300 J. JACKSON CLARKE. 



EXPLANATION OF PLATES 31—33, 



Illustrating Mr. J. Jackson Clarke's " Observations on Various 



Sporozoa." 



Fig. 1. — Section through a syzygium of Moaocystis agilis, X 500 

 diaiiis. From the nuclear masses, a, in the central part of each half of the syzy- 

 gium numerous moniliform threads, b, of chromatin are directed towards the 

 periphery, where are many small nuclei and nuclear spindles, c. 



Fig. 2. — Section through part of the periphery of a syzygium of Mono- 

 cystis agilis, X 1000. From left to right are (1) the connective-tissue 

 capsule, a, (2) sporogonia, c, (3) part of the body of the parasite with gregarina 

 corpuscles, nuclear spindles, 6, and particles of chromatin, a, round some of 

 which a covering of protoplasm has collected. 



Fig. 3. — Two sporogonia of Monocystis magna, x 1000 diams. The 

 nucleus of the lower of the two shows achromatic filaments, ^, joining the par- 

 ticles of chromatin. The body, a, of the structure stained with eosin. 



Fig. 4. — A free example of Klossia from the grey slug, x 1000 diams. 

 Fresh specimen. Nucleus, a, nucleolus, b. x 3000. 



Fig. 5. — An epithelial cell in the kidney of a grey slug containing a parasite 

 subdivided into sporocysts. Some of the sickles contain a single nucleus- 

 There are no residual bodies. X 1000 diams. From a section. 



Fig. 6. — A cell, a, from the kidney of a slug containing a parasite in the pro- 

 cess of swarm-sporing. There are six smaller parasites, e, in the protoplasm 

 of the cell. b. Large sickle-shaped sporogonia, c. The same dividing, d. 

 Undivided central part. X 1000 diams. 



Fig. 7. — A free Klossia showing swarm-sporing with some sickles, b, de- 

 tached. Fresh teasing. X 750 diams. 



Fig. 8. — Part of the epithelial lining of a coccidial cystadenoma of a rabbit's 

 liver, a, a'. Parasites witli two and three nuclei respectively, b. A parasite 

 subdivided into sporogonia. x 1000 diams. 



Fig. 9. — A round granular and an oval eucapsuled coccidium. a, a'. 

 Nuclear body (red), b. Cytoplasm, c. Definitive capsule. 1000 diams. 



Fig. 10. — An intra-cellular coccidium with a "Geflammte-Kern" at a. 

 X 1000 diams. 



Fig. 11. — An intra-cellular coccidium, the nucleus, a, of which shows radi- 

 ating bars of chromatin. X 1000 diams. 



