298 A. W. WATEES ON CKTLOSTOMATOUS BRYOZOA FROM 



here radiate in uniserial rows from the centre, with the greatest 

 regularity, whereas on the upper sul'ace numerous colonies are seen 

 to start from various points of the surface. The under surface is 

 divided bj radiating and bifurcating sulci, and the part between 

 these is raised, and along the ridges there are elevations looking 

 like points of attachment. In this respect the dorsal surface 

 resembles that of Selenaria maculata. Zooecia very little raised, 

 irregularly hexagonal, separated by distinct raised borders with large 

 pores round the edge of the zooecium ; small avicularia below the 

 aperture, with the opening rounded or slightly acute, directed down- 

 wards. Oral aperture with the proximal edge nearly straight, the 

 distal edge rounded, formed of more than half a circle, with two 

 contractions inside the aperture near the middle ; at widest part 

 about 0'12 mm. wide. Ovicell raised, globular. 



I have already pointed out that the aperture in recent specimens 

 is larger than in that from the Crag, and both the specimen from Mt. 

 Gambier and this one from ^Murray Cliff correspond in this respect 

 with those from Florida. In the Australian fossils no zooecial 

 avicularia (onychocellaria) have been found. Some ovicells show 

 an indistinct area on the front ; but this is not distinguishable on all, 

 and the ovicell is more globular than figured by Mr. Hincks. 



Mr. Busk* refers to finding " the backs of the polyzoan cells usually 

 disposed in parallel rows, much as they are on the concave surface 

 of some Lunulites," and Smitt seems to have noticed the same thing; 

 it is therefore interesting to find it now in a true Lunidites-form. 



38. Lepralia depressa. Busk, var. 



Leprcdia depressa^ Busk, var. — Waters, Quart. Journ. Geol. Soe. 

 vol. xxxviii. p. 509. 



In a specimen of this variety from Aldinga there are small, globular, 

 raised, granulated ovicells. 



39. Lepralia rostri&era, Smitt. 



EscJiarella rostrigera, Smitt, Ploridan Bryozoa, p. 57, pi. x. 

 figs. 203-205. 



A specimen from the River-Murray Cliffs is growing in the 

 Lepralia-stage. The hexagonal zooecia are very little raised and 

 the surface is covered with large pores. The aperture is nearly 

 round, with two lateral contractions ; width 0*14 millim. There is 

 usually a smaU avicularium pointed upwards on one side of the 

 aperture, but seldom on both sides. 



Loc. Florida, 35-43 fathoms. 



40. Lepralia escharella, Eomer (in Yincularia-form). 

 Vincidaria escharella, F. A. Eomer, " Die Polyparien des Nord- 



deutschen Tert. Geb." Paleontographica, vol. ix. p. 6, pi. i. fig. 1. 



This is evidently allied to L. hurlingtoniensis, but the hexagonal 

 zooecia are much larger, and the whole surface is covered with large 

 pores. The oval oral aperture is larger, measuring about 0-3 miUim. 

 across. 



Loc. Oligocene of Lattdorf (Eomer), Aldinga. 

 * Crag Polyzoa, p. 59. 



I 



