664 C. H. MARTIN. 
Fria. 5.—The last stage in the division of the macronucleus between 
a proboscidiform and a vermiform bud. (4 comp. oc. + 2 mm. apochr.) 
Fria. 6.—Early stage in the development of the ciliated embryos in 
a proboscidiform individual. The rounding-off of the embryonic mass. 
The proboscis is not retracted. (2 [Searcher] comp. oc. + 2 mm. apochr.) 
Fra. 7.—Two proboscidiform individuals showing the later stages in 
the development of the ciliated embryos. The proboscides are retracted. 
(2 [Searcher] comp. oc. + 2 mm. apochr.) 
Fia. 8.—Dividing ciliate embryo from the brood-pouch of a pro- 
boscidiform individual. (6 comp. oc. + 2 mm. apochr.) 
Fie. 9.—Part of the brood-pouch of a proboscidiform individual 
showing the two stages of the ciliate embryo. (2 [Searcher] comp. oc., 
+ 2 mm. apochr.) 
Fie. 10—A vermiform individual containing ciliate embryos. (2 
[Searcher] comp. oc. + 2 mm. apochr.) 
Fra. 11.—A free ciliate embryo. (6 comp. oc. + 2 mm. apochr.) 
Fie. 12—A young proboscidiform individual. The whole of the 
proboscis is not drawn. (6 comp. oc. + 2 mm. apochr.) 
