Mr. A. W. Waters on Australian Bryozoa. 257 



Specimens from Green Point correspond entirely with 

 MacGillivray's description j but I believe that Haswell's 

 name, which has priority, ought to be adopted, though as 

 long as there is any uncertainty it is better to adhere to 

 interjuncta. 



It forms a subglobular intricate mass nearly two inches 

 across, made up of slender branches, which dichotomize and 

 are attached to one another by delicate tubes thrown across 

 from neighbouring branches : similar tubes are often thrown 

 out as long delicate rootlets ; these tubes are usually single, 

 but sometimes in bundles. The zooecia are smaller than 

 those of 7. Milneana, the aperture only measuring 0*14 millim., 

 and the dorsal striation is more distinct in these specimens 

 than in /. Milneana from the same locality. The ovicell, as 

 shown in the figure, is an inflation occurring usually at the 

 junction of the branches, and embraces many zooecia; the 

 surface of the ovicell is more finely punctured than that of 

 the zooecia, and the aperture is wide, with a raised funnel- 

 shaped peristome. 



It will be seen in figure 29 that the middle connecting-tube 

 passes from the right-hand branch to the left, whereas the 

 other two arise from the left- and are attached to the right- 

 hand branch. 



Kirchenpauer describes (Mus. GodefFroy Cat. iv. p. xxxiii) 

 similar connexions in Idmonea flabellata, from the Gulf of 

 St. Vincent. 



Loc. Port Phillip Heads {MaoG.) ; Green Point, Port 

 Jackson, 8 fath. 



81. Filisparsa tuhulosa (Busk). 

 Hornera violacea, var. ^, tuhulosa, Busk, Cat. Mar. Pol, pt. iii. p. 19, 



pi, xviii. fig. 4, 

 Filisjmrsa tuhulosa, Waters, Ann, & Mag. Nat. Hist. ser. 5, vol. iii. 



p. 275. 

 Filisparsa Dehauxi, Pergens, " Pliocene Bry. von Rhodos," Ann, k,-k. 



Hofnius. vol. ii. p. 6. 

 Idmonea gasparensis, MacG. "New or Little-known Polyzoa," pt. xii., 



Trans. Roy. Soc. Vict, p. 7 (sep.), pi. ii. fig. 3. 

 Filisparsa, sp., Mauzoni, Mem. de la Soc. G6ol, de France, 3* s^r. vol. i. 



pt. ii. p. 69, pi. iii. figs. 18 a and 18 h. 



There is one piece from Holborn Island, 20 fath., which is 

 more delicate than I. irregularis and has fewer zooecia. The 

 oral aperture is 0'15 millim. wide. There is no ovicell, but 

 my specimens from Naples have ovicellular enlargements 

 embracing several zooecia near a new branch on the front 

 surface. The numbering of Busk's figures in his description 

 and his explanation of the plates does not correspond, and it 

 is very difficult to know what was meant. 



