40 THE JOURNAL OF BOTANY 



the Isle of Man. Whether it is spreading at all it is not yet possible 

 to say. Though Cardigan Bay as a whole is not good for marine 

 algae, a certain amount of excellent ground occurs here and there 

 in both the northern and southern parts ; and the presence of a 

 very large number of species at Dinas Bay, Pembrokeshire, indi- 

 cates that algal spores are widely distributed, and that the plants 

 are ready to thrive when the conditions are suitable. Hence it is 

 unlikely that geological factors are wholly responsible for the 

 absence of the algge we have been considering. Their distribution 

 on the south and east of Ireland requires to be reinvestigated, 

 and when this has been done it will be profitable to again con- 

 sider the question of tides and currents. Meanwhile, this con- 

 tribution as to their distribution in Great Britain may not be 

 superfluous. 



P.S. — Since the above was written, an interesting paper by 

 C. L. Walton on the shore fauna of Cardigan Bay has come to 

 hand (Journ. Mar. Biol. Assn. vol. x. No. 1, Nov. 1913, pp. 102- 

 113). In describing the geological features of the bay, the author 

 draws attention to the large quantity of residual drift, and its 

 injurious effect on the fauna. He also notes the importance of 

 the dip and strike of the older rocks, and remarks that when the 

 strike is parallel to the coast, if the dip is low the rocks are 

 barren ; if high, with a landward dip, they are also barren ; but if 

 high and seaward, there may be a fairly good fauna on the land- 

 ward slope. With regard to these factors, contrasts as well as 

 similarities will be seen when the algal vegetation is considered. 

 Geological points of this nature have been largely overlooked by 

 writers on algal ecology ; but it is clear that for the more detailed 

 study of the vegetation they must be carefully considered, as they 

 not only directly account for the presence or absence of certain 

 associations, but in the case of hard rocks, especially, largely 

 determine the general contour of the foreshore. The points 

 emphasized by Mr. Walton do not, however, throw any further 

 light on the alg^ discussed above. 



DOESET PLANTS. 

 By H. W. Pugsley, B.A. 



During the summer of 1912, and again in 1913, I spent a 

 fortnight at Swanage, which is a good centre for field botany. 

 The following brief notes may be of interest. On both occasions I 

 searched on the east side of Littlesea for Scirjncsparvulus, but with- 

 out success ; and as other botanists have recently similarly failed 

 to find it there, I fear it may have been extirpated by the inroads 

 of the sand, which at some points is obviously advancing towards 

 the lake. In 1913 I was accompanied on several walks by Mr. 

 C. B. Green, who is compiling a very exhaustive list of local 

 records. 



