toith Descriptions of new Species, 413 



the preceding, from which however, as well as from L, hya- 

 lina, I am satisfied that it is distinct. 



Four specimens are on old valves of Pecten maximus : Dub- 

 lin Bay. 



Lepralia ovalis. 



Spec. Char. Crust whitish, glistening; cells well defined 

 and oval ; apertures circular, oblique, the lower margin rising 

 up into a short process, usually bifurcate, and furnished with 

 two, rarely three, teeth, the length of which exceeds greatly 

 the diameter of the mouths of the cells. 



This is a distinct, and, I imagine, a very rare species, as I 

 have but one Irish specimen attached to a piece of granite, 

 procured at Kingstown. From L. trispinosaofDr. Johnston, 

 a species with which I am not acquainted, it differs in being 

 very rarely provided with three spines, and in the absence of 

 the spout-like excavation represented in the figure of that 

 species ; while from L. immersa it is at once known by the 

 much larger size of the cells, discernible plainly by the unas- 

 sisted eye, as well as by other characters less obvious. This is 

 likewise an English species, being found at Burnham, Norfolk. 



Discopora verrucaria. 

 In my Catalogue of Irish Zoophytes, published in the ^ An- 

 nals,^ I mentioned the occurrence of Discopora hispida of Dr. 

 Fleming in the Bay of Dublin. I now find this statement 

 to be, so far as I am concerned, erroneous, the error having 

 arisen from my having mistaken the Discopora verrucaria, 

 Fleming, not uncommon in the Bay, and a very distinct spe- 

 cies, for that zoophyte, which has still, I believe, to be search- 

 ed for in the above locality. For a knowledge of the distinct- 

 ness of the two species I am indebted to the Rev. David 

 Landsborough, who kindly presented me with specimens of 

 both, found by him at Stevenston, Ayrshire. 



Madrepora verrucaria of Otho Fabricius ? 

 A few w^eks back I received specimens of a Tuhulipora from 

 the Rev. David Landsborough, marked with doubt as the T, 

 verrucaria of Milne Edwards ; an examination of these in- 

 duced me to refer to some specimens of a Tuhulipora which 

 I obtained in 1839 in Dublin Bay, and which I had hitherto 

 regarded as a variety of T. patina. The result of this re- 

 ference was, that I found that my specimens and those of Mr. 

 Landsborough represented the same species, mine being 

 much the larger, and Mr. Landsborough's being distinguished 

 by a circular ridge running midway between the centre and the 

 circumference of each disc; but that neither were the Tuhulipora 

 patina of Lamarck, nor the T, verrucaria of Milne Edwards, 

 but a distinct species ; a description of which, together with 



