18 PORTER. 
EXPLANATION OF PLATE II. 
Fic. 16. Section of a cyst containing sporogonia in several stages of develop- 
ment. X 400. 
cys, the shrivelled cyst. 
8, former position of the wall of the cyst as determined by the surrounding tissue. 
a, see explanation of Fig. 17. 
Fic. 17. Group of sporogonia, seen at a in Fig. 16, more highly magnified. X 1540. 
Fics. 18, 19. Recently formed sporogonia killed with Perenyi’s fluid stained 
with borax carmine. X 3100. ‘ 
Fic. 20. Sporogonia after the first division of the nucleus; treatment of the 
preparation the same as that of Fig. 18. X 3100. 
a, immediately after the division of the nucleus has taken place. 
8, a little later stage than that shown at a. 
Fic. 21. Sporogonium after the second division of the nucleus; otherwise 
same as FIG. 20. X 3100. 
Fic. 22. Sporocyst showing early stage in the development of the spores. 
X 3100. Two sac-like envelopes already formed ; the outer one (a) the capsule ; 
the inner one (8) the cyst. 
a, thickening of the cuticula at the mouth of the capsule. 
8, narrow neck of inner cyst. 
Fic. 23. Sporocyst flattened somewhat by pressure of cover glass. Spores 
in a little more advanced stage than in Fig. 22. X 3100. 
Fic. 24. Cross section through the middle of sporocyst and contents in the 
condition represented in Fig. 23. X 3100. 
Fic. 25. Cross section of another sporocyst of the same age as Fig. 24. 
Fic. 26. Inner cyst of sporocyst ; spores not yet fully matured; four of them 
have been squeezed out. X 3100. 
pr pl, thread-like portions of contents of cyst not employed in formation of 
spores. 
Fic. 27. Two spores forced out of cyst. X 3100. 
a, clear area due to shrinkage of nucleus. 
Fic. 28. Two abnormal spores. X 3100. 
Fic. 29. Mature sporocyst containing seven spores, one in process of emerg- 
ing: the eighth spore had already escaped. 
a, thickening of cuticula around the opening at upper end of capsule. 
Fic. 30. Mature sporocyst with seven spores, three of them leaving the cyst. 
Probably one spore had already entirely escaped. X 3100. 
Fic. 31. Mature sporocyst showing a frequent arrangement of spores in cyst. 
Stained with Bismarck brown. X 3100. 
Fic. 32. Inner cyst showing irregular arrangement of the eight spores, some 
of which are considerably curved. Stained in Bismarck brown. X 3100. 
Fic. 33. Portion of a section through a gregarine cyst showing sections 
through sporocysts in various directions. X I100. 
Fic. 34. Cross section of intestine of Clymenella torquata showing large 
amoeboid cells, possibly early amoeba-like stage of this gregarine. X 77. 
Fic. 35. Amoeboid cell in wall of intestine near its outer body-cavity surface, 
more highly magnified. X 350. 
Fic. 36. Another amoeboid cell of larger size and more deeply imbedded in 
the wall of the intestine. X 350. 
