DEPARTMENT OF ZOOLOGY. 125 



Other reports have been prepared upon a small collection of 

 Cephalopoda from the Montebello Is., on the Australian 

 species of the Family Mactridie, and on general collections 

 from South Africa, Lagos, the Philippine Is., Grand Cayman, 

 and Easter Island. The anatomy of Marinula tristanensis 

 has been studied and a paper upon it prepared for publication. 

 The various conchological forms of Bursa ruhata, a polymorphic 

 species, have been described and figured. The study of the 

 Gastropoda obtained by the "Terra Nova" has been com- 

 menced and is now in progress. Advice and assistance have 

 been given for the carrying out of genetic experiments upon 

 the albinic form of Helix aspersa. The arrangement and 

 preparation of the Blanford and Godwin-Austen Collections of 

 Indian land and fresh-water Mollusca have been continued by 

 Lieut.-Col. H. H. Godwin-Austen, F.R.S. 



During the year, 54 microscopic preparations, of which the 

 majority were made in the Museum, have been added to the 

 collection of slides. In the early part of the year an expedi- 

 tion was undertaken by Mr. Kobson to Sardinia with the 

 principal object of studying and collecting the Molluscan fauna 

 of the central mountain range of the Island. Illness, however, 

 prevented the attempt from being carried beyond the initial 

 stages. 



Brachiopoda. 



The Brachiopoda obtained by the •' Terra Nova " Expedition 

 have been handed over to Mr. J. W. Jackson for study. 



In addition to the above, only two other specimens have 

 been added to the collection, Lingula sp. from Manila, presented 

 by C. S. Betton, Esq., a^d Terebratulina kiiensis from Sagami, 

 Japan, purchased. 



Myriopoda and Arachnida. 



Special attention has again been given to the study of 

 parasitic Acari ; and reports dealing with the forms occurring on 

 the Brown Rat (^Epimys norvegicus) in Great Britain and with 

 those found on the species of Rodents which frequent human 

 habitations in Egypt, have been prepared. The Arachnida and 

 Myriopoda obtained by the British Ornithologists' Union 

 Expedition and the Wollaston Expedition to Dutch New 

 Guinea have also been reported upon. The arrangement and 

 registration of the Koch Collection are still in progress, but 

 the first half has been labelled and put away. Two more 

 models of Amblyomma hebroeum were made during the year. 

 The series illustrating the external structure and stages in the 

 life-history of a Tick is thus now complete, and it has been 

 placed on exhibition in the Central Hall. 



Crustacea and Pycnogonida. 



All the exhibited speciiriens preseived in spirit have been 

 overhauled and the jars have been cleaned and refilled. 



