The endosarc is semifluid and rich in granules mostly “reserve” in nature, often showing proteid or fat reactions.
Within the endosarc note a clear globular spot which contracts and expands, or pulsates, more or less regularly.
Note within the endosarc an oval transparent body which shows no pulsations.
The opening at the distal end of the proboscis, through which the endosarc is thrown out, is circular.
The endosarc is full of food-granules and reserve-granules (oil, colouring matter and proteid).
Note the small granules which move about within the endosarc.
The Intracapsular Sarcode (endosarc) or surrounding internal protoplasm.
(Gymnostomaceae); showing the reticulate arrangement of the endosarc, b, contractile vacuoles; c, the cuticle-lined pharynx.