Aht. it. — Further Descriptions of the Tertiary Pol 

 of Victoria.— Part VIII. 



By C. M. MAPLESTONE. 



(With Plates I. and II.). 

 [Bead 3rd April, ]9()2.] 



Catenariopsis mopningtoniensis, Map. (PI. I., Fig. 1). 



This species I described in Part II. of these papers (P.R.S.V., 

 vol. xii., pt. 1, p. 11), from a specimen of a single free zooecium 

 from Mornington, and I stated tliere was nothing to show the " 

 character of the zoarial growth but that it was probable it might 

 originate from a creeping stolon like -iEtea. I have found a 

 fragment of a univalve shell from the Gellibrand River deposit 

 with several groups of zooecia upon it, they are adherent like 

 those of Hippothoa ; the zooecia are in single series ; they do not 

 grow from the median line, but from one side, near the distal 

 end. In only one of the zooecia is the thyrostome perfectly 

 preserved ; it shows, as I supposed, a structure of a similar 

 character to that of Steganoporella ; the " descending plate " 

 mentioned in the description divides the zooecial cavity into two 

 chambers in a somewhat similar manner to the " cryptocyst " of 

 that genus, leaving an " opesiule " on each side. A figure is 

 given showing the zooecium with the perfectly preserved thyros- 

 tome and the proximal part of one growing out from it. The 

 zooecium is misshapen and unsymmetrical, owing to the presence 

 of some cells of an encrusting zoarium of an indefinable species 

 interfei'ino; with it. 



Smittia macgillivrayi, nov. nom. S. transversa, McG. 



Dr. MacGillivray, in his Monograph of the Tertiary Polyzoa of 

 Victoria (T.R.S.V., vol. iv., p. 92) describes a species of Smittia 

 as S. transversa, having apparently overlooked the fact that 



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