nucleus 



n nucleolus 



n. 2 nucleolar structure of doubtful 



significance 

 N. C nurse cell 

 N. Gl nutritive globules or nurse 



cell 

 N. Mb nuclear membrane , 



S hyaline Spiess of spermatozoon 

 Sp. C first spermatocytes 

 Spg spermatogonium 

 T testis 



V vesica seminalis 

 Vac vacuole 

 Vas vas deferens 

 Yh. C nurse or yolk cell 

 Z.K Zwischenkörper 

 Yk. Gl yolk globule 



