92 Rev. T. Hincks's Contributions towards a 



with Lamouroux's Flustra mamillaris. Certainly neither his 

 diagnosis nor his enlarged figure gives any adequate idea of 

 the form in question. There is a certain general resemblance 

 in the shape and arrangement of the cells, but that is all. 

 The figure of the natural size indeed does closely resemble my 

 specimens, and the " marine plant " on which it is represented 

 as growing is, I believe, the same in both cases. The colour, 

 too, may probably be the same in the two forms ; but no 

 means of sure identification are supplied. Under all the 

 circumstances of the case, however, it may be better to assume, 

 on the strength of such minor resemblances as there are, that 

 Lamouroux had the present species before him, and so, to avoid 

 a change of name, the species will stand as Tkairopora 

 mamillaris^ Lamx.* (sp.). 



In my notes on this species I have drawn attention to the 

 importance of the opercular characters, and raised the question 

 as to their generic significance. MacCxillivray has since insti- 

 tuted tlie genus Tkairopora for this and kindred forms. I 

 quite agree with him that this genus finds its proper place 

 amongst the Microporidffi. 



Ibid. (p. 21 Sep.). 



Ilembranipora transversa. 



As already explained in the number of the * Annals ' for 

 Feb. 1881, Hutton was before me in describing this inter- 

 esting form, and his specific name [ciyicta) takes the place of 

 the above. MacGillivray has founded the genus Diploporella 

 for its reception t, and places it in tlie family Microporidje ; 

 but there may be a question, I think, as to its true syste- 

 matic position. 



* Annals,' November 1880 (p. 25 sep.). 



Memhranipora pedunculata, Manzoni. 



Waters refers this form to the Memhranipora conjluens, 

 Ileuss, and it would be premature to say that he is wrong. 

 But I may point out that the Ceylon species agrees much 

 more exactly with Manzoni's description and figure than 

 with those which he supplies \. The cells, as Manzoni 



* For sjTionyins see Miss Jelly's * Catalogue.' 

 t Trans. Roy. Sec. Victoria, April 1880. 



\ " Fossil Olieilostoinatous Bryozoa from Mount Gambier, S. Austra- 

 lia," Quart. Journ. Geol. Soc. August 1882, p. 202. 



