BY "WILLIAM A. HASWELL, M.A., B.SC. 351 



Idmonea radians, Bush, Catalogue of the Cyclostomatous Polyzoa 

 in the Collection of the British Museum, p. 11, pi. vii., figs. 1 — 4. 



" Zoarium usually procumbent, stipitate, sometimes suberect ; 

 branches dichotomous, radiating more or less regularly in a 

 circular form from the centre, very angular in front ; dorsal 

 surface perforated ; cells 1 — 4 in each series, the innermost the 

 longest, aperture (when quite perfect) bilabiate." (Busk.) 



This species is extremely common on the shore near Sydney, 

 both in Port. Jackson and on the outer coast. 



2. Idmonea milneana, D'Orbigny. 



Idmonea milneana, D' Orligny, Voy. Amer. Mend., Polypiers, 

 p. 20, pi. ik., figs. 17 — 21 ; Bush, I.e., p. 12, pi. xi. 



" Zoarium spreading, ramose, dichotomous, each longer branch 

 usually terminating in a pair of short forks ; tubes very slightly 

 exserted, flattened and even ; aperture wide, margin thick ; four 

 cells in each series. Surface finely dotted, slightly sulcate behind; 

 dorsal surface convex, usually marked with concentric lines of 

 growth." (Busk.) 



I have some hesitation about placing under this heading a 

 species of Idmonea very commonly dredged in Port Jackson. 

 It seems to approach very near the above named species in general 

 form and habit of growth ; but the oral margins of the cells in 

 place of being thick as described by Busk in D'Orbigny's species, 

 are extremely thin and delicate. The "dots" on the surface 

 consist not of impressed dots but of close set minute granules, 

 which are seen under a higher power to be of compressed ovate 

 form, each marked by a mesial longitudinal groove. The colour 

 is light purple. 



3. Idmonea Pedleyi, sp. nov. 



This species which seems to be undescribed, is a near ally of 

 the preceding. The branches are more slender, and the terminal 



