356 



W. M. Bale 



Billard lias first made known one such (C. sihogat). Probably^ 

 therefore, many observers will prefer to regard Cladocarpella as 

 at most a sub-genus. 



Out of fourteen species of Cladocarpus included by Nutting 

 anxQng the American Plumulariidae, twelve have the characteristic 

 gonosome as described above; in the other two it is unknown. A. 

 later species described by AUman — C. pectbiiferus — has also the 

 typical gonosome. In Cladocarpella a single hydrocladium may 

 give origin to several phylactocarps consisting of distinct inter- 

 nodes, of which from one to three bear gonangia, while the re- 

 mainder support only sarcothecae. 



Cladocarpella multiseptata Bale. 



Cladocarpella multiseptata. Bale, '' Endeavour " Kept.,. 

 Part iii., 1915, p. 304, pi. xlvii., figs. 1-5. 



In the original description I have indicated the distinctions 

 between this species and Cladocarpus (?) bat hy zona tits, Ritchie, a 

 closely allied form; and the Cladocarpus sihogae of Billard's- 

 '* Siboga " Report is equally nearly related to the present species^ 

 In C. sihogae the hydrothecae seem in lateral view more gradually 

 enlarged towards the aperture, and a more noticeable difference- 

 is in the septal ridges, which in C. sibogae number two to five, 

 while in C . multisej^tata there are about nine to fourteen. Billard 

 says that thesei ridges are found only in certain internodes, and 

 according to liis figures these may be the most recently formed ones;, 

 but in C. imdtisejytata their presence or absence seems to be a 

 matter of age, the proximal internodes having them, Avhile those 

 nearer the ends of the hydrocladia show^ no trace of them. 



C . sibogae is said to have two to four sarcothecae! between tw^o- 

 hydrocladia, in C . multise2)tata there are usually nine to twelve. 



Cladocarpus multiapertus, Billard (*' Siboga " Report) is suffi- 

 ciently distinguished from these species by the sarcothecae, which- 

 are mostly provided with two orifices in addition to the lateral one^ 

 Its gonosome has not been observed. 



Hydra, sp. 



The brown hydra commonly found about Melbourne has been' 

 hitherto generally referred to //. oligactis, the only species which, 

 according to Hi neks, agrees with it in regard to the so-called 

 " stalked " condition. Later researches, how^ever, especially b}'' 



