Letter from M. Humloldt to C. Delamlres. 165 

 Tulularia. 



T. indivisa. Leith shore and Shetland islands, 



ramosa. Ibid« 



Sertnlaria. 

 Of this extensive genus a great number of species occur 

 on our coasts. As it may be interesting to some to know 

 the species in this neighbourhood, I shall here enumerate 

 those I have found on the shores of Leith : 



S. n)sacea. 

 pumila. 

 operculata. 

 tamarisca. 

 abietina. 

 cupressoides. 

 cupressina. 

 argentea. 

 rugosa. 



volubilis. 

 nigra. 



S. halecina. 

 thuya, 

 falcata. 

 antennina. 

 verticillata. 

 cuscuta. 

 filicula. 

 nva. 

 lendigera. 



J*, phosphorea. 



jnirabilis. Muller. 



H.squammata. Mul- 

 ler, 



Edinburgh, 

 July igih, 1803. 



S^ geniculata, 

 dichotoma. 

 spinosa. 

 loriculata. 

 fastigiata ? 

 avicularia. 

 scruposa. 

 ciliata. 

 eburnea. 



Orkney and Shetland islands. 



My friend Mr. Brown, who is now 

 employed in exploring the natural 

 history of New Holland, found 

 this rare species near Aberdeen. 



Pennatula. 

 Firth of Forth. 

 Prestonpans bay, Firth of Forth, 



Hydra. 

 This Deautiful species I found on the 

 shore of the island of Burra, and 

 on the Holm of Cruster, in Bras- 

 say Sound, in Shetland. It was 

 adhering to the fiicus digitatus. 



XXVII. Ijctter from M. Humboldt to C. Delambres, 

 one of the perpi'tual Secretaries of' the National Institute*. 



MV RESPPCTKD FRIEND, Lima, Nov. 15, »8o2. 



Jl have just arrived from the interior of a country where 

 in a large plain I made experiments on the small horary 



"* From Aniiales di Museum d'Hisioiie Natmellc, No. 8. 



L 3 variations 



