This collection owes its origin to the purchase, a few years ago, 

 of the well-known European collection of the late Dr. Tiberi, of 

 Naples, which, while good generally, was especially rich in South 

 European forms, and in types received from describers. It has been 

 since increased, chiefly by purchases, and at the present time contains 

 more than twice as many forms as were in the Tiberian collection. 

 The additions consist for the most part of East European, North 

 Asiatic, North African, and Madeiran species. 



I shall be glad to further add to it by purchase or by exchange. 

 My duplicates of inland Mollusca are chiefly of South European 

 species. I can, however, offer Marine Mollusca or other invertebrata; 

 but unfortunately feel it necessary to guard myself by saying that it 

 must not be expected that I should send rare Marine Mollusca, the 

 acquisition of which has involved heavy expense, in exchange, 

 specimen for specimen, for sub-species of inland Mollusca which prove, 

 when received, to be scarcely, if at all, distinguishable from others 

 already known to me. At the same time I would have it understood 

 that I desire to obtain all described forms, if named by authorities, 

 since it is only by the examination of specimens that the value of a 

 named form can be guaged correctly. 



Subgeneric names have only been introduced into those genera 

 which embrace the largest number of species. 



It is my usual habit to commence specific names which have 

 reference to persons with a capital letter, and all others with a small 

 letter ; but in the present list, as there are some names of the origin 

 of which I am ignorant, and which may be derived either from places 

 or persons, small initials have in all cases been employed. 



Letters should be addressed 



BURNMOOR RECTORY, 



FENCE HOUSES, 



Co. DURHAM. 



Catalogues already published : 



I. ECHINODERMATA. 



II. PANTOPODA ( = PYCNOGONOIDEA.) 

 III. CRUSTACEA. 

 IV. MOLLUSCA MARINA. 



V. BRACHIOPODA. 



April 5, 1890. 



