14d 



GUIDE TO THE CORAL GALLERY. 



single large cell. When the latter is fertilised by one of the male 

 gametes, the resulting zygote forms round itself a cyst, while the 

 contents break up into sporoblasts, each of which forms a double 

 envelope and becomes a true spore. Lastly, the spores divide, each 

 into two sporozoites. 



Fig. 10c. shows a section of the liver of a rabbit suffering from 

 Coccidiosis, due to the presence of Goccidium oviforme. 



Fig. IOd, a — e shows a zygote dividing up into spores, / being 

 a spore with two sporozoites. 



(3) Myxosporidia and Sarcosporidia. Myxosporidia are 

 mostly parasitic in fishes, in which they are commonly situated 

 'beneath the epidermis of the gills and fins, and in the wall of the 

 bladder. The body of the parasite is an Amoeba-like cell (Fig. IOe), 



Pig. IOd. 



Spore formation \uCoccidmm oviforme from liver of rabbit. Highly magnified ; 

 a, encysted individual (zygote) ; h, zygote contracting to a sphere ; c, d, c, 

 division into spores ; /, single spore, more highly magnified. After 

 Balbiani. (From Minchin's Sporozoa, Lankester's Treatise on Zoology.) 



which may multiply by dividing into two, or by forming bnds ; 

 quite early in life spores are formed in the cell body. The spores 

 contain peculiar pear-shaped bodies, each of which contains a coiled 

 thread. When another animal swallows the spores, the stimulus of 

 the digestive juices causes the extension of the coiled filaments, which 

 thereupon attach the spore to the wall of the gut. 



The Sarcosporidia are found }>arasitic in the striped muscle fibres 

 of cattle and pigs, in which animals nniltiplication and growth of the 

 parasite often sets up abscesses in the tissues. 



C4) Parasites of the Blood. 



See Models and Diagrams in the Central Hall. 



One of the most important discoveries of recent times, and one 

 certain to have extremely beneficial consequences,* has been that of 



* On the occasion of the delivery of the inaugural address of Prof. E. A. 

 Minchin, Professor of Protozoology, Sir Lauder Brunton pointed out that 

 the darkness of darkest Africa was probably in no small measure due to the 

 prevalence of biting flies, ticks, &c,, infected with Protozoan parasites, Not 



