NEMRRTEANS 



247 



PART II. NEMERTEANS FROM THE FALKLAND ISLANDS, 

 SOUTH GEORGIA AND THE ISLANDS AND BANKS 

 OF THE WESTERN SOUTH ATLANTIC OCEAN 



Of the twenty-five species here described only the littoral forms from South Georgia 

 and the Falklands were sketched in life. The remainder were taken in nets at sea and 

 only occasional colour notes were made. Twelve species had been previously described 

 and six of these are here figured for the first time in colour. The South Georgia speci- 

 mens were mainly collected from the roots of kelp off the Point, King Edward Cove, 

 close to the whaling station of the Cia Argentina de Pesca. The water here was from 

 4 to 6 m. deep and the bottom was very muddy and greasy from the years of whaling 

 activity at the head of the cove. Throughout the area Linens corrugatus, Mcintosh, was 

 by far the most common species. 



On the Burdwood Bank, off the Falklands, South Shetlands and South Orkneys, 

 specimens were brought up by the ships while dredging or trawling. The deepest cap- 

 ture was Amp/iiporus lecointei, Burger, from 401 m. at St. 158. 



No representatives of the Paleonemertea were taken. The Hoplonemertea and the 

 Heteronemertea are strongly represented, the former by nine species each of Tetra- 

 stemma and Amphiporns , the latter by one or more species of the genera Baseodiscus, 

 Parapolia, Linens and Cerebratulns . 



Order HETERONEMERTEA 

 Genus Baseodiscus, Diesing 



Baseodiscus antarcticus, Baylis, 1915 (Figs. 19, 20). 



One specimen (N 59) was taken at St. 182 in 278-500 m. No record exists of its 

 appearance in life. Two large specimens taken at St. WS 73 were found among the 

 collection and identified with the previous specimen. These 

 were accompanied by a note: " Larger specimen 28 cm. long 

 and 0-5 cm. wide. Both of a pinkish colour, deeper along the 

 mid-dorsal and mid-ventral lines". The specimen from 

 St. 182 is a small nearly cylindrical worm, blunt at both 

 ends, 25 mm. long and 2 mm. in diameter. The colour is very 

 pale brown with no trace of markings. The larger specimen 

 from St. WS 73 is 300 mm. long and 6-5 mm. wide, the 

 smaller 130 mm. long and 3-5 mm. wide. Both are pale 

 yellow-brown with no markings. 



The following notes may be added to the description given preserved specimen, ventral 



bv Bavlis (iQicV surface, to show the annular 



mi ij- r^iri^ 1 1,,^, furrow and the mouth (m). 



ihe body is soft and flattened except at the head. Both 



head and tail are blunt ; in fact, when the worms have been preserved it is difficult to 



identify the head, it resembles so much a broken end of the body. The back is very 



Fig. 19. Baseodiscus ant- 

 arcticus, Baylis. Head of 



