

368 TRANSACTIONS LIVBEPOOL BIOLOGICAL SOCIETY. 



of T. melanocephalum was observed, which resembled a 

 specimen described by Riches in having the dark pigment 

 patch broken into two by a space in the middle line free 

 from pigment, and thus connecting the present species 

 with T. vermiculatum. 



Tetrastemma robertiance, M'Intosh. 

 Two specimens of this rare species were dredged in 

 1895 on the shelly ground off Port Erin in about 15 

 fathoms. Lochmaddy and Bressay Sound where it was 

 dredged by M'Intosh appear to be the only other localities 

 where it has been found. 



The two examples observed by myself agreed fairly well 

 with M'Intosh' s figures and description, though in neither 

 was the head so pointed as he represents it in the woodcut 

 on page 167 of the Monograph. The central stylet 

 apparatus did not differ materially from his figure (p. 65). 

 The larger individual, about 1 cm. long, had the median 

 dorsal white line, the reddish brown lateral stripes and 

 collar, the latter not quite encircling the neck ventrally. 

 There was a patch of opaque white flakes between and in 

 front of the posterior eyes which were much smaller than 

 the anterior pair. The smaller one was similar except 

 that the brown collar was wanting. 



A Nemertine from the same locality resembling the 

 above in shape but differing somewhat in arrangement of 

 colour and also in the character of its stylet apparatus 

 may be conveniently described here. Like them it was 

 exceedingly active. It measured about 8 mm. in length. 

 The ground colour was apricot-yellow, a large patch of 

 opaque white flakes extended across the dorsal surface of 

 the head between the anterior and posterior eyes, a little 

 behind the latter was a chocolate brown collar not quite 

 complete ventrally, and from this a median longitudinal 

 band of the same colour extended back the whole length 



