22 8 DISCOVERY REPORTS 



brane and the muscles, and it has been traced forwards for some distance into the head. 

 The lateral nerve stems are united by frequent commissural strands. From the trans- 

 verse furrows between head and body the cerebral canals pass in on each side directly 

 towards the brain. At the basement membrane ^ 



they meet and become embedded within a nerve 

 from the dorsal ganglion (Fig. 4). The canal just 

 penetrates the basement membrane but cannot be 

 traced farther. 



These worms have been identified with Tubu- 

 lamis nothus, described by Burger from the 

 Mediterranean, from the form of the head, colour 

 of the body and the arrangement of white rings, 

 the pigmented patches of eyespecks, the side 

 organs, and some anatomical features such as the p . g ^ Tubulanus )l0thlis> Biirger . Section 

 thickness of the epithelium and the position of showing the cerebral canal entering the 

 the nephridial canals. The penetration of the nerve from the dorsal ganglion, e, epi- 



cerebral canals beyond the basement membrane thelium ; cc > cerebral canal; #. dorsal 



, . . .- T „ , ,. ganglion; Im, longitudinal muscles; vg, ven- 



is not considered of significance. In 1 . banyulensis, * ral lion 



whose anatomy according to Burger (1895) is 



similar to that of T. nothus, the cerebral organ is a finger-like pit which reaches 



the basement membrane and is innervated from the posterior angle of the dorsal 



ganglion (loc. cit., p. 526). 



It is curious that T. annulatus was not taken at Saldanha Bay, for it was described by 

 Stimpson (1856) from Simon's Bay near Cape Town. 



Order HETERONEMERTEA 

 Genus Lineus, Sowerby 



Lineus bilineatus, Renier, 1804 (Plate XV, fig. 10). 



One specimen of this characteristically marked species was taken in August from a 

 kelp root attached to a granite boulder on the outer shore near Eland Point — the end of 

 the southern arm of the bay. The length was between 15 and 20 cm., but the specimen 

 was damaged. The breadth of the head was o-6 mm. Eggs were present. 



Form and colour in life. The body is soft, somewhat flattened and slim. The head is not 

 distinctly marked off from the body ; it is flat, obtusely pointed and wider at half length 

 than the anterior part of the body. The tip is slightly notched. No eyes are visible. 



The colour is light brown with a double white line down the back from the tip of the 

 head to the tip of the tail. 



Form and colour of preserved specimen. In spirit the worm is white and no trace can be 

 seen of the white lines. The cephalic slits are very long. The mouth is a small round 

 aperture opposite the posterior ends of the cephalic slits. 



No eyes could be seen after clearing in anilin oil. 



