OF NEW SOUTH WALES. 21 that Encalypfns seed had frequently loeen sold under fictitious names, the seeds of common and inferior kinds having been substituted for the more valuable descriptions. Mr. Brazier exhibited a collection of sternums of Fowls dis-playing the effect of different kinds of perches in modifying the shape and curvature of the ridge. Mr. Brazier showed that where the fowls roosted on a round perch the breast bone was normal ; but those that roosted on flat battens had the breast bone distorted. Mr. Masters exhibited a Majaqueus Tarkinsoni or New Zealand Petrel shot near Sydney Heads, and remarked that it was the first recorded instance of this bird visiting the Australian Coast. MONDAY, MAY 27th, 1878. W. J. Stephens, Esq., President, in the Chair, MEMBERS ELECTED. Charles Jenkins, Esq., L.S., Yass, and T. Tenison-Woods, Esq., Sydney. donations. From La Societe Entomologique de Belgique : Compte Rendu, Series II., No. 49. PAPERS READ. ON THE GEOLOGY OF YASS PLAINS. By Charles Jenkins, Esq., L.S., Yass. Flate VL In offering an account of some years' labor in the fossiliferous strata around Yass, I must apologize for not giving at present all the detail that may be desired. I find it impossible to accompany this paper with the necessary plans and sections, the result of surveys I have made, without which minute description would be unsatisfactory. I hope, however, in a future paper to supply the information I am now compelled to omit, accompanied by draw-ings of as many of the principal fossils as possible.