72 Descriptions of New, or Little Known, Polyzoa. 



F. pygoncea, n. sp. Plate III., fig. 1. 



This exquisite little species forms single tufts about l-12tli 

 of an inch high, like miniature bouquets, growing on the 

 cells of catenicellge. The stem is composed of highly polished 

 tubes, close together below, but distinct, and separated 

 by rows of cancelli above. The zooecia are, on the edges of 

 the capitulum, arranged in converging rows separated by 

 cancelli; the peristome is produced, and usually dimidiate, or 

 extended only on one side ; towards the centre of the head 

 the peristome is wanting or represented by a small spinous 

 process, and the cancelli are only distinguished by their 

 smaller size. 



Port Phillip Heads, Mr. J. B. Wilson. 



EXPLANATION OF FIGURES. 



Plate I. 



Fig. 1. Catenicella gemella. 

 Fig. 2. Claviporella pulchrci. 



Fig. 3. G. imperforata, showing two sorts of ooecia. 

 Fig. 4. C. aurita, specimen with only single central foramen. 

 Fig. 5. C. aurita, showing enormously developed lateral 

 processes. 



Plate II. 



Fig. 1. Thairopora Jervoisii. 



Fig. 2. Amphiblestrum hursarium. 



Fig. 3. Smittia calceolus. 



Fig. 4. Cribrilina acanthoceros. 



Fig. 5. Schizoporella Woosteri. 



Fig. 6. Porella formosa. 



Plate III. 



Fig. 1. Flosculipora pygmoea. 



Fig. 2. Lichenopora hullata, natural size. Fig. 2a, portion 



of same, showing a broken ooecium, magnified. Fig. 2b 



and 2c, other zooecia from the same. 

 Fig. 3. Lichenopora magnificco, small portion natural size. 



Fig. 3a, part of same magnified, showing portions of 



two radiating ridges and intervening surface. 



