188 FARCIMINARIIDA. 
Genus, DIACHORIS—Busk. 
Cells disjunct, each connected with six others by tubuiar processes ; 
frond sometimes partially adnate and decumbent. 
A southern genus only. 
D. magellanica, Busk, 1c, p. 54. Cells semi-erect, open in 
front, oval; mouth circular, with a thickened and raised margin ; a 
pedunculate and articulated capitate avicularium attached to the margin 
of the cell near the top on each side ; ovicell ——-(?) (Busk). 
New Zealand (Lyall). Straits of Magellan. 
Frondose, with cells on both sides, also loosely adnate. 
D. inermis, Ausk, Zc, ~. 54. Cells decumbent, boat-shaped, 
entirely open ; two short marginal spines on each side near the top ; 
ovicell (?), avicularia ——(?) (Busk). 
New Zealand (Lyall). Straits of Magellan. 
D. buskiana, Hutton, CMM, ~. 94. Cells semi-erect, mem- 
branous, oval, open in front; mouth circular, with a projecting lower 
lip, and often a small nodule in the centre; nodule and lower lip 
granulated, the rest finely transversely striated ; connecting tubular pro- 
cesses short, about eleven to each cell. 
Lyall Bay. 
Encrusting seaweeds, loosely attached. 
FAMILY—FARCIMINARIID:. 
Zoarium continuous, erect, flexible, dichotomously branched ; 
branches cylindrical, the cells disposed round an imaginary axis. 
Genus, FARCIMINARIA—Busk. 
Corneous, flexible ; margin of cell much raised ; aperture occupying 
the whole front of the cell ; ovicell cucullate. 
A Southern genus only. 
F. aculeata, Busk, Zc., p. 33. Sides of the cells within the 
margin beset with furcate spines; ovicell cucullate, external ; surface 
aculeate (Busk). 
New Zealand (Lyall). Tasmania. 
F. blainvillii, Zamouroux ; Gray, 1c, i., p. 293. Sub-quad- 
rangular, formed of four series of ovate convex cells, with an oblong 
margined mouth, and scattered with flexible root-like fibres (Gray). 
New Zealand. (Dr. Sinclair.) 
FAMILY—GEMELLARIID/. 
Zoarium continuous, dichotomously branched ; branches with cells 
in opposite pairs. 
