194 Mr. A. W. Waters on Australian Bryozoa. 



55. Lepralia elimata, sp. nov. 

 (PI. V. fig. 3 ; PL VI. fig. 22.) 



Zoarium incrusting. Zooecia indistinct, or divided hj a deep 

 depression, surface smooth, porcellaneous, frequently a large 

 raised avicularium below the aperture directed forwards, closed 

 by a large round mandible. The oral aperture is coarctate, 

 with a denticle on each side forming the contraction. Opercula 

 0*13 millim. wide. The ovicell is smooth, plain, subim- 

 mersed, widely open in front. This in many respects much 

 resembles L. hipj^opus, but has only the central suboral avi- 

 cularium and no lateral ones. 



The well-marked thickened lateral bands on the sides of 

 the opercula seem to be the rule in true Lepralia^ and it may 

 be found to be a character of generic value. It occurs in L. 

 adpressa^ L. Pallasiana, L. Poissonii^ L. rectilineata, L. stria- 

 tula, &c., and may be seen in my figure of the operculum of 

 L. rectilineata (Quart. Journ. Geol. Soc. vol. xliii. pi. viii. 

 fig. 34). 



Loc. Sow-and-Pigs Reef, Port Jackson, 3-4 fath. 



56. Lepralia vestita, Hincks. (PI. VI. fig. 21.) 



Lepralia vestita, Hincks, Ann. & Mag. Nat. Hist. ser. 5, vol. xv. p. 256, 

 pi. ix. fig. 9. 



Specimens from Port Jackson have somewhat larger zooecia 

 than those from Tahiti, the oral aperture is also a trifle larger, 

 and there are no avicularia. The upper part of the thick 

 peristome is raised ; the large prominent ovicell is usually 

 thickened at the two sides, where it joins the peristome, form- 

 ing a kind of raised ridge, and the centre is sometimes um- 

 bonated. The operculum has two thick lateral bands, and in 

 the oral aperture there is a denticular contraction at each 

 side. 



Loc. Tahiti ; Fiji Island ; Sow-and-Pigs Reef^ Port Jack- 

 son, 3-4 fath. (dredged by Brazier). 



57. Mucronella LLllerii, MacGr., var. hiaviculata, nov. 

 (PL V. fig. 9.) 



Type Lepralia Ellerii, MacG. Trans. Roy. Soc, Vict. vol. ix. 1868^ 

 p. 135 J Zool. Victoria, dec. iv. p. 31, pi. xxxvii. fig. 8, 



A specimen from Green Point, growing on Idmonea Mil- 

 neana, has the rostrum much prolonged with a triangular 

 avicularium on one side, and often on the prolongation of the 

 rostrum a small semicircular avicularium. There are six 

 spines above the aperture, the finely granulated ovicell is 



