262 Mr. A. W. Waters on Australian Bryosoa. 



exact shape of which I have not had the opportunity of 

 making out. 



Loc. Living: Ceylon [B.)] Port Phillip Heads {3facG.), 

 Port Western, Victoria ; north side of Watson's Bay, " under 

 stones," Port Jackson, Fossil : Waipukurau, New Zealand. 



90. LicTienopora grignonensis (Busk). 

 (PL VII. fig. 4.) 



Discoporella crassiuscula, Smitt, CEfver. K. Vetens.-Ak. Fork, vok xxiii. 



pp. 406 and 482, pi. xi. figs. 7-9. 

 Discoporella grignonensis, Busk, Crag Polyzoa, p. 116, pi. xx. fig. 4. 

 Lichenopor a grignonensis, 'Ridlej^Zool. Coll. ofH.M.S. 'Alert/ Proc. 



Zool. Soc. 1881, p. 57, pi. vi. fig. 2. 

 Lichenopora canaliculata P, Busk, Phil. Trans, vol. 168 (ex.), p. 199, 



pi. X. figs. 12-14. 



I have figured a specimen from Vaucluse Point, showing 

 the great variation in shape of the zooecial orifices, which near 

 the periphery have usually projections at the two sides, 

 forming what Ridley calls a sinus, in the central zooecia, and 

 have the inner side much raised, but also divided by a sinus ; 

 the outer side is also raised often into a pointed process. 

 Zooecial opening about 0'08 millim. The central zooecia are 

 much raised, and when there is no ovicell nearly meet in the 

 depressed centre of the zoarium. The ovicell covers the cen- 

 tral area and is formed by a network of trabecul^e, the inter- 

 spaces of which are closed by a calcareous perforated crust. 

 The sides of the zooecia have nodulated ridges, the nodules 

 sometimes becoming bluntly spinous. 



In the interior of the zooecia there are radiating spines 

 with knobs at the end, but also on the outside of the zooecia 

 there are similar spines projecting from the trabecular. This 

 is the first time, so far as I am aware, that these spines have 

 been recorded from the outside of the zoarium^ which seems 

 to make it more difficult to understand what their function 

 can be. 



I have a specimen from the Semaphore, Adelaide, in which 

 the nodulated ridges are much more distinct and the inner 

 part of the peristome is much raised, whereas the portion 

 turned towards the periphery of the zoarium is deeply cut 

 away ; another specimen from the same locality has the 

 nodulated ridges also well marked, but the peristome is nearly 

 round and entire, as figured by Busk in his L. canaliculata. 



I cannot see that there is sufficient ground for identifying 

 Busk's species with that of Milne-Edwards, and think that 

 L. canaliculata^ Busk, is probably the same as the Crag 

 fossil ; but since the shape of the aperture is figured as being 



