418 LEFEVRE. 
EXPLANATION OF PLATE XXIX. 
All the figures of this plate were drawn from specimens mounted as whole 
objects. The test is only represented in Fig. 1. The buds were stained slightly 
in borax carmine, and were perfectly transparent. 
Fic. 1. Shows evagination of ectoderm and partition of stolon to form the 
bud-rudiment. X 170. 
Fic. 2. Slightly older rudiment, seen from right side. X 170. 
Fic. 3. Still older rudiment, seen from right side, and showing anterior elon- 
gation and constriction of the stolonic connection. Rudiment of dorsal tube is 
shown; that of pericardium is present, but is not drawn in the figure. X 170. 
Fic. 4. Young bud, seen from right side, at a stage when development of 
peribranchial cavity, pericardium, and digestive tract is well advanced. X 170. 
Fic. 5. Bud considerably older than the last, showing extensions of peri- 
branchial sacs, formation of branchial stigmata, and further development of diges- 
tive tract, pericardium, etc. X 170. 
