Class 3. Qrega/rmida. 



97 



Fig. 56. CocciMv/m oviforme, A — B encysted, 

 C — D formation of sporea and falciform young. — 

 After Leuckart. 



food, the cyst wall apparently dissolves and the young wander thi'ough the 

 bile ducts into the liver and there develop into Ooccidia. 



3. Embedded in the trans- 

 verse muscle fibres of many 

 Mammalia, e.g., very frequently 

 in the Pig, there occur small 

 bodies, the so-called Rainey's 

 or Miescher's corpuscles 

 (Sarcocystis). They are cylin- 

 di-ioal or spindle-shaped bodies, 

 varying in length (up to several 

 m/m.), each enclosed in a single 

 musclefibre. Eachis surrounded 

 by a coat, and consists of a 

 protoplasmic mass containing 



a large number of small falciform young ; the latter are arranged in groups, 

 each suiTOunded by a thin mem.- j 2 



brane. Rainey's sacs are now usually 

 regarded as organisms allied to the 

 Gregarines ; the grotips of falciform 

 young are considered com.parable to 

 the spores of a Gregariue. If this 

 comparison prove correct it would stUl 

 be a peculiarity of these organisms that 

 the formation of the spores and falci- 

 form young begins very early, before 

 the growth of the sac is complete (the 

 falciform young occurring even in 

 very small fornas), and goes on quite 

 gradually, so that fresh portions of 

 protoplasm are constantly formuig 

 spores and falciform yoiuig. The 

 method of infection is unknown : they 



do not usually appear to be very in- „.-„,_.. 



. . J J i.1 1. J. -L ^'S'- °'- 1 Jsaineyian sac m a muscle 



jurious ; and so far they have not been fib^e, 2 the tip of one highly magnified, 3 



found in Man. various falciform young.— After Leuckart. 



