JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE VT, 



Illustrating Dr. Van Beneden's memoir on a new species of 



Gregarina. 



Pig. 

 1 and 2. — Gre^rinae of middle size, as seen under a power of about 250 

 diameters. 



3. — Some individuals of the natural size. 



4. — Colossal Gregariua seen with a lens. 



5. — Anterior extremity of the body of an individual of average size, mag- 

 nified ^iO diameters. 



6. — a, h, c, d. Successive forms assumed by the same nucleus of a large 

 individual. The nucleoli are seen to be modified, both as to number 

 and aspect. 350 diameters. 



7. — a, h, c, d, e,f. Successive stages of the nucleus of a young indivi- 

 dual. These modifications were produced successively in the order 

 of the letters in the space of twenty-five minutes. 300 diameters. 



S. — A cyst of a Gregarina where no appearance of division has yet been 

 produced. The membrane of the cyst is still very thin. It is closely 

 applied to the granular mass. 



9 — 10. — The same cyst which has undergone, under the microscope, the 

 changes drawn. 



11 — 12. — The same cyst showing the modifications taking place under the 

 microscope, in the form of the spheres. 



13. — Two cysts of the second generation, surrounded by the residue of the 

 capsule of the primitive cyst. Each of them is surrounded by a 

 proper membrane, and is itself in course of division. 



l-i. — Idem. The spheres of the third generation are completely separated 

 from one auot' er, and well rounded. 



