CRISIIDA. 195 
Genus, RETEPORA—Lamark. 
Zoarium foliaceous, reticulate, infundibuliform or contorted, sub- 
pedunculate ; cells decumbent, opening on the upper surface only. 
R. cellulosa, Bush, Zc, ~. 93; R. reticulata, Johnston, Lc, p. 
353- Zoarium turbinate or crateriform, undulated, curled; cells sub- 
cylindrical ; surface smooth ; mouth sub-orbicular; lower lip projecting, 
with an avicularium on one side ; surface strongly vibicate ; a papilli- 
form avicularium at the lower angle of the fenestre ; white. 
Chatham Islands. Europe. Cape Horn. Australia. 
Genus, HEMESCHARA—Busk. 
Polyzoarium foliaceous, contorted, or laminar, composed of a 
single layer of cells disposed quincuncially, and opening on one surface 
only. 
H. fairchildi, Hutton, CMI, p. 100. Cells ovate, immersed, 
granular, punctured round the edge ; mouth simple ; lower lip straight 
or with a sinus ; occasionally with an avicularium on one side of the 
mouth ; ovicell globose, granular ; white. 
Cook Strait. 
Forming an easily detached crust on dead shells. 
Sub-Order— Cyclostomata. 
Cells tubular ; orifice terminal, of the same diameter as the cell, 
without any moveable apparatus for its closure ; consistence calcareous. 
FAMILY—CRISIIDZ. 
Zoarium divided into distinct internodes, usually connected by 
flexible joints ; attached by horny tubes. 
Genus, CRISIA—Lamouroux. 
Cells in two rows, sub-alternate ; aperture entire. 
C. patagonica, D’Ord., Voy. Amer. Merid., Polypiers, p. 7. Cells 
9-19, straight, very distinct ; branches arising from second or third cell ; 
joints black. 
Lyall Bay. S. America. 
C. edwardsiana, D’Orbigny, Lc, ~. 7; Busk, Cat. Cydost. 
Polyzoa tn B.M. (1875.) p. 5, fl. ., f- 5-8. Cells 2-3 in each internode, 
curved forwards; dorsal surface of internode convex, and usually 
ridged transversely ; branches arising from the first or lowest cell in the 
internode ; one or other of the cells in each internode usually armed 
with a long jointed spine ; ovicell lateral, pyriform (Busk.) 
Lyall Bay. Australia. S. America. 
