II. FAMILY CELLARIIDAE 



Plates 3-11 



The present study deals with the ectoproct Bryozoa of the order 

 Gymnolaemata, suborder Cheilostomata, family Cellariidae that were 

 collected by the Antarctic expedition. 



The collection includes more than 100 ectoproct species, but only 

 10, belonging to the family Cellariidae, are discussed in this paper. 

 The other species are reserved for succeeding papers. 



Of the 10 cellariid species treated here, 7 are new. A new genus is 

 created to receive three of these new species. One genus is redefined. 



The measurements included in the taxonomic discussions are based 

 on 10 readings unless otherwise specified. 



Taxonomic Discussion 



The family Cellariidae was erected by Thomas Hincks (1880, p. 103) 

 to include those Cheilostomata having zooecia that are "usually 

 rhomboidal or hexagonal, disposed in series round an imaginary axis, 

 so as to form cylindrical shoots. Zoarium erect, calcareous, dichoto- 

 mously branched." Hincks also noted the jointed condition of the 

 colonies but doubted whether that character was sufficiently important 

 to include in the diagnosis of the family. Canu and Bassler (1917, 

 pp. 32-33) gave the following definition of the family Cellariidae based 

 on the revisions and additional work of authors since Hincks. 



The whole frontal wall of the zooecia is a cryptocyst and they have a well 

 chitinized, bilaniinar, simple operculum with a straight or concave proximal 

 margin. Within the proximal and sometimes also within the distal margin of 

 the aperture is placed a pair of (or sometimes a single broad) supporting teeth. 

 The subopercular area of the avicularia has an unusuallj' strongly developed, 

 sometimes almost complete cryptocyst. The ovicells are endotoichal. (After 

 Levinsen, 1909.) 



The expedition yielded ten species of Cellariidae, of which seven 

 are new. These ten species are as follows: 



Cellaria moniliorata, new species 

 Cellaria vitrimuralis, new species 

 Cellaria wandeli Calvet, 1909 

 Cellariaeforma coronata, new genus, new species 

 Cellariaeforma extentamuralis, new species 

 Cellariaeforma parvimuralis, new species 

 Mawsonia extensalata, new species 

 Mawsonia membranacea (ThorneljO. 1924 

 Melicerita latilaminata, new species 

 Melicerila obliqua (Thornely), 1924 



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