APPENDIX C. 



555 



It was some time before I succeeded in meeting with an 

 example, but Mr. W. A. Tulloch, when stationed at Ailsa Craig 

 lighthouse, secured several, and Montagu seems to have found 

 it in every Gannet which he dissected. 



Montagu describes it as " ovate-oblong, smooth, glossy, white, 

 with eight short legs furnished with several joints and 

 terminated by bristles ; two on each side approximating and 

 near to the anterior end ; the others similarly disposed about 



one-third of its length from the posterior-end ; of the posterior 

 legs the hindmost pair is furnished with a very long bristle, the 

 other pair usually with two ; the anterior legs possess several 

 bristles each." The mouth was not discernible, nor the eyes, 

 nor any other appendages. A copy of his figure is here given, 

 showing the under (1), upper (2), and side view (3), all greatly 

 magnified. 



Under the title of " What is the Cellularia bassani of Mon- 

 tagu ? " Mr. W. Evans has a short article on this Acarid in 

 "The Scottish Naturahst " (1912, p. 68), in which he points 

 out that the name Cellularia is inadmissible, being pre-occupied 

 in marine Polyzoa. " An organism," continues Mr. Evans, 

 " very similar to Montagu's, known as Hypoderas, or Hypo- 

 dectes columhce, from the domestic pigeon, has been studied 

 by C. Robertson ('Quart. Journ. Mier. Soe.,' 1800, ]). 201), 



