THE SPOROZOA 



305 



and even in distilled water they swell up and become globu- 

 lar. The pointed extremity of the chlamydospore 

 is occupied by a clear space, about 5-6 /A in length, 

 in which a delicate spiral striation can be seen in 

 the fresh condition. The rounded end of the spore 

 is almost filled by a large oval nucleus, containing a 

 distinct nuclear corpuscle. The median portion of 

 the spore is occupied by protoplasm with coarse 

 granules. All the chlamydospores have the same 

 structure. 



The spirally striated body situated at the pointed 

 end of the chlamydospore has great resemblance to 

 a polar capsule of a Myxosporidian spore, but it 

 is by no means certain how far the similarity ex- 

 tends. The most convincing proof of their similar 

 nature would be the extrusion of the filament, 

 which in Myxosporidia can be brought about arti- 

 ficially by a great number of reagents. It has 

 been asserted by some investigators that a filament 

 is extruded from the capsule of the Sarcosporidia 

 also, and in support of this state- 

 ment Van Eecke has published a 

 figure, 1 which has had the effect of 

 leading competent authorities to 

 doubt the fact (see Laveran and 

 Mesnil [119], p. 247; Liihe [5], 



Fio. 121. 



Sarcocystis hueti (Blanchard), from 

 the muscles of Otaria californica. a, 

 muscle-fibre containing a parasite, the 

 body of which is chiefly made up of a 

 vast number of gymnospores. b, clumps 

 of gymnospores, each clump contained 

 in an alveolus limited by a delicate mem- 

 brane, c, different stages of the navi- 

 cular gymnospores. (From Wasielewski, 

 after Balbiani.) 



a 



FIG. 122. 



Spores of Sarcocystis tendla, Raill., from 

 the sheep, a, spore in the fresh condition, 

 showing a clear nucleus (n) and a striated 

 body or capsule (c). ft, spore stained by 

 Heidenhain's Iron Haematoxylin method ; 

 the nucleus (n) shows a central karyosome ; 

 the striations of the polar capsule (c) are not 

 visible. (After Laveran and Mesnil.) 



1 Reproduced by Wasielewski [7] (Fig. 107, p. 125). Eight spores are shown, 

 three of them with extruded filaments ; of the latter, one has a single filament at the 

 pointed end ; the second two filaments at the pointed end ; and the third a filament 

 at each end. In the discussion following the reading of Koch's memoir [118], Wasie- 

 lewsky has recently affirmed positively the extrusion of a polar filament from the spore. 



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