ANTARCTIC BRYOZOA — ROGICK 229 



Genus Cellaria Ellis and Solander, 1786 



Harmer (1926, p. 335) characterized the geuus Cellaria (in which 

 he also included Melicerita as a synonym) as follows: 



Typically jointed, but occasionally unjointed, the zooecia usuallj^ opening all 

 round the cylindrical iuternodes, which may, however, be flattened. Body 

 cavities pear-shaped . . . produced proximally into a narrow, tubular portion, 

 which reaches the distal part of the orifice of the preceding zooecium in the same 

 longitudinal row. Outlines of zooecia hexagonal, pentagonal, or lozenge-shaped. 

 Horizontal cryptocyst not definitely marked off from the lateral walls which are 

 recumbent and usually overlap parts of the adjoining zooecia. Opesia greatly 

 reduced, hardly larger than the orifice, the distal margin semicircular, the convex 

 proximal border formed by a small median process, at the sides of which are a 

 pair of condyles, sometimes accompanied by a second pair of distally situated 

 teeth. Avicularia with undivided opesia, or with opesiules separated from it. 



As Harmer stated (1926, p. 335) the genus Cellaria is a difhcidt one. 

 Hastings (1946, pp. 233-239) cited the need for a revision and careful 

 reexamination of the species of the genus. Livingstone (1928, pp. 

 39, 42) created two new genera, Mawsonia and Pseudocellaria, out of 

 Cellaria. Mawsonia seems more justifiable as a separate genus than 

 Pseudocellaria. Brown (1952, p. 164), with some hesitation, includes 

 Pseudocellaria in the synonymy of Melicerita, a decision which appears 

 proper. It is rather difficult to find characters which sharply difl'er- 

 entiate Cellaria, Cellariaejorma, Mawsonia, and Melicerita from each 

 other. The shape of the aperture and the avicularia seem to be the 

 most usable features. 



The genus Cellaria, in the writer's opinion, should be revised to 

 exclude Mawsonia, Melicerita, and the new genus Cellariaejorma. 



Emended diagnosis: Zoaria free, erect, usually jointed and usually 

 branched. Branches cylindrical, generally dichotomous. Zooecia 

 arranged in series of rhombi or hexagons around the branch axis, 

 presenting a sculptured surface pattern of great beauty. Very regu- 

 lar areolation, which varies from rhomboidal to hexagonal. Orifice 

 (space closed by operculum) somewhat reniform in shape and wider 

 than long. A pair of condyles often present, one near each proximal 

 corner of the orifice. The avicularia are vicarious and in general 

 have a rather triangular mandible which in the majority of species 

 is longer than wide, sometimes considerably so. 



Cellaria moniliorata, new species 



Plates 5,F-I; 6,A-L 



Diagnosis: Colony erect, calcareous, fragile, articulated; composed 

 of slender cylindrical internodes which arise dichotomously at the 

 yellow chitiuous joints or nodes. Articulation nodate (see Busk, 1884, 

 pp. 85-86, and Hastings, 1946, p. 234). Transparent, punctae- 

 covered hexagonal zooecia arranged in series of four around branch. 



