478 THE AUSTRALIAN HYDR0MEDUS.E, 



distant on every second internode of the pinna, adnate through 

 half their length, tubular, with entire margin. The Hydranth is 

 divided into three different parts by two strictures. Yellow 

 gland-cells are scattered in the outer widest part, and are found in 

 a dense mass in the central extension of the gastral cavity. 

 Nematophores a pair of inferior on each Hydrotheca, one above 

 and behind the Hydrotheca, and one to each intermediate inter, 

 node. Gonophores unknown. 



I obtained this species in Pert Phillip, Victoria ; and Timaru, 

 New Zealand. 



In the young shoots, cells were observed similar to those 

 described by Jickeli, in Campanularia (1.) Plate XII., fig. 10. 



22. GENUS. ANTENNULARIA. Lamarck. 



Plumularidfo consisting of an anastomosing Hydrorhiza from 

 which stems arise which possess verticillate branchlets. Alimentary 

 Zooids in cup-shaped Hydrotheca?. Machopolypes in bithalamic 

 Nematophores to each Alimentary Zooid : one inferior pair and 

 two medial susperior ones between the Alimentary Zooids. 

 Polypostyles in Gonothecse which are axilliary and lateral. 



The Histology of Antennularia antennina was investigated by 

 Weismann (2), and this species, together with A. ramosa, served 

 Hamann (3) as material for his investigations. 



133. ANTENNULARIA CYLINDRICA. Bale. 



This species was found in Port Curtis and has been described by 



Bale (4.) 



134. ANTENNULARIA CYMODOCA. Busk. 



This species was found in Australian waters and has been 

 described by Busk (5.) 



(1.) C. F. Jickeli. Ueber den Bau der Hydroidpolypen. Morphologiscb.es 

 Jahrbuch Band VIII. Seite 632. 



(2) A. Weismann. Die Entstehung der Sexualzellen bei den Hydro- 

 medusen. Seite 188. 



(3) 0. Hamann. Der Organisums der Hydroidpolypen. Jenaische 

 Zeitschrift. Band XV. Seite 529, 530. 



(4.) W. Bale. Catalogue of the Australian Hydroid Zoophytes, p. 146. 

 (5.) T. Busk. Transactions of the British Association, 1S50. 



