THE AiNNALS 



AND 



ilAGAZINE OF NATUEAL HISTORY 



[NINTH SERIES.] 

 No. 48. DECEMBER 1921. 



LIX. — On some Dipterous Larvce infesting the Branchial 

 Chambers of Land-crubs. By D, Keilin, Sc.D., Beit 

 Memoii:il Research Fellow (from the Quick Laboratury, 

 Uuiversity of Cambridge). 



To the great variety of conditions under Avliich Dipterous 

 larvtB of ditfercnt kinds are founds Baylis(1915) * has added 

 an interesting record by his discovery of a novel habitat, 

 namely, within the branchial chambers of certain land- 

 crabs. 



The record is as follows : — 



(1) Of three specimens of a land-crab — Cardiosoma hirtipes 

 — from the Admiralty Islands (' Challenger ' Collection), 

 two were found to contain Dipterous larvae within their 

 branchial chambers. 



(2) A fragment of a Dipterous larva was found adhering 

 to the external surface of an example of the same species 

 from Christmas Island, near to the lateral opening of the 

 gill-chamber. 



(3) Two small Dipterous larvas were found in the branchial 

 chamber of one of three specimens of a land-crab — 

 Gecarcoidea lalandii — from Christmas Island (collected by 

 Dr. R. Kirkpatrick). 



* Baylis, H. A. (19]5). "A parasitic C'ligocliaita and other Tuli;ibi- 

 tiints of the Gill-cbamber of Laud-crabs," Anu. & Mag. Nat. lljst. 

 ser. 8, vol. xv . pp. 378-383. 



Ann. (& Mug. N. Hist. !Scr. 9. Vol viii. 39 



