40 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE V. 



Boveria subcylindrica, gen. et sp. nov. 



Figs. 47-56, 60a, 61, 64, 66: Hermann's fluid, iron-haematoxylin. Figs. 57, 

 58, 60b, 62, 63: Boveri's picro-acetic, iron-haematoxylin. 



Fig. 47. Superficial longitudinal section showing longitudinal rows of body 

 cilia with basal bodies (6^), peristomal cilia with basal bodies {b-^), 

 mouth {m), and pharynx (p). Z. oc. 4, ob. 1.5, cam. 



Fig. 48. Median longitudinal section showing mouth [ni), contractile vacu- 

 ole {v), food mass (/), macronucleus (n^), micronucleus (^a). 

 dense ectoplasm and alveolar entoplasm. Z. oc. 4, ob. 1.5, cam. 



Fig. 49. Peristomal spire, from a superficial transverse section of the peri- 

 stome, showing only the basal bodies of the peristomal cilia, 

 and the contractile vacuole (v) discharging. Z. oc. 8, ob. 1.5, 

 cam. 



Fig. 50. Median transverse section through the macronucleus [n^. 



Fig. 51. Transverse section through micronucleus [n^). Z. oc. 4, ob. 1.5, 

 cam. 



Fig. 52. Superficial transverse section of aboral end of the animal, showing 

 converging rows of body cilia, basal bodies {b^) only being 

 shown. Z. oc. 8, ob. 1.5, cam. 



Figs. 53-55. Macronucleus showing nucleoli [e] varying in form and posi- 

 tion. Z. oc. 4 and 8, ob. 1.5, cam. 



Figs. 56 and 57. Section showing stages in division of the micronucleus [n^]. 

 Z. oc. 4, ob. 1.5, cam. 



Figs. 58-60. Nucleus in early stages of division, showing micronucleus in 



division [n^). Z. oc. 4, ob. 1.5, cam. 

 Figs. 61-66. Sections showing advanced division stages corresponding to 



those shown in figs. 40-45, Plate IV. Z. oc. 4, ob. 1.5, cam. 

 Fig. 67, a-j. Sections showing division stages of micronuclei arranged in 

 incomplete series. 



