14 
from the outline of the individual cells. The distal transverse edge of each 
zooecium bears an opaque circular white spot, reminding one of a fractured 
avicularium fibre. 
Ohs. — This is the only representative of the Polyzoa known from the 
Cretaceous within the boundaries of N. S. Wales, and incrusts the interior 
of a bivalve, being exposed by the partial removal of the shell of the 
latter. After consulting my colleague, Mr. Thomas lYhitelegge, I have 
determined to provisionally refer it to Memhrardpora , but in so doing I would 
call attention to a form I have recently described as Lunulites ahnormalis} 
There is certainly a community of characters between the zooccia of the 
two, and although the polyzoaria of both are more or less circular, in the one 
case the colony is incrusting, of that tliere can be no doubt, and therefore follows 
the outline of the body to which it adheres, in the other the colony is cupuli- 
form, and presents every appearance of being free, at anyrate there is no sign 
of attachment, and the numerous individuals comprising a large hand-specimen 
are heaped upon and compressed against one another. Until I am in jiossession 
of further facts, I think it more advisable to separate the two forms. 
— Mount Wilson "Well, Dunlop Station, thirty miles Avest-north- 
west of Louth, Darling River, North-AYest N. S. Wales {S. Y. L. Brown). 
Hor. — LoAver Cretaceous. 
Colin. — Mining and Geological Yluseum, Sydney. 
PELECYPODA. 
SYNCYCLONEMA, Meek, 1864. 
(Smithsonian Miscel. Collections, 1864, XII, No. 177, p. 31.) 
Syncyclonema socialis, 3Ioore, sj). 
Becten socialis, Moore, Quart. Jonrn. Geol. Soc., 1870, XXVI, p. 248, t. 11, f. 9. 
Bccten psila. Ten. Woods, Proc. Linn. Soc. N.S. Wales, 1883, VIII, Pt. 2, p. 239. 
Becten socialis, Eth. fil., Geol. Pal. Q’land, &c., 1892, p. 446, t. 21, f. 6, 7, and 9. 
Becten, sp. ind., Eth. fil. Loc. dt., t. 21, f. 5. 
Becten wquilineatlis, Eth. fil. {n07i Moore), Loc. cit., t. 21, f. 8 {770)1 p. 445). 
Becten [Syncyclonema?) socialis, Eth. fil.. Bull. Geol. Survey Q’land, 1901, No. 13, p. 13. 
Ohs. — This remarkable little shell is only knoAvn to us as a N.S. Mhales 
fossil from the type specimen of the Rev. J. E. T. "Wood’s Becten psila, 
* Bull. Geol. Survey Q’land, 1901, No. 13, ]). 11, t. 4, f. 7 and 8. 
