Tertiary Polyzoa of Victoria. 11 



The thyrostome is imperfect but the deep narrow furrows on 

 the dorsal surface are very distinctive and separate it from the 

 last described species. 



Catenaria tenuis, n. sp. (PL II., Fig. 22). 



Zooecium tubular below, ventricose and ovate above. Thyros- 

 tome suborbicular. Front of zooecium oval, raised ; upper part 

 divided radially into four triangular areas ; two lateral and two 

 distal ; the lower part with a narrow, irregularly curved, raised 

 band or fillet. An avicularium on a bi'oad, blunt, retrocedent 

 rostrum at each upper angle. Socket for connecting tube, or 

 base, of distal zooecium on the side. 



Locality. — Muddy Creek. (T. S. Hall). A single specimen. 



It is much smaller but is very similar in form to C. bicornis, 

 Busk (Challenger Polyzoa, p. 14, pi. iii., fig. 2). The orna- 

 mentation of the surface of the raised oval area is not very 

 well preserved and rather difficult to make out, but it is quite 

 different from that of C. bicornis. The genus has not been 

 hitherto recorded as fossil. 



Catenariopsis, nov. gen. 



Zooecia pyriform, ventricose. Thyrostome suborbicular; below 

 which is a serai-circular opening at the upper part of which is a 

 flat descending plate, with a curved slender process at each end, 

 pointing downwards into the cavity of the zooecia and towards 

 the sides ; below this is a crescentic area, finely punctate. A 

 perforation (avicularian 1) on each side above the thyrostome. 

 Zooecia tapering downwards into a peduncle. 



Catenariopsis morningtoniensis, n. sp. (PI. II., Fig. 23). 



Characters as for genus. 



Z<?(;a///j/.— Mornington. (T. S. Hall). 



This a most puzzling specimen. It is very like a CateJiaria 

 in form (hence the name) but the two openings are very peculiar. 

 I have described the upper one as the thyrostome as the lower 

 one may be the analogue of the structure of that part of the 

 zooecia immediately below the thyrostome in Steganoporella and 

 Thalamoporella, as the spinous process, on one side, seems to 



