REPORT ON THE BOTANY OF THE ATLANTIC ISLANDS. 7 



DlATOMACE^I. 

 Navicula didyma, Kiitz. 



flavicula didyma, Kiitz., Bacill., p. 100, t. 4, fig. 7, et t. 28, fig. 75 ; Sp. Alg., p. 83; Dickie in Journ. 

 Linn. Soc. Lond., xiv. p. 359. 



St Paul's Rocks. Moseley. 

 North America. 



Rhambdonenia adriaticum, Kiitz. 



Rhambdonema adriaticum, Kiitz., Bacill., p. 126, t. 18, fig. 7, et Sp. Alg., p. 116; Dickie in Joum. 

 Linn. Soc. Lond., xiv. p. 359. 



St Paul's Rocks. Moseley. 

 Adriatic ; Mediterranean ; Black Sea. 



Biddulphia pulchella, Gray. 



Biddulphia pulchella, Gray; Dickie in Journ. Linn. Soc. Lond., xiv. p. 359. 

 Biddulphia Irilocidaris, Kiitz., Sp. Alg., p. 137. 



St Paul's Rocks. Moseley. 



West Indies and coast of Peru. 



These are the only diatoms observed ; they were procured by washing some specimens 

 from the nests of the Sterna ; guano from the same might have yielded other species. 



