580 MONTG OMER \ '. 



EXPLANATION OF PLATE XXIX. 

 Figs, ^oo-^tb: Egg development of Piscicola rapax. 



Figs. 300-304. Transverse sections of ovarial acini (alcohol, sol. sublimate ; 

 Ehrl. haematoxylin, i hr. ; eosin, 5 min.). 



Figs. 305 and 306. Germinal vesicles (as in 300). 



Fig. 307. Ovum (as in 300). 



Fig. 308. Germinal vesicle (as in 300). 



Figs. 309 and 310. Ova (as in 300). 



Fig. 311. First pole spindle in the ovum ; only one attraction sphere is drawn, 

 and that only partially, the dotted line showing how far its rays extend into the 

 cytoplasm (as in 300). 



Figs. 312 and 313. Germinal vesicles (alcohol, sol. sublimate ; Mayer's acid 

 carmine, 20 min.; Lyons blue, 5 min.). 



Fig. 314. Germinal vesicle; the dotted line shows the extension of the 

 indented surface of the nucleolus, the unstained small oval space being the exter- 

 nal opening into it (alcohol, sol. sublimate ; fuchsine, 10 min.). 



Fig. 315. Germinal vesicle (Flemming's fluid; Ehrl. haematoxylin, 2 hrs. ; 

 eosin, 10 min.). 



Fig. 316. Ovum with attraction spheres at opposite ends of the nucleus; the 

 rays of only one attraction sphere drawn (alcohol, sol. sublimate; Ehrl. haema- 

 toxylin, 40 min. ; eosin, 5^ min.). 



Figs. 31^0-^24 : Mesenchym cells of Cerebratulus lacteus (fixation with alcohol. 



sol. sublimate). 



Fig. 315a. Nucleus (Ehrlich-Biondi stain, 2 hrs.). 



Figs. 316a and 317. Nuclear division in free cells (Ehrl. haematoxylin, 2 

 hrs. ; eosin, 5 min). 



Figs. 318 and 319. Nuclei (as in 317). 

 Figs. 320-324. Whole cells (as in 317). 



*Figs. 325-337 ■■ Nuclei of the muscle cells of the longitudinal musculature of 



Piscicola rapax. 

 Fig. 325 (aq. sol. sublimate). 



Fig. 326 (alcohol, sol. sublimate; Ehrl. haematoxylin, l hr. ; eosin, 5 min.). 

 Fig. 327 (Flemming's fluid, i hr.). 

 Fig. 328 (aq. sol sublimate). 

 Fig. 329 (as in 327). 

 Figs. 330 and 331 (as in 328). 

 Fig. 332 (as in 327). 

 •f^l^- ZZZ (Flemming's fluid, i hr.). 

 Figs. 334 and 335 (as in 326). 

 Figs. 336 and 337 (as in 333). 



