BY R. VON LENDENFELD, PH.D. 405 



Weismann (I) studied two representatives of this genus. 



Hamann (2) published a short note on the embryology of this 

 genus. The ciliated embryo, with an Entoderm and an Ectoderm, 

 was observed. The Entoderm is produced by a kind of invagi- 

 nation, but not by delamination as in other cases, and the process 

 is somewhat similar to that described by Ciamician (3) from 

 Tubularia. 



HALECIUM TENELLUM. Hincks. 



Bale (4) has found a specimen very similar to this European 

 species, and I am also inclined to refer some specimens which 

 I obtained in Port Phillip to this species. 



IV. SUB-FAMILY SERTULARINvE. Von Lendenfeld, 18S4. 



Alimentai-y zooids sessile their thecpe inserted in the free and 

 erect or creeping stem. 



1. GENUS. LINEOLAKLA. Hincks. 



This Genus is intermediate between this and the former Sub- 

 Family. The Hydrophyton is closely attached to foreign bodies. 

 The Hydro thecse are sessile. 



LINEOLARIA SPINULOSA. Hincks. 



This Hydroid is common on Cymodocea Antarctica in Port 

 Phillip and Portland. 



LINEOLARIA FLEXUOSA. Bale ? 



Bale (5) describes a Lineolaria the Gonophoi'es of which are 

 unknown, from Williamstown under this name. 



(1.) A. Weismann. Die Entstehung der Geschlechstszellen bei den 

 Hydromedusen. Seite 160-l(i5. 



(2.) Hamann. Der Organismus der Hydroidpolypen. Jenaische Zeit- 

 schrift. Band XV., .Seite 528. 



(3. J Ciamician. Ueber den inneren Bau und die Entwickelung von 

 Tubularia, Zeitschrift fur wiss. Zool. Band XXXII. 



(4.) Bale. Catalogue of the Australian Hydroid Zoophytes, p. 65. 



(5.) Bale. Catalogue of the Australian Hydroid Zoophytes, p. 62. 



