118 PAPERS, ETC. 



which is frequent in sandy pools, to the west of Minehead 

 Pier. Several species of tbe Cryptonemiaceae occur on the 

 coast, the rai'est of which is Grateloupia iilicina, growing 

 in pools on the Warren beach at Minehead, and I beheve, 

 with the exception of Aberystwith, this is the northernmost 

 Station that has yet been recorded for the plant. Gelidium 

 corneuai //., clavatum, Covers the rocks at Clevedon in dense 

 patches, barely half an inch in height, and at Minehead it 

 grows on wood work near high-water mark. Catenella 

 opuntia occurs in the same habitats as this species, both at 

 Clevedon and Minehead. I have also seen it vegetating 

 in crevices of the large boulders, under Greenaleigh-hill, 

 at Minehead. Gigartina mamillosa is found in pools on 

 the Warren beach, at Minehead, and is frequent at Bos- 

 sington. Chondrus crispus abounds in all the pools along 

 the coasts, but nearly ceases to vegetate at Clevedon, 

 where I only observed one small plant of it. Polyides rotun- 

 dus is common, growing in pools near low -water mark, on 

 the Warren beach, at Minehead ; and Dumontia filiformis 

 is likewise found there in pools nearer high-water mark, 

 and on Bossington beach. Among the tribe of the Cera- 

 miaceaj, three species of the genus Ceramium are frequent ; 

 the common C. rubrum is abundant on stones and on other 

 algee in tide pools. I remark at Minehead a pretty slender 

 corymbose variety of this plant, never more than four or 

 five inches in height. When immersed in fresh water it 

 decomposes much more rapidly than the larger and coarser 

 forms of the species. The ramuli are much incurved, and 

 though it cannot be considered as a distinct species from 

 C. rubrum, it is so distinct and well marked in its general 

 aspect from the many varieties of C. rubrum usually met 

 with, that I have deemed it right not to pass it over un- 

 notieed in the present paper. Its habitat, I have observed, 



