356 Messrs. E. G. Nelson and P. M. Duncan on the 



generative organs are recognized on tlie protruded polyps 

 of Millepora^ and until the mesenterico-ovarian layers are 

 proved not to exist Avithin the calices. The external resem- 

 blance of the Millepore-polyps to the sterile Hydractinice is 

 evident." In the same report it is noticed that '''■ Millepora 

 is a most aberrant genus if it be one of the Madreporarian 

 Tabulata. I have not yet satisfied myself about the Hydroi- 

 dean characteristics of its soft parts j but an examinatio-n of the 

 coenenchyma of a series of species throws great doubt npon 

 the Madreporarian affinities." The intimate nature of the 

 hard parts was thus noticed in the same Report^ p. 126 : — 

 "A careful examination of the calices of good specimens 

 determines that the trabeculje of which the coenenchyma is 

 composed often projects into them in the position of septa ; 

 but there is nothing like the regular arrangement as seen in 

 Heliopora or in the Poritida? of the Perforata. The cells of 

 the coenenchyma may occasionally be seen to open into the 

 space above the last tabula. The absence of septa and this 

 relation of the coenenchyma to the gastric spaces are most 

 important. The tubular nature of much of the coenenchyma 

 is evident ; and longitudinal sections prove that the spongy 

 nature is by no means constant or uniform." In the ' Trans. 

 Connecticut Acad, of Arts and Sciences/ vol. i. 1868-1870, 

 Prof. E. A. Verrill demolished the theory that because Mille- 

 pora is a Hydroid all the other Tabulata belong to the same 

 order. He admits the Hydroid nature of the polyp of Mille- 

 pora, and shows that Bradley has proved that Pocillopora has 

 animals identical in structure with most typical genera of true 

 polyps. He notices the twelve septa of the species of this 

 last genus, and that the genus is a true Madreporarian allied 

 to Oculina and StyJophora. (See also the same author, " On 

 the Affinities of the Tabulate Corals," Proc. Essex Instit. iv. 

 p. 90, 1869.) Bradley described the polyps of Pocillopora 

 lacera-j Verrill, as having twelve equal cylindrical tentacles, 

 which are swollen at the tips (six are horizontal, and six up- 

 right : Verrill, Notes &c. p. 523). 



A paper was read at the Royal Society (received Sept. 28, 

 1875) by H. N. Moseley, M.A., Naturalist to the 'Challenger' 

 Expedition, "On the Structure and Relations of the Alcyona- 

 rian Heliopora ccerulea, with some Account of the Anatomy of 

 a Species of Sarcofliyton ; Notes on the Structure of Species 

 of the Genera Millepora, Pocillopora^ and Stylaster ; and Re- 

 marks on the Affinities of certain Palaeozoic Corals." The 

 author examined Millepora alcicornis at Bermuda and other 

 species elsewhere, and remarks that " the examination of these 

 Millepores was found to be beset xoith great difficulties^'' but 



