84 DUBLIN UNIVERSITY 



a projecting crescentic beaded rim ; posterior surface convex, encroach- 

 ing on the cavity of the next cell, against which it is cemented, and 

 which is sessile on the ovicelligerous cell. 



Probably allied in habit to C. taurina (Busk), as its resemblance to 

 Thuiaria thuia is remarkable. Coenoecium very calcareous. 



Bass's Strait ; abundant ; Dr. Harvey. 



16.— C. perforata (Busk). Plate VI., Fig. 2. 



Bass's Strait ; abundant ; Dr. Harvey. 



The ovicellof this pretty species resembles that of C. taurina (Busk). 

 It is galeate, tuberculate, sessile on the apex of one of the cells of a ge- 

 minate pair. 



8 — Cateniciell^; siMriiCES (Busk). 



17. — C. carinata (Busk) . 



New Zealand ; Dr. Joliffe. 



e.— Catenicell^: aubitje ( Wyv. T.) 

 18 — C. aurita (Busk). 

 Bass's Strait and Fremantle; Dr. Harvey. Port Fairy; J. Dawson, 

 Esq. New Zealand ; Dr. Joliffe. 



Fine specimens have the front richly tuberculated. Three or four 

 tubercles below the mouth are perforate ; but there is no approach to 

 the true fenestrate character. 



19 C. geminata, n. s. Plate VII., Figs. 3, 4. 



Axial cell geminate. The secondary cell developed alternately on 

 either side of the axis. Axial cells pyriform; a large gaping avicularium 

 on the angle opposite the secondary cell. Secondary cell giving off by 

 a terminal horny tube a single wedge-shaped peripheral cell. Cell-mouth 

 large ; a deep notch in the centre of the lower lip. In the primary and 

 secondary axial cells four or five blunt spines surround the upper margin 

 of the mouth, which is surmounted in the peripheral cells by two longer 

 ear-like processes. Front of cell tuberculated. Ovicell unknown. 



A small species, apparently generally distributed in the Australian 

 seas. Epiphytic on red Algae. 



Bass's Strait and Fremantle ; Dr. Harvey. Port Fairy; Mr. Dawson. 

 New Zealand ; Mr. Joliffe. 



