D. BEYCE ON A NEW SPECIES OF METOPIDIA. 285 



whilst a suggestion of the pinching in remains in a faint sinua- 

 tion of the lateral margins. The ventral plate, which is 

 excavate anteriorly in a moderate curve, appears almost 

 membranous behind, and I could with much difficulty distin- 

 guish lines marking a wedge-shaped foot orifice. The creature 

 possesses the usual hyaline somewhat pointed hood, and to 

 right and to left of its base I could see the opaque particles 

 frequently -pT^esent in Metopidice, and below these, again, the two 

 pale red eyes. The mastax and the internal organs were fairly 

 distinct, but with one exception suggested no remarks. The 

 contractile vesicle was unusually large and extended like a 

 narrow sac from side to side, just above the base of the foot, 

 being best seen from the ventral side. 



Length -gi^ inch, extended. 



Habitat Epping Forest. 



