432 G. WYNHOFF. 



Geographical distribution : All coasts of the Northern part of the 

 Atlantic, including the Channel, the North Sea and the Baltic, North 

 America, Madeira, and the Mediterranean. 



8. Prostoma flavidum {Ehrhg.). (Burger. Monogr. Taf. Ill, Fig. 20.) 

 Locality : From Queen's and New Grounds, Cattewater and Eame- 



Eddystone in dredgings ; between tidemarks at Eum Bay. 



This species includes one of the most common Nemerteans of Ply- 

 mouth Sound. The colour is a pale yellow or reddish tint, which may 

 even be quite pink, as in a specimen dredged from the Eame-Eddy stone 

 Grounds. It can be distinguished from P. candidum by the colour and 

 by the total absence of any pigment on the head. The reddish and 

 yellow variety of P. caoididum, Riches, probably belongs to this species, 

 which is not synonymous with T. Jiavidum of Mcintosh, Eiches, and 

 Beaumont. Length 12 mm., breadth J-1 mm. 



Geographical distribution : Sweden, Belgium, coasts of France, 

 Madeira, Mediterranean, and Eed Sea. 



9. Prostoma cephalophorum {Bilrg.). (Biirger. Monogr. Taf. Ill, 

 Fig. 22.) 



Locality: A few Nemertines belonging to this species have been 

 found in dredgings from New Grounds and the Bridge, Asia Shoal, 

 and Queen's Grounds. 



Head rhomboid, broader than the body, sharply separated from it, 

 with four rather large eyes. No markings. Tiie general colour is 

 brown ; the head and the margins of the body, however, are less 

 darkly coloured. My specimens agree fully with the description given 

 by Beaumont (1900). 



Geographical distribution : Ireland, Isle of Man, coast of Cornwall 

 and Naples. 



10. Prostoma ambiguum, Bidies. 



Locality : Common at all dredging and trawling grounds in the 

 Sound, in the neighbourhood of the Mew^stone, and on the Eame- 

 Eddystone Grounds, at a depth of 25-30 fathoms. 



My specimens perfectly resemble those described by Eiches. 

 Length 10-15 mm., breadth 1 mm. Four brown eyes, the anterior 

 pair of which is at least twice as large as the posterior. Colour pale 

 yellow, with a reddish brown pigment developed on the dorsum. Head 

 broadened and separated from the body. 



Geographical distribution : Plymouth. 



11. Prostoma helvolum {BUrg.). (Burger. Monogr. Taf. Ill, 

 Fig. 16.) 



