(20) 



has generally been supposed, being, from its plain garb and tinassiiming 

 appearance, very likely often to be overlooked. We have not met with 

 it, and do not know of its having been found on the east coast ; the 

 only ascertained habitats being on the south-west coast of England, 

 several stations on the Irish coast, and the Orkney Islands [Lieut. 

 Thomas, in Phyc. Brit.) It is cvirious, however, to observe that these 

 are all regular hunting gTounds, and no doubt, were other parts of our 

 coasts equally well examined, other stations would be found. 



When not in fruit it is no easy matter to distinguish this fi'om Gra- 

 cilaria confervoides, even under the microscope, its somewhat brighter 

 colour, and a slight difference in structure, being by no means certain ; 

 when well fruited, however, no such difficulty exists, and the two may 

 be readily separated. It should be carefully looked for in rock-pools 

 near low- water mark, especially in such as are partially bedded with 

 sand, in which it has no objections to be partially buried. 



CORDYLECLADIA EKECTA. 



EXPLANATION OF DISSECTIONS, &c. 



Fig. 1. — Gordylecladia erecta, natural size. 

 2.— Pods. 



3. — Ti-ansverse section of a pod with tetraspores. 

 4. — A tetraspore. 

 5. — Branches with tubercles. 

 6. — Transverse section of branch and tubercle. All magnified. 



