96 gibbons: on RHYTIDA CAFFRA. 



tentacles, being connected to the ocular by a branch; in front of 

 shell the surface is strongly granuloso-striate in an anteriorly 

 oblique direction; behind the striae run the reverse way; three 

 close sulcse separated by rounded granular ridges pass from the 

 collar to the head along the middle ; ocular tentacles long and 

 spreading, conical; oral, cylindrical and directed horizontally 

 forwards, labial pair, short, thick, conico-triangular — angulate on 

 the outer side, protruding almost directly outwards, or at right 

 angles to the oral pair — all the tentacles are dark greyish-brown, 

 finely, but distinctly granulate. 



Collected at Port Natal and Port Elizabeth. Not a common 

 species at either place and almost invariably dead. It is said to 

 burrow in the sandy soil during dry weather, and on the rare 

 occasions when it has been taken alive, to have usually occurred on 

 or near animal matter. 



I kept a live specimen in a tumbler for some little time in 

 order to observe the animal, and afterwards for a month or two 

 in a dry box ; it made no attempt to attach the aperture of the 

 shell to anything or to close'it with an epiphragm. The labial 

 tentacles are employed as feelers, being constantly applied to the 

 surface on which the animal walks. They are protruded and 

 withdrawn with ^great celerity and while the animal is in motion 

 are never still for a moment. The oral pair on the contrary being 

 kept steadily pointed forwards. When the animal reached the 

 top of the tumbler, and the front half of the body was free, 

 these tentacles would be protruded to their full extent and curved 

 downwards in search of something on which to continue the 

 journey. When fully extended it is seen that the oral and labial 

 tentacles arise close together but not from a common base. 



I fed my specimen on boiled potatoe, which it ate with ap- 

 parent relish. Previously it had taken the anterior end of a small 

 living En/iea into its mouth, and retained it there until I re- 

 moved it. 



