EXPLANATION OF PLATE XXX. 
Annulella gemmata, nov. gen. et sp. 
Fic. 1.—Young sessile polyp shortly after fixation, with four ten- 
3) 
tacles, and thin perisare covering the basal disc (Fuss- 
platte), X 75. 06.b. basal bulb; deb. coat of mucus 
and debris. 
2.—Adult polyp with twelve tentacles, lateral buds (bud 1 & 2, 
the latter possibly a young gonophore), and two basal 
bulbs; 0.6. 1 & 2, the former terminal. In both bulbs 
the internal coenosarc-sac and external chitinous invest- 
ment are shown, X 55. 
3.—Adult polyp with two hypostomes, ~. I & 2, possibly 
in process of longitudinal fission, and two basal bulbs; 
b.b. 1 & 2, the former terminal, showing clearly the 
narrow connecting neck, and the perisarc investment, 
X 55. 
4.—Median longitudinal section of bud attached to wall of 
polyp, X 230. cav. large central cavity in communi- 
cation with coelenteron; cut. cuticle; mes. meso- 
gloea; ect. ectoderm ; end. endoderm. 
5.—Optical section of bud after its release from polyp, and 
before it has settled down, X 230. cav. central cavity, 
now much constricted by increase of endoderm cells; 
cut. cuticle ; mes. mesogloea; end. endoderm; ect. ecto- 
derm; the pale area at the left pole (the end formerly 
attached) shows the position of the opening which pro- 
bably persists as the mouth of the polyp. 
6.—Proximal end of an adult polyp, showing the origin of a 
new basal bulb, X 75. 4. lower end of hydranth body; 
e.h, ectoderm of hydranth; mes. mesogloea; n. 2, con- 
striction beginning to mark off neck of new basal 
bulb; b.b. basal bulb in process of differentiation ; 
e.b.b. ectoderm of basal bulb; m. debrisladen mucus; 
n. 1, ruptured tissues indicating the broken neck of an 
earlier basal bulb, whence the polyp has escaped. 
