30 



Suborder II. — Cyclostomata, Busk. 

 FAMILY CRISIID.E. 

 Crisia, Lamx. 

 C. acropora, Busk. St. Vincent's Gulf. 



FAMILY IDMONEID.E. 

 Idmonea, Lamx. 

 J. radians, Milne Edwards. 

 /. Milneana, d'Orbigny. 



Suborder III. — Ctenostomata, Busk. 

 FAMILY VESICULARIID/E. 

 Amatiiia, Lamx. 

 A. australis, Tenison Woods. 

 A. pvtmata, Kirkpatrick. 



A. distans, Busk. Of this I have examined two small speci- 

 mens, not very perfect, but still sufficient to show their identity 

 with the form described from off Bahia in the Challenger Polyzoa. 

 It is readily distinguislied from our other Australian species by 

 the series of zooecia describing a single — sometimes not quite 

 complete — spiral round the upper half of the internodes. 



Vesicularia, J. V. Thomson. 



V. bilateralis, n. sp. ; fig. 4. Zoarium cylindrical, confervoid, 

 branched, articulated, each internode giving origin to three 

 arranged in a verticillate manner. Zooecia disjDOsed in two 

 thickly clustered series on opposite sides of the branches, occu- 

 pying the whole length except for a short distance at the l^ase; 

 ovate, length 0*4 mm., diameter about 0*25 mm. 



The only specimen I have seen is probably a fragment of a 

 larger mass. 



EXPLANATION OF FIGURES. 



Figs. I and la. Menipea Porteri, front view, magnified. Fig. lb. Posterior 



view of same. 

 Fig. 2. Thairopora WhittcUi, natural size. Fig. 2a. Two young zooecia near 



the growing end, highly magnified. Fig. lb. Two series farther back, 



showing fully-formed zocecia. 

 Fig. 3. Adeonellopsis Zeitzii, two zooecia, magnified. Fig. 3a. Small portion 



magnified, showing zocecia and ocecial cell. 

 Fig. 4. Vesicularia bilateralis, natural size. 



