ox CHILOSTOMATOUS BRYOZOA FEOM ALDINGA, ETC., S. AUSTRALIA. 279 



28. Chilostomatoijs Bryozoa /rom Aldinga and tlie River-Mtjrray 

 Cliffs, South Australia. By Arthur Wm. Waters, Esq., 

 P.G.S. (Read February 25, 1885.) 



[Plate VII.] 



The fossils described in the present paper were collected by Professor 

 Ralph Tate, who kindly sent them over to me for description. 

 With a few exceptions, they are from Aldinga, or the " River- 

 Mnrray Cliffs." A few small and imperfectly preserved specimens are 

 from a bore-hole in Adelaide, representing a find which seems to 

 have considerable geological interest. They are evidently from a 

 clay matrix, and belong to species common in the clay of Curdles 

 Creek. The collection furnished various Cyclostomata, which have 

 already been dealt with in a former paper (Quart. Journ. Geol. Soc. 

 vol. xl. p. 674). 



As a considerable number of Australian fossil Chilostomata have 

 already been described, we naturally find many old friends ; but 

 there are also several new forms of extreme interest, especially as 

 bearing upon the question of the various modes of growth of the 

 Chilostomata. The previous collections have furnished a large 

 number of instances of a species growing in both Eschara- and 

 Lepralia-f orms, and we again find new examples of this, among which 

 Memhranipora rJiynchota, Busk, in the Eschara stage, is especially 

 interesting ; and there are examples of already-known Smittice and 

 Monoporellce occurring in a reticulate form ; but this time the chief 

 interest is in a number of specimens which grow in a cupulate 

 manner, which we might either call Cupularia- or Lunulites-form, 

 and for convenience we will adopt the latter. There is Lepralia 

 edacc in this form ; a Microporella for which the name pocilliformis 

 is proposed ; and, further, a second MicroporeUa^ which was named 

 by Mr. Tenison- Woods Lunulites magna ; also Memhranipora aperta, 

 Busk, in this form. We are already acquainted with Ouniidipora 

 transilvanica, Rss., which is a Microporella growing in a solid form. 

 Sticliopora clypeata^ Hag., and Imnidites Ooldfussi, Hag., are both 

 Membraniporidae ; Cellepora crustidenta, Hag., has zooecia similar to 

 those of Selenaria macidata, Busk ; Lunulites incisa, Hincks ( Gones- 

 charellina conica, Haswell)* is a species of the Schizoporellidae ; Cel- 

 lepora tridenticidata, Busk, found by the ' Challenger ' expedition in 

 the lamellar condition, is represented by several fossil specimens, 

 some of them in the most regular Liaiidites-iorm. Another Celle- 

 pora also occurs in this shape. 



The genus Cellepora is, even when well-preserved recent specimens 

 are available, a most difficult one to deal with, and with fossils where 

 the terminal portion of the cell is often only imperfectly preserved 

 the difficulty is immensely increased ; but after repeatedly returning 

 to this genus the results obtained are interesting. In a paper ^' On 



* These two names were published in the same year, and I am unable to find 

 out at present which has precedence. 



