. Bulletin of the Natural Histort Museum. Geology series. . Figs 71-73 Cellaria minus sp. nov., 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 b
. Bulletin of the Natural Histort Museum. Geology series. . Figs 71-73 Cellaria minus sp. nov., 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. Hay ward (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 Hay ward & 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 in
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