256 DISCOVERY REPORTS 



long. The tip of the head was brown and the anterior end of the body was of a more 

 crimson tint than the body farther back. 



Anatomically the worm is very closely allied to L. corrugatus. The "eyes" are not 

 present, however, and the mouth is very small. 



Genus Cerebratulus, Renier 



Cerebratulus larseni, n.sp. (Plate XVI, fig. 8; Fig. 28). 



One specimen, somewhat damaged at the posterior end, was taken at St. 140 in 122- 

 136 m. The length was 2-3 cm., breadth 0-14 cm. 



The body is round in section but the head is flat. In outline from above it takes the 

 form of an elongated lozenge. The mouth is a small longitudinal slit with swollen lips 

 just behind the pinkish blotch on the head. The 

 colour is pale yellow with a bright pink vague 

 patch on the head and a pink line showing 

 down each side of the body. A caudal ap- 

 pendage is present. 



In spirit the specimen had broken up. The 

 colour was bleached. 



The head is rectangular in the early sections. 

 The vascular and nervous systems conform to 

 type but the upper branch of the dorsal ganglion Fig . 2 g. Cerebratulus larseni, n.sp. Tr 



is Stout and short. It is separated at its distal sectionof the head in the posterior brain region, 

 end from the rest of the ganglion (Fig. 28). cc > cerebral canal ;dg, dorsal ganglion ; «/>, upper 



m, , • j- 1 11 r a -l j branch of the dorsal ganglion; vp, ventral 



lhe longitudinal muscle layer or the body is ,. " b 



.... ganglion. 



strongly developed. The cutis is thin in com- 

 parison with the same layer in Linens corrugatus. The basement layer is as thick as the 

 subepithelial muscle layer. 



I have named this species after Captain C. A. Larsen, the pioneer of whaling in the 

 South Atlantic. 



Cerebratulus malvini, n.sp. (Figs. 29, 30). 



Certain of the Heteronemerteans from the area around the Falkland Islands possessed 

 a caudal appendage. These worms were not sketched or noted in life so that the colour 

 remains unknown. As far as one can judge from specimens in alcohol (N 52, N 65, N 72, 

 N 97, N 100) the colour is very dark brown, darker on the back than the underside. 

 No trace of markings remain. The lengths and breadths of four specimens are as follows: 

 36-0, 3-5 mm.; n-o, i-o mm.; 55-0, 2-0 mm.; 45-0, 3-5 mm. 



The cephalic slits are long and the mouth is very small. In one specimen (N 52) the 

 caudal appendage was double (Fig. 29B). Apart from the absence of "eyes" there 

 appears to be no feature by which one can distinguish the sections of these worms from 



ransverse 



