32 A MONOGRArn OF THE TERTIARY POLTZOA OF VICTORIA. 



Cajic Otway, ^Ir. Donnant. 



I liavc only a siiii^-lc specimon of this very interesting form. The thyrostome 

 (lilfers from that of tlie other species in its thin raised peristome. The ovarian pores 

 arc very large, when fully formed occupying the Avholc of the upper 2)art of the 

 zoa>eium l)et\veen tlic peristome and the cell margins. The avicularia arc somewhat 

 similar to those of the smaller C gracilis. 



Family FLUSTRiDiE. 



Zoariiim exi)an(led, llexihle, membrano-calcareous, erect, foliaceous, ligulate or 

 spirally twisted round an imaginary axis, uni- or hilaminate. Zooecia elongated, 

 separated hy raised margins; front entirely membranous, or partly filled in by a 

 thickened calcareous lamina, 



Craspedozoum, 3IcG. 



Zoarium erect, in ligutate divisions, uni- or bilaminate, each branch bordered 

 throughout its whole extent by a bundle of radical fibres springing from the bases 

 of the lateral zocecia. Zooecia quadrate, aperture ])artly filled in by a thickened 

 lamina. Ofjccia external. 



1. C. rohoratimi, Hincks, sp. PI. IV., fig 5. 



Memhramporu rohorota, Hincks, A. M.N. 11., Aug., 1881 ; Waters, Q.J.G.S., 

 1883, p. IS^; Crasi^edozonm roboratnm and liyiilahim, McG., P.Z.V., 177; Fliistra 

 membraniporides. Busk, C.P., Pt. I. ; p. 54. 



Zooecia largely open in frcmt, the aj)erture partly filKnl in below by a narrow 

 granular lamina ; a spine at each upper angle ; one or two sessile auricularia on 

 romided eminences below the aperture. In recent sj^ecimcns the ooecia somewhat 

 miti'iform, tlu> upper rim thickened, and a depressed area inferiorly. 



Al.C. ; W.P. (A\'.) Living. Australia and New Zealand. 



In I'.Z.V., to which I refer for full descriptions and figures, I described three 

 species. Of tlu^se, Jiowever, C. rohoratum and C. lUjulalum differ chiefly in the 

 former being bilaminate, the latter being unilaminate and narrower. These 

 differences are scarcely of specific value, and I, therefore, now unite the two forms. 

 The fossils Avhich I have seen are unilaminate. 



Hincks referred this .specie's, but somewhat doubtfully, to Mcrabranipora ; and 

 Waters (A M.N.H., Sept., 1887) agrees Avith him, uniting also all my three species 

 in one. C. sjncatum, however, is totally distinct in essential specific characters. 



