BY E. VON LENDENFELD, PH.D. 477 



Pinnae are distant and irregularly alternate, one to each Internode. 

 The whole animal is bright brick red. The Hydrothecae are cup- 

 shaped and adnate throughout their entire length. The margin is 

 entire, slightly undulating, the whole cup slightly quadrangular 

 pyramidal. Every second Internode of the Pinna bears a Hydro- 

 theca. Nemotophores small and wide-mouthed, bithalamic. An 

 inferior pair in front of each Hydrotheca and two medial ones 

 behind each Hydrotheca. The anterior of these is similar to the 

 paired Nemotophores with a terminal opening lying in a plain 

 vertical to the axis of the Nematophore. The terminal opening of 

 the posterior one is oblique and looks forward. 



The Gonophores are borne along the stem on the Pinnae and 

 spring from the base of the Hydrotheca ; Male, oval, tapering 

 below • Female, slender, pear-shaped, with a jointed stalk bearing 

 two Nematophores near the base. 



I obtained this species from sea- weeds of the Laminarian Zone 

 in Port Jackson. 



131. PLUMULARIA TORRESIA. Nov. sp. 

 Plate XTII.,figs. 13, 14, plate XIV., fig. 16 

 The Polyp colony consists of a thick branching stem (polysy- 

 phonic) on the branches of which slightly pinnate or irregular 

 branchlets are found. The whole attains a height of 5 cm. The 

 Hydrothecae are cup-shaped, the margin is entire in its greater 

 part, and has one tooth with a concave incision below. The cup 

 is slightly elevated. The Nematophores are broad and stout, oval, 

 bithalamic, one pair below each Hydrotheca ; two medial ones 

 between the Hydrothecae. Male Gonophores very slender, oval ; 

 female, pear-shaped and stalked. This species was dredged by 

 the Hon. W. Macleay in Torres Straits. (Macleay Museum.) 



132, PLUMULARIA TRIPARTITA. Nov. sp. 



Plate XII., figs. 8, 9, 10. 



From a creeping Hydrorhiza pinnately branched, shoots arise 



which attain a height of 4 cm. The pinnae are alternate, and 



there is one pinna to each internode. The Hydrothecae are 



32 



