Zoo/oyi/.] NATURAL HISTORY OF VICTORIA. \_Puiyzoii. 



Port Phillip Heads ; Portland, Mr. Maplestone ; Wan*nambool, 

 Mr. Watts. 



In many of the younger zooecia the oral avicvilaria are not 

 developed. The extreme marginal zooecia, l^efore the formation of 

 the uncinate processes, are smooth, those behind are granular. 

 Tu the fully formed zooecia the surface is glistening and granular. 

 The mouth is irregularly quadrate, the elevation on the upper side 

 of which the avicularium is situated is sometimes scarcely apparent, 

 at other times, as in the figure, it is of considerable size. It may 

 rise into a mucro, in some specimens becoming developed to such 

 an extent as to obscure every other part. The peristome may 

 have one or more small pointed processes. The zooecial avicularia 

 are usually as figured, but occasionally they are extremely narrow, 

 or may be as small as in R. bispinosa. 



The form which I described as H. profunda, I now believe to 

 be a mere variety of the present, in which the calcareous matter 

 is so much developed that the mouth, with the large uncinate 

 process, hes very deep, and the surface is vexy roughly granular 

 or nodular. 



Explanation of Figdees. 



Plate 196. — Fig. 11, portion of a fully developed specimen. Fig. 12, two marginal zocEcia 

 from another specimen. Fig. 13, young zooecia from var.yrq/irada, Fig. 13a, and 136, portion 

 of same specimen, showing fully formed zooecia. Fig. 14, portion of specimen with excessive 

 growth of mucros. 



Mr. MacGillivray has furnished the specimens and descriptions 

 for this plate. 



Frederick McCot. 



[357] 



