56 Dr. Johnston's Contributions to the British Fau7ia. 



1. Plan, octoculata. 



Plan, mollis, linearis, castanea, antice oculis octo, maculaque rubra. 



Hab. In littore sub lapidibus. 



Desc. Bodij 1 — 2i inches long, slender, soft, flattened, contrac" 

 tile, chesnut-brown above, whitish on the ventral surface. Mouth and 

 onrw terminal ; no proboscis; intestine straight. Eijes 8, four placed in 

 a line on each side of the head ; and a little behind them is a reddish spot 

 on the back. The body in some individuals appears tilled with numerous 

 whitish egg-like bodies, which are probably the ova of the animal. 



2. Plan, quadrioculata. 

 Plan, mollis, linearis, flava; oculis quatuor, remotis. 



Hah. In littore sub lapidibus. 



Desc. Body 1^ inch long, soft, flattened, contractile, narrowed 

 towards the tail, of a yellowish maculated colour with a dirty greenish in- 

 testinal line down the middle. Mouth rounded. Eyes 4, placed in a 

 square form, and rather distant. 



Ohs. The maculated appearance proceeds from white oviform bodies. 



3. Plan, bioculata. 



Plan, linearis, mollis, olivacea ; oculis duobus. 



Hah. Ad radices confervarum. 



Desc. Body 4 — 6 inches long, slender, soft, compressed, narrowed 

 towards the tail, of an uniform dull green or bottle-green colour, with 

 paler longitudinal and transverse striae, and sometimes irregularly marked 

 with a few whitish dots. Head somewhat truncate, with two lateral rather 

 prominent black eyes. About two lines behind the oral extremity there 

 is in most a dark red spot. 



4. Plan, filiformis. 



Plan, albida, gracilis, imicolor, sine oculis, maculisve. 



Hah. Ad littora sub lapidibus. 



Desc. Body slender, filiform, soft, very contractile, and capable of 

 being extended to the length of 6 inches, when it appears like a sevdng 

 thread, of an uniform whitish or yellowish- white colour. Mouth and 



