. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 216 THE FLUKES cysts move by wriggling movements, and absorb nourishment directly through the body wall. When they become over-dis- tended with the cercariae developing within them the wall ruptures and the cercariae are set free in the snail. The cercariae are dis- charged from the mollusc in " puffs," a number being periodically shot into the water. Examination of molluscs which were collected in the El Marg canal resulted in finding 17 species of cercariae, among them the cercari
. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 216 THE FLUKES cysts move by wriggling movements, and absorb nourishment directly through the body wall. When they become over-dis- tended with the cercariae developing within them the wall ruptures and the cercariae are set free in the snail. The cercariae are dis- charged from the mollusc in " puffs," a number being periodically shot into the water. Examination of molluscs which were collected in the El Marg canal resulted in finding 17 species of cercariae, among them the cercariae with forked tails and no bulb in the oesophagus, the. Fig. 67. Larval forms of blood flukes teased from liver of Planorbis; A, sporocyst containing daughter sporocysts; B, daughter sporocysts in liver tissue; C, cercaria. Note forked tail, characteristic of Schistosoma cercariae. (After Leipcr.) typical form of Schistosoma cercariae (Fig. 67C). Infected mol- luscs may continue to liberate cercariae for several weeks. Leiper later found that *S. hcematobium developed only in the species of Bullinus, the cercariae from Planorbis belonging to another species, S. mansoni. In Natal and the Transvaal a small. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa C. (Asa Crawford), 1891-1958. New York, J. Wiley
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
