NEMERTEANS 



229 



Lineus geniculates (Chiaje, 1828) (Fig. 5). 



Two specimens (N 69) were taken at St. 283 off Annobon in the Gulf of Guinea 

 This was in August 1927. They were practically identical 

 in size: length 27-5 cm.; breadth 0-55 cm.; thickness 

 0-15 cm. 



Form and colour of preserved specimens. The body is very 

 flattened, the head blunt in outline from above and the tail 

 pointed. The mouth is a longitudinal slit 7 mm. long 



(Fig. 5)- 



The colour is brownish dorsally and ventrally with com- 

 plete white annulations — fifty-three in one specimen, fifty- 

 six in the other. I could find no trace of longitudinal 

 markings and no sign of eyes : but of the latter eighty-eight 

 were afterwards counted in the sections embedded in the 

 tissue of the head at the edges of the cephalic slits. They 

 were most numerous at the tip of the head but occurred as 

 far back as the brain. 



The head glands stain markedly with haematoxylin. They A B 



are scattered in two symmetrical areas on each side of the Fig. 5. Lineus geniculatus 

 rhynchocoel, passing away on each side above and below (Chiaje). A, dorsal; B, ventral 

 the cephalic slits. They disappear from the sections before surface of the P reserved s P ed " 



men x 1 

 the brain appears. The cephalic organs are somewhat small. 



A full description of this species is given by Burger (1895), and to this the specimens 



from Annobon exactly conform. 



Lineus ruber (O. F. Muller), 1771 (Plate XV, fig. 4; Fig. 6). 



Twenty-three specimens were taken between July and September from the shore be- 

 tween tide-marks. Most of the worms were found near the whaling stations under 

 stones on the mud, but some occurred in kelp roots from rocks on the shore outside the 

 Bay. The largest worm was 14-0 cm. long, with a breadth of i-o mm. ; the smallest was 

 5-0 cm. long, breadth 0-5 mm. 



Form and colour in life. The body is round and tapers gradually at the tail. The head 

 is rather flat and broader than the succeeding part of the body. The snout is broad and 

 mobile. The cephalic slits are long and pale. The mouth is a small elongated slit with 

 pale lips far back on the ventral surface of the head. The colour in life is brown, deepest 

 anteriorly. The tail is very pale. Behind the head both dorsally and ventrally there is 

 a large undefined reddish mark. A series of pale rings is visible on the body in some 

 specimens. In an 11 cm. worm seventeen were counted. The tip of the snout is pale. 

 The eyes are variable, but not more than ten were found on each side. Usually there 

 were five in a line at the edge of the pigment. 



In one specimen there was a row of minute pores showing pale on each side of the 

 body nearer the dorsal than the ventral side. The row, marking the openings of the 



