20 Mr. A. W. Waters on Australian Bryozoa. 



There are some specimens from Green Point larger than 

 the one previously mentioned, and they are more strongly 

 calcified. In the most typical C.granum the peristome is not 

 continuous, but carried up in " front ; " and in one specimen 

 from Green Point the peristome is in some zooecia continuous, 

 in others merely projects in front as if one half had been cut 

 away, giving a very different appearance to the zooecia. The 

 same thing occurs in the Naples form (see Ann. & Mag. 

 Nat. Hist. ser. 5, vol. iii. p. 195). 



In the Green Point specimens there are large vicarious 

 avicularia with the mandibles very wide at the distal end, just 

 as in C. Costazii, Aud. 



There seems to be a group of Celleporce with subglobular 

 ovicells part way up a somewhat tubular zooecium ; the ovi- 

 cells have a distinct area surrounded by elongate or radiating 

 pores. They are known as C. granunij H., C. Boryii, Aud., 

 (7. Costazii, Aud., C. HassaUii^ Johnst., C, cosfata,, MacG., 

 C. retusa var. canmiata, Waters, 0. plafalea, MacG., Lageni- 

 fora nitensj MacG., L. spmulosa, H., Pliylactella lucida, H., 

 C. 9'ofa, MacG., C. nidi's, B., C. hilabiata, B., C. signata, B. ; 

 but these should be reduced to two or three species. 



In Cellepora perhaps we may see the signification of the 

 perforated area on the ovicell which occurs in so many species. 

 As growth of the colony progresses the ovicell becomes more 

 and more immersed, often nothing being seen of it except the 

 perforated calcareous wall of the area, and no doubt a readier 

 communication with the surrounding water is thus maintained 

 to the last. There are, however, many species in which the 

 ovicell has only a lunar mark of thinner structure ; this may 

 be a degenerated form of the perforated area, where a less 

 erect growth of the zooecia has made the perforation of less 

 importance. 



A somewhat similar structure occurs in other genera, and 

 then all except the area may become immersed, as, for in- 

 stance, in Smittia marmorea. 



Stomatopora {ncrassata, Smitt. 



Stomatopora incrassata, Hincks, Brit. Mar. Polyzoa, p. 436, pi. lix. 

 figs. 1^3. 



The Green Point specimens are no doubt identical with the 

 form described by Mr. Hincks ; but as I am not sure about 

 other descriptions reference is only made to his. 



The branches anastomose, and from various parts erect 

 " cylindrical processes " rise up. These erect fasciculi remind 

 us of Fasciculipora helUs, MacG. (see Ann. & Mag. Nat. Hist, 

 ser. 5, vol. xx. p. 259) ; but in the latter they are about 



