Natural History of East Fininarh, 89 



Surface of zoarium with raised nodulous processes. No 

 avicularia. No pore-chambers. 



Ammatophora nodulosa is a rare species which I liave only 

 seen from two localities — in deep water oflp the Antrim coast, 

 and in about 15 fathoms at Guernsey; in the former case on 

 a stone, in the latter on small valves of Pecten oj)€rcuIarift. 

 The living zoarium is covered Avitli a glistening yellowish 

 epithcca, which conceals much of the real structure. The 

 operculum in the Guernsey specimens is simple and the 

 margin but slightly thickened ; in the Antrim specimen it is 

 more highly chitinizecl, in form of half a circle, with the lower 

 corners slightly turned out. The nodulous processes consist 

 generally of one at the bottom of the zooecium or of two at the 

 angles of the bottom. The ooeciura rests upon, but is not 

 firmly united with, the knob which terminates the side wall 

 of the zooecium. It is very difficult to understand the dif- 

 ferent forms which the ooeciura assumes, and which will be 

 better understood from the figures (figs. 5, 6, 7) than from any 

 description. The figures and generic characters are drawn 

 from specimens which have been boiled in liquor })otassse, and 

 thus the epithcca have been removed. Hincks^s drawing 

 represents the zoarium in its natural condition. This is a 

 very curious species ; in the process of boiling some of the 

 ooecia entirely separated themselves from the zooccia, and that 

 without any fracture. The granulated knob at the summit 

 of the side walls, and the knobs of the ooecium which rests 

 upon it, forcibly reminded me of the limb-joints in the 

 human body ! 



Genus Rosseliana, Jullien, 



Unsseliana, .Tullien, 'Mission Scientitique du Cap Horn, 1882-1883,' 

 1888, p. 79. 



Type, Rossdiana (Fiuslra) liosselii (Audouin). 



Membranipora liosselii, Hincks, Hist. Brit. Marine Polyzoa, p. 16G, 

 pi. xxii. fig. 4. 



There are two, more rarely three, pair of lateral pore-cham- 

 bers and one large distal one — this last sometimes divided 

 into two or three ; but the chambers do not project beyond 

 the breadth of the walls. In a specimen coating the inside of 

 a shell of Pecten opercularis, in that part which was attached 

 to the wavy portion near the edge of the Pecten, the back 

 wall of the zoarium was much thickened and every zooecium 

 was separately marked out (i. e. higher in the middle and 

 sloping at the sides) : and each bore about three pustules 



