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. 10 d, 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. 10e), 
Fig. 10d. 
a b c d e f 
Spore formation in Goccidium oviforme from liver of rabbit. Highly magnified ; 
a, encysted individual (zygote) ; b, zygote contracting to a sphere ; c, d, e , 
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 buds ; 
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 parasitic in the striped muscle fibres 
of cattle and pigs, in which animals multiplication and growth of the 
parasite often sets up abscesses in the tissues. 
(4) 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 
