british museum (natural history). 117 



Index Museum and Morphological Collections. 



All the dissections exhibited in the Central Hall have been 

 examined during the course of the year ; 17 glass vessels have 

 been refilled with alcohol, and 14 dissections and 7 dry prepara- 

 tions have been remounted, and 8 new preparations have been 

 added, including dissections of parts of Manatee, Porpoise and 

 Whale. 



A model of the Common House Fly (Musca domestica), 

 enlarged to the same extent (28 diameters) as those of the 

 Tsetse Fly and Mosquitoes already exhibited, has been made 

 and placed on a special table in the middle of the Hall, together 

 with actual specimens of the four species of Fly commonly 

 found in houses. Models of the larva and pupa of Musca 

 domestica will be added in due course. 



The series of 153 Insects exhibiting Mimetic Resemblance 

 has been revised and listed. 



In consequence of the continued interest taken by the 

 public in the series of 251 specimens and groups of specimens 

 brought together in 1909 in commemoration of the centenary 

 of the birth of Charles Darwin and the 50th anniversary of the 

 publication of " The Origin of Species," this series, known as 

 the " Darwin Exhibition," has been allowed to remain intact 

 during the year. A second edition of the Special Guide Book 

 " Memorials of Charles Darwin " was published on March 3rd 

 1910. 



A set of some 150 animals and parts of animals has been 

 selected and arranged as a preliminary or trial series for an 

 "Index Case," to explain the general classification of the 

 animal kingdom, and to indicate in what part of the Museum 

 a visitor may find any particular group of animals he may 

 wish to study. The series, being but a tentative one, is not yet 

 on exhibition. 



In the Economic Series in the North Hall 6 additions have 

 been made, 108 specimens have been remounted in alcohol, and 

 129 labels have been redrafted and typewritten. 



In the Arthropod Gallery one new dissection has been 

 introduced, and 6 specimens in alcohol have been remounted. 



Two new preparations in alcohol have been added in the 

 Shell Gallery. 



In the Whale Gallery a model of the ear of Baloenoptera 

 has been added. 



L. Fletcher, 



Director. 



British Museum (Natural History), 

 25 February. 1911. 



