284 EVENINGS AT THE MICROSCOPE 



the last example, a red of great intensity. When the head 

 is withdrawn, the integument is very clearly seen to be in- 

 troverted. The body consists of one long cylindrical tube, 

 which receives three or four short joints to complete the 

 abdomen; at the dorsal aspect of the extremity of the last 

 of these is the cloaca ; at this point the diameter is already 

 very much attenuated; but there are eight or nine more 

 joints which constitute the foot, and these are of extreme 

 slenderness. Toward the extremity, two processes are 

 given off behind, each consisting of a club-shaped piece, 

 with a slender bristle at the tip. The foot terminates 

 in three long, slender, cylindrical divergent toes, which 

 are flexible, and commonly bent outward; they are equal 

 in thickness, and truncate. These are often retracted in 

 various degrees, even when the foot is otherwise ex- 

 tended. 



Owing to the slenderness of the body, the viscera are 

 greatly elongated. The mastax, as usual in this family, 

 consists of two hemispheres (each bearing two teeth, set 

 transversely, but converging to the centre); it is situated 

 at a considerable distance from the wheels, and is reached 

 by a long buccal funnel. The digestive canal is a long sac, 

 apparently undivided; it originates directly from the mas- 

 tax, with, I think, two small basal glands; its posterior 

 extremity becomes gradually tapered to the cloaca. In the 

 specimen we are examining, a small quantity of fecal matter 

 of a yellowish-brown color is collected in two small masses, 

 near the extremity. Along the ventral aspect runs the 

 ovary, which in this specimen contains two long oval eggs 

 in advanced development; from their transparent bright- 

 ness, I suspect the young are produced before birth. I 

 think I can detect a contractile bladder, but am not certain. 



