NEW AND RARE ROTIFERS FROM FORFARSHIRE 241 



portion of a lighter colour (devoid of the peculiar blue), lined 

 with cilia, which in all probability opens at the base or inner 

 extremity of the passage above described as the sheath of 

 the foot. Close to the same point appears to be the orifice 

 of the rather large contractile vesicle. Of the NEPHRIDIA, 

 four ciliated funnels (" vibratile tags ") on each side were seen, 

 but no " convoluted tubes " could be observed. The BRAIN 

 is large, oval, colourless, and transparent, though at the same 

 time minutely granular. The EYE, which is of moderate size 

 and brightly red, is situated (as for instance in Mastigocerca 

 carinata), on the internal lower edge of the brain. The 

 TROPHI are, compared with the animal's size, very large, and 

 are peculiar both in shape and in position. The incus is 

 forcipate, and lies, when the animal is extended, almost 

 transversely to the length of the body, the fulcrum pointing 

 in the direction of the foot. Both fulcrum and rami are long ; 

 at their junction with one another two lateral alulae present 

 themselves ; they lie in the same plane with the rami, to 

 which plane the fulcrum on the other hand is somewhat 

 inclined in the direction of the foot. From the rami, a very 

 long curved object runs towards the mouth, and can be 

 protruded therefrom. That it has something to do with the 

 malleus or mallei cannot be doubted ; but there is no sign of 

 division into uncus and manubrium, and I am even unable 

 to say whether it be single or double. It may represent a 

 single malleus, the other (small and unsymmetrical in for 

 instance the Rattulidae) being here perhaps quite absent ; 

 and the existent single one showing as a protrusible style. 

 Just over the hinder part of the brain, but some distance to 

 the right of the middle line, is placed a very minute antenna 

 bearing apparently only a single bristle. On the sides of the 

 body are the lumbar sense organs, also very minute, consisting 

 of short rounded tubercles, probably setigerous, although this 

 could not be satisfactorily determined. That on the right side 

 is placed nearer the ventral and posterior edge of the body 

 than that on the left. This unsymmetrical arrangement of 

 the three setigerous sense organs is noteworthy. The total 

 length of the animal when fully expanded is about -^\^ of 

 an inch, the breadth about o-lrr- 



o O U 



The only known species which at all resembles this is 



