1875.] On the Structure and Relations of certain Corals. 59 



Dr. Michael Foster has shown that amyloid substance exists largely in 

 the bodies of certain Entozoa, as, for instance, the round worm and the 

 tapeworm. Again we have a condition which harmonizes with the other 

 conditions under which its accumulation is observed to take place ; for 

 situated as these animals are in the intestinal canal, their position is one 

 which is peculiarly restrictive of a supply of oxygen. My own observa- 

 tions have revealed its extensive existence in the mantle of the mussel, 

 and Bernard has recognized it in the larvae of flies. These instances, if 

 not specially illustrative of the point under consideration, nevertheless 

 appear to me to stand in conformity with the previous evidence. 



Looking at all the considerations which have been here brought 

 forward, I think we may generalize and say that the amyloid substance 

 is a body which tends to accumulate in certain animal structures under 

 the existence of a limited supply of oxygen, and that it is in consequence 

 of the liver exceptionally receiving the supply of venous blood it does, that 

 the special condition belonging to it is attributable. I have shown that the 

 undue transmission of oxygenated blood to the organ at once induces 

 an altered state, which is rendered evident by the production of glycosuria. 



I consider that another link has been added to the chain of evidence 

 against the glycogenic theory, which I have never wavered in regarding 

 as untenable since the communication of my former researches to the 

 Royal Society. 



III. " On the Structure and Relations of the Alcyonarian Heliopora 

 ccerulea, with some Account of the Anatomy of a Species of 

 Sarcophyton; Notes on the Structure of Species of the Genera 

 Millepora, Pocillopora, and Stylaster ; and Remarks on the 

 Affinities of certain Palseozoic Corals." By H. N. Moseley, 

 M.A. (Oxon.), Naturalist to the 'Challenger' Expedition. 

 Communicated by Professor Wyville Thomson, F.R.S., Di- 

 rector of the Civilian Scientific Staff of H.M.S. ' Challenger/ 

 Received September 28, 1875. 



(Abstract.) 



Introduction. — The author having undertaken the examination of the 

 Deep-sea Corals dredged during the voyage of H.M.S. ' Challenger,' was 

 led to the study of the structure of corals generally, and especially to the 

 examination of the Milleporidae, which seemed of peculiar interest, since 

 they had been determined by Professor Agassiz to be Hydroids, and had 

 been regarded by him as living representatives of the Paleozoic Rugosa. 

 Millepora alcicomis was obtained and examined at Bermuda, and another 

 species of Millepora at Zamboangan, Mindanas, Philippine Islands. The 

 examination of these Millepores was found to be beset with great dim- 



