Mr. A. W. Waters on Australian By^yozoa. 195 



narrower tlian in typical M. EUerii, and there are no spinous 

 processes. Oral aperture 0'25 millira. 



In the shape of the avicularian mandible this most nearly 

 approaches M. vultur, Hincks (see Zool. Vict. dec. xii. p. Qb^ 

 pi. cxvi. figs. 5-8) , but this I should only consider a variety. 

 M. porosa, Hincks, also seems only to be another variety, and 

 occurs from Port Western, Victoria, with the small rounded 

 avicularium on the margin at one side of the mucro, entirely 

 corresponding with Mr. Hincks's figure. 



I have also described (Quart. Journ. Geol. Soc. vol. xxxviii. 

 p. 512) a fossil from Curdles Creek, in which there are spinous 

 processes, as in M. EUerii^ with an avicularian chamber at the 

 top, and such spinous processes seem to be readily transformed 

 into avicularia. 



We thus seem to have four varieties : — 

 Mucronella EUerii^ MacGr., typica^ from Williamstown and 

 Warrnamboul, Victoria {MacG>) ; Port Phillip, Vict. 

 {A. W. W.) ; Tasmania {A. W. W.). 

 Var. porosa, H., Curtis Island (H.) ; Port Western {A. 



W. TT.). (PI. VI. figs. 12, 17.) 

 Var. vultur, H., Port Phillip Heads, Portland, and Warrn- 

 amboul. 

 Var. hiaviculata, Waters, Green Point, Port Jackson, 

 8 fath. 



58. Smittia Landshorovu, Johnst., form per sonata, H. 

 (PL VI. fig. 23.) 

 Smittia Landsborovii, Johnst. form ^jersonata, Hincks, Ann. & Mag. 



Nat. Hist, ser. 5, vol. xiv. p. 283, pi. ix. fig. 3. 

 Smittia Landsborovii, Johnst., var. purpurea, Hincks, ibid. vol. viii. 



p. 64. 

 Smittia Jacohensis, Busk, Rep. ' Challenger,' Polyzoa, p. 153, pi. xix. 



Some large specimens growing over Mesenteripora repens, 

 Haswell, are deep purple, and in some parts of the colony 

 the arching over of the peristome is frequent, but in others is 

 not seen. Sometimes enormous spathulate avicularia cover 

 the whole of the zooecium. The immersed ovicell has an oval 

 perforated area, 



Loc. Living : Bass's Straits {H.) ; Port Phillip Heads 

 {H.) ; Porto Praya, Cape Verd Islands, 100-200 fath. ; 

 Marion Island 50-75 fath. {B.) ; N. of Watson's Bay, Port 

 Jackson, under stones. 



59. Ehynchopora crenulata, sp. nov. 

 (PI. V. figs. 7, 8.) 



Zoarium incrusting. Zooecia ovate, depressed below, sur- 



