SYNOPSIS OF THE PRINCIPAL GROUPS. 101 
described by Dr. Gray in Dieffenbach’s Travels in New 
Zealand, II., p. 295; but it is doubtful whether they can be 
recognised again. 
New Zealand Sertularians.—Hutton, Trans. N.Z. Inst., V., p. 256. 
New Zealand Hydroideze.—Coughtrey, Trans. N.Z. Inst., VII., p. 281, 
and VIII., p. 298. 
New Genera and Species of Hydroida.—Allman, Pro. Lin. Soe., XII., 
p. 251. 
New Hydroids from Australia and New Zealand.—D’ Arcy Thompson, 
Ann. Nat. Hist., series 5, vol. III., p. 95. 
Sea Anemones of New Zealand.—Hutton, Trans. N.Z. Inst., XI, 
| p. 308. 
A New Species of Millepora.—Tenison-Woods, Trans. N.Z. Inst., XI., 
p. 345. 
Contributions to the Celenterate Fauna of New Zealand.—Hutton, 
Trans. N.Z. Inst., XII. 
VERMES.— Body more or less elongated, bilaterally sym- 
metrical, Alimentary canal, when present, entirely 
shut off from the somatic cavity. No jointed feet. 
Integument generally with chitinous outgrowths. 
PLATYELMIA. Body more or less flattened, not seg- 
mented ; no true body cavity ; surface generally 
ciliated ; a water-vascular system ; nervous sys- 
tem obscure, or two pharyngeal ganglia united 
by a commissure, and sending backward two 
lateral filaments. 
RoTiIFERA. Body minute, indistinctly segmented ; a 
water-vascular system, and a ciliated cephalic 
disc ; body cavity present; nervous system a 
single or double cervical ganglion, giving off 
lateral filaments. 
NEMATOIDEA. Body elongated, not segmented, cylin- 
drical; never ciliated at any period of life; a 
body cavity; nervous system an cesophageal 
