VINCULARID#. 189 
Genus, CALWELLIA—Wyv. Thomson. 
Cells in pairs, joined back to back ; each pair of cells arising by 
tubular prolongations from the pair next but one below it; each pair 
having a direction at right angles to the next ; at a bifurcation, each 
cell of ‘the primary pair giving off a secondary pair; ovicell, sub- 
globular, placed immediately above and behind the posterior margin of 
the_cell aperture. 
New Zealand and Australia. 
C. bicornis, Wyv. Thomson, Nat. Hist. Rev., 1858, O.7-I.S., vii., 
p. 153. The only known species. 
Genus, DIMETOPIA—Busk. 
_ Cells joined back to back ; aperture oblique ; each pair facing at 
right angles to those above and below; at a bifurcation, the pair being 
disjoined, each of the disjoined cells gives off a secondary pair. 
Australia'and New Zealand only. 
D. spicata, Busk, Zc, p. 35. Cells imfundibuliform ; margin 
thickened, with numerous equidistant, elongated, acute spines; white _ 
and transparent, forming thick tufts about 14 to 3 inches or more in 
height ; color pink when alive. 
Lyall Bay. Bass Straits, 45 fathoms. 
D. cornuta, Busk, 2c, p. 35. Cells contracted below the middle ; 
aperture oblique, wide above; a strong conical process on each side 
above ; one or two long projecting spines in front, inserted below the 
margin ; branches narrower than the former ; yellowish ; tufts loose. 
Lyall Bay. Bass Straits, 45 fathoms. 
FAMILY—VINCULARID. 
Zoarium rigid, calcareous, unarticulated. Cells disposed alternately 
round an imaginary axis, forming dichotomously dividing branches. 
Surface of polyzoary not areolated. 
Genus, VINCULARIA—Defrance. 
Branches of zoarium not tubular; front of cells surrounded by a 
raised border, arcuate above, nearly straight below ; ovicells, immersed, 
opening above the mouth of the cell upon which they are placed.. 
V. neo-zelandica, 2usk, O./-MS., NS. 1, p. 155, pl 34, 
fi. 5. Zoarium simple, rooted at the base by radical tubes ; arez of 
cells sub-pyriform ; anterior wall perforated ; margins smooth ; orifice 
arched above ; lower lip with a broad central denticle. 
New Zealand. (Dr. Lyall.) 
