DEPARTMENT OF ZOOLOGY. 161 



The Salmonidse are of such great economic value that a 

 paper on their systematic arrangement may be mentioned 

 here ; also the acquisition of a series of Trout from the Black 

 Sea, a study of their scales showing that they grow as fast as 

 the Salmon on our own coasts. 



The Western Fisheries, Ltd., applied for advice before 

 sending a trawler to Lagos, and were told that the first step 

 towards estimating the economic possibilities of this region 

 was to make a collection and have it accurately determined ; 

 the collection, which was accordingly made by Mr. Cadman, 

 has been presented to the Museum, and a report has been 

 written on it. 



IV. MOLLUSCA. 



Several specimens of economic importance have been 

 determined during the year, of which the following are the 

 most noteworthy : — a Helicid agricultural pest {Helix carthu- 

 siana) from Egypt; a slug {Ve7'onicella vittata) devastating 

 rubber plantations in Jamaica ; a freshwater gastropod {Kata- 

 yama nosophora, n. gen. n. sp.) suspected in connection with 

 the transmission of Katayama disease in Japan. (A paper has 

 been prepared on this subject.) In addition, advice and 

 assistance have been rendered on the question of the use of 

 Mollusca as Trout-food and of West African shell-fisheries. 



V. Myhtopoda. 



A centipede {Geopliilus electricus) found in the human 

 intestine has been examined. 



VI. Arachnida. 



Inquiries on the following subjects have been dealt with : — 



1. A Gamasid mite (Leiognathus hacoti), normally para- 

 sitic on rats, biting human beings in shops at Sydney, on 

 the wharves at Fremantle, and also at Perth, Australia. 



2. The furniture mite {Glycyphagus domesticus). 



3. A mite (Fterolichus struthionis), occurring on Ostriches 

 imported into California. 



4. The distribution of certain Acari, injurious to vegetation, 

 introduced into this country (or likely to be introduced), 

 with imported plants. 



5. The possibility of the transmission of anthrax by 

 specimens of Hyalomma cegyptium found on a camel which 

 died from that disease at Aden. 



VII. Crustacea. 



Information has been supplied to the Board of Agriculture 

 and Fisheries regarding the species of Lobsters found at the 

 Cape of Good Hope. 



A species of freshwater Crustacean believed to be concerned 

 in the transmission of disease has been identified, and infor- 



