170 



by a line, which passes ohli(|ueiy proxiinally from the outer corner lo Ihe oppo- 

 site lateral margin almost parallel with the proximal truncated part of the poly- 

 pide-tiibe. The part of the basal surface of the polypide-lube, which lies distally 

 to the just mentioned angularly bent line, has an independent wall, while the 

 basal wall in the proximally directed part is exclusively or mostly formed by 

 the basal wall of Ihe zocrcium. The obliquely ascending distal wall has within 

 its basal margin a multiporous rosette-plate on each side, and a similar plate is 

 found in the distal half of each lateral wall. In Ihe apjiroximate centre of the 

 distal margin of the cryptocyst a larger or smaller tubercle rises, from which five 

 yellow, proximally connected bands take their origin. They appear to be fastened 

 to the covering-membrane, and the same thing seems lo be the case with a 

 similar number of bands, which spring from the outer lateral wall. These bands 

 are undoubtedly parietal muscles. Each of the margins of the colony shows a 

 series of narrow kenozooecia which have a wholly membranous frontal cover 

 and no cryptocyst. 



Besides a small fragment liom King George's Sound, West Australia, for which 

 my thanks are due to the late Mr. Feal, I have examined a number of colonies 

 from Australia, found in the herbarium of alga^ in the Hotanical Museum. The 

 species has hitherto lieen found only on Anuinsid pinnaiifuln. 



Siphonoporella nodosa Hincks. 

 Annals Nat. Hisl. ser. 5, Vol. 6, pag. 90, PI. XI. fig. 10. 

 (in. VI, fif^s. 2 a, 21)). 

 As I have only been able to examine a small fragment of this s|)ecies (from 

 Australia), which I lost before I had completed my examination, I shall here 

 only make some comparative and supplementary observations. As in Ihe |)re- 

 ceding species we find here a proximal, but much stronger developed gymnocyst, 

 a pent-roof-shaped cryptocyst and a |)olypidc-tube, which is continued proxi- 

 mally under the cryptocyst roof. The dislnl part of the |)olypide-tul)e is however 

 very short, and the whole of its basal wall is formed exclusively or nioslly by 

 the basal wall of the zooecium. The distal wall is niso here somewhat ascending 

 and provided with two multiporous rosette-plates. The dist;d half of each lateral 

 wall with 1 —2 similar plates. 



Family Aspidostomidae. 



The zocvcia, in which a raised margin is often indistinctly or incompletely 

 developed, are always without spines and have generally a strongly developed 

 distal end, sometimes projecting in the shape of a pent-roof. The two opesiulaj 



