378 Reports and Proceedings — 



with a mucTi compressed, obliquely cut, longitudinal section of the 

 shell itself, which can be removed from its mould. On the posterior 

 part of the fossil the course of the sutures of the septa can be fairly 

 well seen : after passing upwards for a short distance, the sutures 

 bend forward, and, meeting those from the opposite side, which 

 are similarly bent, form a band of superposed chevrons, situated 

 mesially in this part of the fossil. When the shell is removed from 

 its mould, the chevron band appears to be distorted, and is then 

 continued forward as a narrow, partly disconnected groove, to the 

 anterior margin of the fossil. There is a ridge on the shell itself 

 corresponding to this groove, which the author considers to be the 

 siphuncle. 



On the anterior part of the fossil coarse corrugations are present 

 which correspond to the lines of growth of the shell. The body- 

 chamber is not preserved. 



Only 5 species of Conoceras have as yet been described ; the author 

 compared the Llanvirn species with these, and also with a fossil from 

 the Devonian of Nassau, which Kayser referred to GorapTioceras, but 

 which possesses several characters in common with Conoceras. 



The horizon from which this new species was obtained was that of 

 the Llanvirn Beds, some typical Llanvirn fossils having been found 

 with it. The author named the species Conoceras Llanvirnensis. 



6. " Fossil Cyclostomatous Bryozoa from Australia." By A. W. 

 Waters, Esq., F.G.S. 



In the };)resent paper the Cyclostomata from Curdles Creek, Mount 

 Gambler, Bairnsdale, Muddy Creek, etc., Aldinga and Eiver-Murray 

 Cliffs were described, bringing the total number of fossil Bryozoa 

 from Australia, dealt with in this series of papers, up to 195, of 

 which 85 are known living. Of the 32 Clyclostomata now dealt 

 with, 12 at least are known living, and one cannot be distinguished 

 from a Palseozoic form ; 9 are apparently identical with European 

 Cretaceous fossils. 



Although so many remind us of European Chalk and Miocene 

 species, great stress was laid upon the imperfect data available for 

 sucli comparisons, the Cyclostomata furnishing but few characters 

 which are available for classification, which, so far, has almost 

 entirely been based upon the mode of growth, which, in the Chilo- 

 stomata, has been shown to be of secondary value. In consequence 

 of the few available characters the Cyclostomata do not seem likely 

 to be ever as useful palseontologically as the Chilostomata, and as 

 they are less highly differentiated, it is not surprising to find that 

 they are more persistent through various periods. 



In order to see how far other characters might be available, the 

 author has examined Cyclostomata, both recent and fossil, from 

 many localities and strata, and pointed out that the size of the 

 zooecia should always be noticed, as also the position of the closure 

 of this tube. The arrangement of the interzooecial pores may fre- 

 quently give great assistance, and these are considered the equiva- 

 lents of the rosette-plates ; but the most useful character of all is no 

 doubt the ovicell, which varies specifically in position and structure ; 



