232 



G. A. aud W. G. MacCallum, 



plied with muscle and the cbitiiious skeleton is imbedded in it pro- 

 jecting anterioiiy and at the jimction of the handles in the form 

 of Short teeth which are quite detinite here although their existence 

 seemed questionable in M. macroura. They measure 0,11 X 

 0,05 mm. 



Sections of the unstalked suckers present the same form with 

 projecting teeth, although it is extremely difflcult to understand 

 why no evidence of these teeth appears when the apparatus is ex- 

 amined while lying flat. The appearance when viewed as they lie, 

 is shown in another flgure (Fig. Bb). It is seen that the skeleton 

 is reduced to marginal ribs, the meridional sternum like rod is no 

 longer complete but exists in the form of two separate rods. Further, 

 one half of the sucker is provided with two sharply triangulär 

 chitinous elements which seem rather independent of any close con- 

 nection with the rest. They measure 0,05—0,08 mm in diameter. 



