Tertiary Polyzoa of Victoria. 9 



Catenicella dennanti, n. sp. (PI. II., Fig. 17). 



Zocecia quadrate, ventricose. Fenestrse 9 • 1 1 , large, py rif orm, 

 with raised max'gins. Thyrostome lofty, arched above, nearly 

 straight below. Lateral processes small. Large prominent, 

 auricular, avicularia at upper angles. 



Locality. — Bairnsdale. (J. Dennant). A single geminate 

 pair. 



Catenicella hluica, n. sp. (PL II., Fig. 18). 



Zooecium ovoid, flat in front. Fenestra; indistinct, probably 7. 

 Thyrostome arched above, sinuous below, prominent. Lateral 

 processes very wide, projecting forwards with a very large 

 imperfectly developed avicularium on each side. 



Locality.— W\xM^ Creek. (T. S. Hall), 



The large imperfect avicularia and the lateral processes 

 projecting forward are distinctive. In the figure the right hand 

 lateral process is seen edgeways. 



Catenicella acutirostris, n. sp. (PL II., Fig. 19). 



Zocecia ovate. Fenestrse 7. Lateral processes with deeply 

 depressed infra-avicularian and pedal chambers. Thyrostome 

 lofty, arched above, incurved below. Avicularia at upper angles, 

 with very long mandibles and a serai-circular cavity at the lower 

 part, separated from the mandibular cell by a bar. 



Locality.— "SlxxM^ Creek. (T. S. Hall). 



This is a solitary specimen and though imperfect it is 

 evidently quite distinct from any described species as the 

 avicularia are peculiar in having a long, almost acicular mandible 

 and a semi-circular cavity, with a perforation at the bottom, 

 separated from the mandibular cell by a bar, or plate ; the 

 avicularium on the right hand side (in the figure) is broken away 

 but a portion of the bar, or plate, is preserved. 



Costaticella, nov. gen. 



Zocecia ovoid, rather flat. Front surface with very numerous 

 narrow, elongated ribs diverging from a median line. 



This genus I institute to include the new species described 

 below and Catenicella lineata, of which Dr. MacGillivray remarks 

 that it is " a very peculiar species, totally unlike any other." 



