PART V 



TOXOGLOSSA 



WITH A SUPPLEMENT 



The very interesting section of the Toxoglossa contains 228 species, of which no less 

 than 65 appear to be new to science, moreover to this part a small supplement to preceding 

 parts has been added, containing 3 new species. 



The family of the Pleurotomidae, with 127 enumerated species and a few varieties, has 

 given me mucrr trouble, but has not given me full satisfaction, the systematic position of many 

 species remaining still more or less doubtful and the classification of this family much wants a 

 revision. I have often foliowed the arrangement of the late Prof. Boettger for the species from 

 the Philippines. The relatively small number of specimens dredged with the soft parts, prevented 

 me from examining the radular teeth, in most cases where they might have given some light. 

 Under these circumstances, I am very grateful to those persons who have assisted me in the 

 identification of critical specimens. Mr. E. A. Smith I.S.O. often compared them with the 

 treasures of the British Museum, Mr. J. Cosmo Melvill has given me his advice and in some 

 cases specimens for comparison, Mr. J. R. le Bockton Tomlin likewise assisted me by identi- 

 fication or loan of specimens, Mr. J. J. Verwijnex has again much obliged me by the loan of 

 books from the rich library of Teyler's Museum, and other persons amongst which I wish to 

 name Dr. R. Horst, have assisted me in several ways. I beg them all to accept my kind thanks. 



In two cases I was compelled to erect new genera of Pleurotomidae, as it was impossible 

 to locate the species in the existing ones, though I was not at all eager to enlarge the 

 number of groups, as long as no revision of the whole family has been undertaken by some 

 person who is in particularly favorable conditions, to fulfil this much needed but very trouble- 

 some task. 





SIBOGA-EXPEDITIE XLIXV. 48 



