THE NEMATOCYSTS OF TURBELLARIA. PNET 
Fic, 5.—Part of a transverse section through Microstoma lineare, 
showing nematocysts, some of which lie in vacuoles in the cells of the gut, 
while others have been carried through into the body cavity. Hp. Epidermis. 
B.C. Body cavity. 
Fic. 6.—Nematocyst surrounded by Phagocytes lying in the body cavity. 
Transverse section of Microstoma. 
Fie. 7,—Nematocyst lying under the skin. The wall of the vacuole has 
not yet been passed. Transverse section of Microstoma. 
Fic. 8.—Nematocyst lying in the testis of Microstoma lineare. Sperm. 
Spermatocyte. Ze. Testis. 
Fic. 9.—Exploded nematocyst lying in the vacuole under the skin, Trans- 
verse section of Microstoma. 
Fic. 10.—Outline of Microstoma lineare, showing the fully expanded 
pharynx when collecting Hydra. PA. Pharynx. 
Fie. 11.—Exploded Cordylophora nematocyst from the skin of Micro- 
stoma lineare. Only part of the thread is drawn. 
Fic. 12.—Exploded Cordylophora nematocyst lying in a vacuole under the 
skin. From a transverse section of Microstoma lineare. 
Fie. 13.—Longitudinal section through the proboscis of Polycystis 
negelil. 4mm. -+ 4 comp. oc. 
cire.musc. Circular muscle. Prod. Proboscis. ret.musc. Retractor muscles. 
Sph. Sphincter muscles. 
Fic. 14.——Part of epidermis of the proboscis of Polycystis negelii 
from a transverse section. 2mm. -+ 6 comp. oc. 
a. Rhabdites in epidermis of proboscis. 
6. Rhabdites in epidermis over the body. 
Fie. 15.—Part of a crushed Stenostoma sieboldii, showing Tubularia 
nematocyst in vacuole. 
Ne. Nematocyst. hk. Rhabdite. 
