HiLGENDORF. — CnJiiptohlast Hydro'ulii from KcriiKtdcr hlaiidx. 541 



Two species of this genus have been found in New Zealand, but neither 

 here nor in Australia does the genus seem common. Bale (Cat. Aus. Hyd. 

 Zoophytes, p. 65) says he has a specimen that he thinks is //. tcnellum, and 

 V. Lendenfeld (Proc. Linn. 8oc. N.S.W., ser. 1, vol. 9, p. 405) found speci- 

 mens at Port Phillip that he was inclined to refer to this species. My speci- 

 mens were not quite typiciil, having a great tendency to produce only two 

 cups. 



Sertularia minima (Thompson). 



(For svnonyms and references, see Farquhar, Trans. N.Z. Inst., vol. 28, 

 p. '462 ; also Hilgendorf, Trans. N.Z. Inst., vol. 30, p. 209.) 



Hob. — Timaru and Dunedin, in New Zealand ; Australia ; Cape of Good 

 Hope ; Kermadec Islands (on seaweeds cast up on Denham Bay beach, 

 Sunday Island). 



Synthecium elegans (Allman). 



(For synonyms and references, see Farquhar, Trans. N.Z. Inst., vol. 28, 

 p. 465 ; also Hilgendorf, Trans. N.Z. Inst., vol. 30, p. 211.) 



Hah. — Bluff, Stewart Island, and Dunedin Harbour (New Zealand) ; 

 Kermadec Islands (Denham Bay, Sunday Island). 



The specimens were growing on the base of an Aglaophenia, to be men- 

 tioned below. 



The interthecal spaces were longer than in previous specimens I have 

 seen, being as long as the thecae measured along the outer curve. 



Plumularia setacea (Hincks). 



(For synonyms and references, see Farquhar, Trans. N.Z. Inst., 

 vol." 28, p. 466 ; also Hilgendorf, Trans. N.Z. Inst., vol. 30, 

 p. 214.) 

 Hab. — Timaru and Dunedin (New Zealand) ; Australia ; Europe ; 

 Kermadec Islands (Denham Bay, Sunday Island). 



This is a very delicate form of the species, and only about ^ in. high. 



Aglaophenia laxa Allman. Figs. 1, 2, 3. 



A. laxa Allman, 1876, Journ. Linn. Soc. (Zool.), vol. 12, p. 275. 



Hab. — New Zealand; Kermadec Islands (Denham Bay, Sunday Island). 



This species seems never to have been seen since Allman found it thirty- 

 four years ago in a collection brought home from New Zealand by Mr. Busk. 

 Allman placed the specimen only provisionally in this genus, owing to his 

 not having seen the corbulae. My specimen showed these structures, and 

 a description is attached. 



The whole specimen was creeping over a piece of sponge about 1 in. 

 long and ^ in. wide. It is light brown in colour, and 1 J in. in height. The 

 hydrocaulus is simple and sparingly branched, the sketch in fig. 2 show- 

 ing the most elaborately branched hydrocaulus found. The corbulae 

 are about as long as one of the pinnae springing from the hydrocaulus. 

 Each corbula consists of a rachis, from which spring about 18 costae, those 

 on one side of the rachis alternating with those on the other. The rachis 

 is jointed for every costa. The costae are narrow, so that the corbula is an 

 open basket closed only by the overfolding of the lateral projections from 



