102 
ZOOLOGICAL EXERCISES. 
ring, or ganglion, sending backward two or 
more branches. 
GEPHYREA. Body elongate or oval, indistinctly seg- 
mented ; integument very rarely containing cal- 
careous spicules; mouth with a retractile pro- 
boseis ; nervous system an cesophageal ring, with 
a dorsal ganglion, and a simple ventral cord. 
ANNELIDA. Body elongate, segmented; appendages, 
if present, never jointed, and never modified into 
jaws; integument generally with bristles; body 
cavity divided by septa into chambers, each of 
which contains a pair of segmental organs; a 
pseud-heemal system; nervous system a gan- 
gliated cesophageal collar, with a ventral double 
chain of ganglia. 
Catalogue of Worms of New Zealand.—Hutton, Trans. N.Z. Inst,, 
XI, p. 314, and XII, 
New Zealand Aphrodite.—T, W. Kirk, Trans. N.Z. Inst., XI., p. 397. 
The New Zealand Rotifera have not yet been catalogued. 
ECHINODERMATA.—Body unsegmented, more or less 
radially symmetrical. Integument with calcareous plates 
or spicules. A water-vascular system, which often func- 
tions as a locomotive apparatus.. Nervous system an 
cesophageal ring with radiating branches. 
CRINOIDEA. Body stalked during the whole or part 
of its life. Mostly extinct. 
STELLERIDA. Body lobed or stellate, free ; integument 
coriaceous, with calcareous plates. 
ECHINOIDEA. Body more or less rounded, free, en- 
closed in a calcareous test. 
HOoLOTHUROIDEA. Body vermiform ; integument cori- 
aceous, with calcareous spicule. 
