A NEW SPECIES OF PEDICELLINA FBOM 

 SYDNEY HAIIBOIIK. 



By T. H. Johnston, M.A., D.Sc, and Mavis J. Walker, 



B.Sc, 



Biologj^ Department, The University of Queensland. 

 (With One Text Figure). 



{Bead before the Royal Society of Queenskind, 25th June, 



1917). 



The only species of the endoproct Polyzoon genus 

 Pedicellina recorded from Austraha, as far as we are aware, 

 is P. cernua, the identification having been made by 

 Whitelegge (1889, p. 293), who collected liis material 

 under stones in Sydney Harbour. About twelve years 

 ago, one of us obtained specimens in similar situations 

 between tide marks at Middle Harbour and Watson's Bay, 

 Port Jackson. An examination of the material has led 

 us to regard the Sydney Pedicellina as belonging not to 

 P. cernua but to a closely-related new species, P. whiteleggii, 

 named in honour of Mr. Thomas Whitelegge, who did so 

 much to further the study of the invertebrate fauna of 

 New South Wales. 



The new sj^ecies resembles the European one in its 

 general habit and structure. From the creeping stolon, 

 devoid of spines, there are given off stems well provided 

 with spines throughout their length, these stems terminating 

 in calyces in various stages of development or regeneration. 

 The spines are much shorter than those of P. cernua. In 

 the latter, the distal portion of the stem is generally more 

 or less devoid of spines, a point of difference between it 

 and the Australian species. 



