464 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



of the dorsal surface. The anterior eyes were crescentic 

 in shape and twice the size of the more rounded posterior 

 pair. 



The central stylet apparatus was very large, the stylet 

 somewhat longer than was the case in the two typical 

 specimens of T. rohertiancB, and the handle very long, its 

 posterior border straight with rounded corners. 



Prosorlioclunus claparedii, Keferstein. 



The Nemertine referred here was met with not un- 

 commonly among material dredged on the shell ground 

 lying to the north of the Halfway Eock in 15 to 20 fathoms. 

 There can be little doubt that it is identical with the 

 Plymouth form described by Eiches under this name, 

 though I failed to make out a superior lobe on the head. 

 Both differ very considerably in general appearance from 

 the figares oi Prosorlwchmiis claparedii given by M'Intosh, 

 and ought very possibly to be regarded as a distinct species. 



In the Port Erin specimens, which were from 8 to 12 

 mm. long, the body was stout and rounded, tapering from 

 the middle towards either end. The head broad, rounded 

 in outline and with pronounced notch in front, very 

 convex dorsally, and well marked off by conspicuous 

 cephalic furrows resembling those of Tetrastemma can- 

 didum in disposition. The colour was a dull brownish 

 orange resulting from the deep apricot yellow colour of 

 the alimentary tract modified by a sprinkling of minute 

 granules of superficial reddish brown pigment all over 

 the body but much more plentiful on the dorsal surface. 

 In one or two specimens there was a slightly greater 

 development of pigment between the anterior and posterior 

 cephalic grooves, but to nothing like the extent seen in 

 the Plymouth form. The greater portion of the dorsal 

 surface of the head in front of the anterior furrows was 

 covered with opaque white flakes ; similar flakes were 



