Germ Cells of Leptinotarsa Signaticollis. 



207 



Fig. 38. Nurse cell from the pupal ovary showing the characteristic configura- 

 tion of the nucleus. 



Fig. 39. Synizesis in the ovocyte. 

 Figs. 40-44 inclusive. Stages following synizesis. 

 Fig. 45. Synizesis in the spermatocyte. 

 Figs. 46, 47, 48. Stages following synizesis. 



Fig. 49. First stage in the re-construction of the spireme; following the resting 

 period. 



Figs. 50, 51. Spireme of the prophase of the first maturation division. 



Figs. 52, 53. First spermatocyte prophases. 



Fig. 54. Side view of first spermatocyte spindle in early anaphase. 



Figs. 55, 56. Polar view of first spermatocyte spindles at metaphase. 



Fig. 57. Telophase of the first spermatocyte division. 



Fig. 58. Telophase of the second spermatocyte division. 



Figs. 59, 60. Second spermaocyte metaphases. 



Fig. 61. Stage in the development of the sermatozoan in which approximately 

 the reduced number of chromatin bodies (chromosomes?) appear in the head. 



Fig. 62. Telophase of the first spermatocyte division in L. decemlineata. 



Fig. 63. Anaphase of the first spermatocyte division in L. decemlineata. 



Fig. 64. Polar view of the telophase of the first division in L. decemlineataa. 



Fig. 65. Resting stage of the ovocyte of L. decemlineata. 



Fig. 66. Resting stage of the spermatocyte in L. decemlineata. 



Figs. 67, 68, 69. Three stages of amitosis in the spermatogonia of L. Signati- 

 collis. 



ABBREVIATIONS. 



a. c. — apical cell 



am. — amitosis 



e. c— egg cell 



ep. c. — epithelial cell 



gr. — granule 



g. c. — germ cell 



I. m. — limiting membrane 



m. — mitotic figure 



71. c. — nurse cell 

 n, stm. — nutritive stream 

 n. str. — nutritive string (egg string) 

 p. sh. — peritoneal sheath 

 0. St. c. — ovariole stalk cell 

 t. pr. — tunica propria 

 z.— chromatin nucleolus of the resting 

 stage. 



The figures in the plates are camera drawings made at stage level with the fol- 

 lowing combinations of Zeiss apochromatic objectives and compensating eye- 

 pieces. 



T^ : Figs. 19, 20-23 inclusive, 33, 34^43 inclusive, 49-69 inclusive. 

 T^ : Fig. 44. 

 V- : Figs. 24-32 inclusive. 



Figs. 1-18 inclusive. 



