LITHOPHYLLUM IN THE BRITISH ISLES 115 



ovate, testa very densely and minutely muricate. The persistent 

 petals, which are shorter than calyx-lobes, are quite peculiar to 

 this species, and are not to be met with in other species of 

 Boykinia. 



Appendix. 



From all other parts of Japan, excepting Korea, the following 

 species have been recorded : — 



S. sendaica Maxim, in Bull. Acad. St. Petersb. xviii. p. 38. 



Hab. Central Japan. 



S. nipjponica Makino, I. c. xv. p. 10. 



Hab. Central Japan. 



S. tellimoides Maxim, in Bull. Acad. St. Petersb. xvi. p. 216. 



Hab. Central Japan. 



Var. Watanabei (Yatabe), Makino, I. c. xv. p. 12. 



Hab. Southern Japan. 



S. cernua Linn. Sp. PI. p. 403. 



Hab. Alpine region of mountains. Central Japan. 



On varieties and forms of S. cortusifolia and S. madida cf. 

 Tokyo Bot. Mag. xv. p. 12 ; xvi. p. 202 ; xxiii. p. 72 ; xxiv. pp. 30, 64. 



LITHOPHYLLUM IN THE BRITISH ISLES. 

 By a. D. Cotton, F.L.S. 



In the Catalogue of British Marine Algje by the late 

 E. A. L. Batters, it will be noted that no mention is made of 

 LitJiopliyllum fasciculatum Eosl., the plant figured by Harvey as 

 Melobesla fasciculata in Phycologia Britannica (Plate Ixxiv.). A 

 careful perusal of the species enumerated in the Catalogue, and 

 especially of their distribution, shows that L. fasciculatum is 

 united with L. Bacemus Fosl. As interpreted by Foslie, and as 

 generally understood at the present time, these two species, 

 though occasionally resembling each other in form, are perfectly 

 distinct, and there can be little doubt that the manner in which 

 they are presented by Batters is due to an oversight, although 

 positive proof of the fact is not forthcoming. Considering the 

 important place the Catalogue holds amongst algologists, and the 

 entirely different distribution of the two species, a note of 

 explanation and correction has been thought advisable. 



It is well known that Lithothavmia are exceedingly difficult 

 to examine, and that for microscopic investigation they require 

 special methods of manipulation. The late M. Foslie of Trond- 

 hjem devoted many years to their study, and was the recognised 

 authority on the group, and although it is now impossible to refer 

 the matter to him, his views on the species in question are clearly 

 expressed in several of his published papers. The specimens in 

 the Batters collection at the British Museum throw no light on 

 the subject, and there is no direct evidence as to his views; but it 

 is well known that Batters consulted Foslie as to British Litho- 



