308 A. W. WATERS ON CHlLOSTOMATOrS BEYOZOA FKOM 



such teeth can be detected in the typical C. fossa, but this is excep- 

 tional. 



Loc. Eiyer-Murray Cliffs. 



Fig. 3. — Zooecium of Cellepora fossa, var. marsupiata. 

 (Enlarged 25 diam.) 



71. Lektthopoea hysteix, MacG. 



Lelcythojpora Tiystrix^ MacGillivray, "Descriptions of I^ew or 

 Little-known Polyzoa," pt. iii. p. 194, Trans. Eoy. Soc. Yict. vol. xix. 

 pi. i. fig. 6 ; also pt. yiii. p. 8, pi. ii. fig. 6 (advance copy). 



In the growth and the shape of the cells this so much resembles 

 various Cyclostomata that until sections were prepared I did not 

 recognize that it was a Chilostoma ; and even after careful examina- 

 tion the fossil remains very incomprehensible, and further study of 

 recent specimens is much to be desired. The state of fossilization is 

 not favourable for studying the minute structure. The zooecia, which 

 are subtubular, open only on one side of the zoarium, and are erect 

 and often more or less in bundles, giving the appearance of Frondi- 

 jpora. The small opening on the side of the aperture which 

 MacGillivray describes as an avicularum, is only distinguishable in 

 a few cases. On the front of the zoarium there are a number of 

 globular mamillations, sometimes with a small opening in the centre. 

 These much resemble the enlargements on the front of the cell 

 •which Professor MacGillivray describes as ovicells ; but these 

 enlargements in the fossil are usually entire, with comparatively 

 large pores on the surface. The solid under surface of the zoarium 

 has a few irregularly scattered large-sized pores. 



72. Ctjpulaeia CANAEiEifsis, Busk. 



Cujoularia ccinariensis, Busk, Q. J. Micr. Soc. vol. vii. p. 66, 

 pi. xxiii. figs. 6-9 ; Crag Polyzoa, p. 87, pi. xiii. fig. 2 ; Manzoni, 

 Foss. Ital. Contrib. i. p. 10, pi. ii. fig. 17; Bri. foss. del Mioc. 

 d'Aust. ed TJngh. p. 24, pi. xvii. fig. 56. 



> Memhranipora canariensis, Smitt, Floridan Bryozoa, pt. 2. p. 10, 

 pi. ii. figs. 69-71. 



Specimens from Aldinga have larger zooecia and larger opesial 

 openings than some recent specimens from Princess Charlotte Bay. 

 In the recent one the sulcate structure of the under surface is very 

 marked ; but upon careful examination faint cross-divisions can also 

 be distinguished, thus separating the dorsal surface into zooecial 



