PLYMOUTH NEMERTEANS. 415 



1. "P.la.ca.zeUJouhiii. (Joubin. LesNemertiens. PI. I, Fig. 15 et 16.) 



Locality : One specimen from the Eddystone. 



On the 26th of May I got this single specimen, together with Tubulanus 

 superhus and T. 2)olymor])hus, from the Eddystone Grounds. As the 

 position of the eyes, the bright pink colour and the two cephalic slits 

 agreed perfectly with Joubin's description, I did not hesitate to 

 identify my specimen as P. lacazci. The internal structure proved the 

 correctness of this identification. 



Geographical distribution: Joubin found this species at Banyuls, 

 Biirger at Mauritius, Hallez near Calais. 



II. Fam. LINEIDAE. 

 Usually with a pair of deep horizontal cephalic furrows. Proboscis 

 with three muscular coats and mostly with two muscular crosses. 

 Cephalic gland consisting of very slender tubes, situated anterior to the 

 brain. 



Sub-Family A. LINEINAE. 

 Without caudal cirrus. Proboscis sheath usually much shorter than 

 the body. 



Genus Linens. 

 Body rounded or flattened, unusually long, very contractile. Head 

 mostly somewhat broadened and spathulate. The worms are not able 

 to swim ; as a rule they coil themselves up and make knots. Ocelli 

 present in most species. Proboscis sheath short. 



1. Lineus longissimus (Gunn.) (Mcintosh. Monogr. PI, IX.) 

 Locality : Bather common in dredgings from the Sound, Mewstone, 



and the Yealm. 



The colour is a blackish brown relieved throughout by the fine 

 purplish " iridescence of the cilia." With darker and lighter stripes 

 on the head and part of the body. Eyes numerous, arranged in a 

 marginal row on each side of the head, which is somewhat broadened 

 and spathulate, not separated from the body. 



Geographical distribution : Atlantic and Baltic coasts of Europe. 



2. Lineus bilineatus {Ben.). (Joubin. Les Nemertiens, PI. II, Fig. 

 26 et 27.) 



Locality : Very common, especially in dredgings from the Sound ; 

 from the Bame-Eddystone Grounds, the Mewstone neighbourhood, but 

 also from the Cattewater and between tidemarks at the Yealm and 

 Bum Bay. 



Colour a pale brown, sometimes with a reddish shade, or nearly 

 white. With a pair of longitudinal white streaks, passing on from the 



