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 2
BioStor
