30 
D.P. GORDON AND P.D. TAYLOR 
Figs 71-73 Cellaria minus sp. noy., IGNS BZ 193, holotype; 71, branch, x 62; 72, alternating zooids, x 161; 73, granular cryptocyst and opesia-orifice, x 
304. 
the Cellariidae is unsatisfactory, both within the type genus Cellaria 
Ellis & Solander and among a number of other genera insofar as 
their limits are not well circumscribed. Beginning with Busk (1884), 
attempts have been made to segregate species of Cellaria sensu lato 
into informal, or even formal, groupings based on various combina- 
tions of autozooidal shape, method of branching, and size of 
avicularium. Hayward (1995) pointed out the limitations of some of 
these attempts, but Cellaria as presently circumscribed is too broad 
in relation to the characters of the northeastern Atlantic type species. 
The following new species, although based on limited material, is 
regarded as sufficiently similar in branching and avicularian charac- 
ters to Recent Cellaria tectiformis Hayward & Cook, 1979 as to 
justify the establishment of a new genus based on these two species. 
The characters are: (1) all branching in a single plane; (2) bifurca- 
tions lacking articulations or, if an articulation develops, it is based 
on a subsequent fracture (and securing of both sides of the fracture 
by frontally produced rhizoids); (3) axial vicarious avicularia; and 
(4) complete lack of any mandibular pivots, ridges, or condyles. It is 
possible that additional fossil species may be attributable to 
Smitticellaria: Maastrichtian-Danian Vincularia microstoma Mars- 
son, 1887 (Denmark and Germany) and Danian Onychocella colum- 
ella Berthelsen, 1962 (Denmark and Germany) ought to be examined 
in this regard (see descriptions and illustrations in Berthelsen (1962) 
and Voigt (1987)). 
Range. Thanetian to Recent. 
Smitticellaria morioriana sp. nov. Figs 82-84 
HOLoTyPE. IGNS BZ 196-1, from Pukekio, Chatham Island. 
PARATYPES. IGNS BZ 196-2, 196-3, 196-4. 
NAME. The name evokes the indigenous Polynesian inhabitants of 
the Chatham Islands, the Moriori. 
DESCRIPTION. Colony erect, dichotomously branching, non-ar- 
ticulated, the stem and branches cylindrical, 0.33-0.49 mm in 
diameter. Autozooids alternating, disposed in 8 longitudinal series, 
reducing to 6 after a bifurcation, the boundaries evidenced by thin 
lines of calcification where well-preserved; shaped more-or-less 
like a 4-sided diamond with each corner acute or the distal and 
proximal ends very slightly rounded-truncate; length = 0.35—0.40 
mm, width = 0.20—0.34 mm. Cryptocyst concave, more so towards 
the opesia-orifice, the surface minutely granular-tubercular where 
well-preserved. Opesia-orifice wider (0.09—0.10 mm) than long 
(0.06—-0.07 mm), transversely bean-shaped, the proximal rim with 
an inversely crescentic part, the ends of which project as denticles. 
Vicarious avicularia occurring at a bifurcation in both the inner and 
outer angles; widest proximally, narrowing to a lingulate rostrum 
with an extensive palate and rounded tip; only a single subcircular 
foramen occurs in the centre of the avicularium. Ovicells with a 
small rounded opening occurring between the distal border and the 
opesia of the maternal zooid. 
