Mr. A. W. Waters on Australian Dryozoa. 3 



Membranipora ijyrula, Hincks. 



Membranipora pyrula, Ilincks, Ann. & Mag. Nat. Hist. ser. 5, vol. viii, 

 p. 31, pi. i. Hg. 2; MacGillivray, Zool. Vict. dec. xiii. p, 103, 

 pi. cxxvii. fig. 1. 



Memhraniporu lineata, MacGillivray, Zool. Vict, dec.iii. p. 34, pl.xxvi. 

 fig. 3. 



The spines in the Green Point specimen are not so stout as 

 those figured by MacGillivray in the thirteenth decade, but 

 somewhat stouter than those figured by Hincks. 



Hah. Bass's Straits, Victoria; Green Point, Port Jackson 



Membranipora levata, Hincks. 



3IernbranijJora levata, Hincks, Ann. & Mag. Nat. Hist. ser. 5, vol. x. 

 p. 467, pi. xix. tigs. 6, 6 a. 



The ovicell may be smooth or the umbo may form a keel. 

 M. irregularis, 13., as figured by Smitt in his ' Floridan 

 Bryozoa,' is similar in shape and general characters, but the 

 avicularia are wanting. 



Log. Houston Stewart Channel, 15-20 fath., and Cum- 

 shewa, British Columbia ; Green Point, Port Jackson. 



Membranipora lineata, L., var. (PI. II. tig. 16.) 



There are specimens from Green Point which differ from 

 the typical lineata in having a small round globular ovicell 

 without any rib. In one specimen the zooecia are connected 

 by tubes forming an areolated space, and on some of these 

 interzooecial connexions there are small triangular avicularia. 

 Similar connexions occur in M. circumclathrata, H., in M. 

 acuta, H., and sometimes in M. lineata, L, 



The present form differs from M. circumclathrata in having 

 small avicularia instead of large prominent ones. It is 

 very much like M. pectinata, MacG., but its zooecia could 

 not be described as large. 



Membranipora cervicornis. Busk (non Has well). 



Membranipora cervicornis, Waters, Quart. Journ. Geol. Soc. vol. xliii. 

 p. 47, which see for synonyms. 



In the specimen from Green Point the spines have all been 

 worn off, but the shape of the opesial opening, together with 

 the widely open ovicell, suffice for the determination. 



Loc. Liviu"- : Victoria ; South Australia ; Bass's Straits ; 



