LIFE-HISTORY OF THE PARASITES OP MALARIA. 579 



Figs, 53— 67.— Development of Hsemomeuas prsecox iu tissues of 

 Anoplieles. 



Fig. 53. — Zygote approaching inner surface of stomach wall. 



Fig. 54. — Zygote piercing stomach walL 



Figs. 55, 56.— Zygotes affixed to outer coat of stomach. They possess 



au apparently alveolar structure, and still contain granules of melanin. 

 Fig. 57. — Zygote increases in size. 

 Figs. 58, 59.— Zygotes increasing in size and dividing into meres, which 



become blastophores bearing blasts. 

 Fig. 60. — A single blastophore bearing a number of blasts affixed to it, 



each by one extremity. 

 Fig. 61. — Stomach seen by a low power, and dotted with a number of 



mature zygotes. 

 Fig. 62. — A fully mature zygote packed with blasts, some of which are 



escaping from a rupture in the capsule. 

 Fig. 63, — Free blasts in body. cavity of Anopheles, 

 Fig. 64. — Blasts entering capsule of salivary gland; also lying within 



salivary cells and duct. 

 Fig. 65. — Junction of ducts of three lobes of salivary gland of one side, 



with blasts. 

 Fig. 66. — Blasts escaping from extremity of middle stylet or tongue of 



Anopheles. 

 Fig. 67. — Capsule of a mature zygote containing five large black bodies, 



provisionally known as " black spores," 



Note. — We may point out that the development of the remaining human 

 species in Anopheles and of H. relicta in Culex are almost identical with 

 those of H. prsecox given in the plates. 



All the figures, except Fig. 61, are magnified 2500 diameters. F'ig, 61 

 is magnified about 70 diameters, the stomach tissues being flattened and 

 extended by the cover-glass. 



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