The freshwater Rhizopoda have all been received from M. 

 Penard, and I have therefore thought it best strictly to follow the 

 nomenclature of his work, "Etudes sur les Rhizopodes d?eau douce, 

 1890." 



The marine Rhizopoda, or Foraminifera, are named in accord- 

 ance with the great work on the "Challenger" Foraminifera by my 

 late lamented friend, Dr. H. B. Brady. They are partly the product 

 of my own dredgings carried out on almost every part of the coast of 

 our islands, and of excursions during four summers to Norway and 

 Finmark ; and partly the results of the examination of material 

 kindly supplied to me from the " Porcupine," "Knight Errant," 

 "Triton," "Valorous," and "Challenger" expeditions. A few 

 species have been added by the kindness of friends, chiefly by the 

 late Dr. H. B. Brady, Mr. Joseph Wright, and the Royal Museum 

 of Stockholm (Dr. Goes). 



The Atlantic and Arctic Foraminifera are very fully represented, 

 but I have very few forms from the Mediterranean, in which sea, 

 indeed, they have been little studied, while the species of the North- 

 East American coast have not as yet received any attention. 



Letters should be addressed 



BURNMOOR RECTORY, 



FENCE HOUSES, 



Co. DURHAM. 



Catalogues already published : 



/ I. ECHINODERMATA. 



v II. PANTOPODA. 



III. CRUSTACEA. 

 (IV. MOLLUSCA MARINA. 

 1 V. BRACHIOPODA. 



VI. MOLLUSCA TERRESTRIA ET FLUVIATILIA. 



June i, 1892. 



