4.64 DR. W. G. RIDEWOOD ON A 
The third appendages (mandibles) are greatly reduced, being 
represented only by their basal segment, which extends inwards 
and downwards and fuses with the sides of the oral cone. 
Obesiella lyonsielle.—From the left side and from below. x 38. 
In the lower figure the cephalic appendages are represented as cut off short. 
The fourth appendages (maxille) are very small. The inner 
ramus is a flexible palp, and is terminated by two or three sete; 
the outer has the form of a shallow eminence rising from the 
end of the ridge which represents the basal portion of the 
appendage. This is the only cephalic appendage in which any 
trace of the outer ramus is discernible. 
