272 HISTORY OF BRITISH ZOOPHYTES. 



Statistical Account of the parish of Stevenstou/ of which 

 I was then minister, that I had got D'lscopora verrucaria 

 on the Ayrshire coast ; and as he had not fallen in Avith it 

 on the coast of Berwickshire, he would take it kind if I 

 would send it to him; — which I was most liappy to do. 

 Dr. Pleming's generic name was Liscoporaj and he made it 

 consist of two species, L. verrucaria and D. hisjyida. Dr. 

 Johnston formed two species of the Discopora or Tululi- 

 pora ; the first, T, patina, which seems a very distinct 

 species, and the other, T. hisjnda, which includes a portion 

 of Dr. Fleming^s D. verrucaria, viz. T. patina, and also 

 his B. hispjida, which was regarded by Dr. Fleming as dis- 

 tinct from D. verrucaria. Though no friend to the multi- 

 plication of species, we shoukl rather be disposed to make 

 three species instead of two. T. patina seems very dis- 

 tinctly one species ; and then we would have retained the 

 specific name of verrucaria for that state of it which is 

 truly wart-like, marked however by reticulated grooves; 

 and to those specimens which have not these grooves, but 

 have the denticles elongated into strong sharp spines, ren- 

 dering the surface quite rough, we would have been disposed 

 to give the name of T. hispjida. 



The little var. /3 is very common on some saccharine 



