MancJiester Memoirs, Vol. xlv. (1901) No. 13. 3 



GONIAD.^:. 



Goniada norvcgica Orsted, var. falklandica. Arvvidsson 

 ('99), p. 38. (New variety). 



A single mature specimen, with ova, consisting of 

 about 182 segments, found living in a hollow root of 

 Macrocystts taken at a depth of 3 fathoms. The tail end 

 missing in the preserved state. 



Length about 180 mm.; without proboscis, 140 mm. 

 Breadth at the widest part, including parapodia, lo-ii 

 mm. The breadth is greatest in the middle of the body, 

 mainly due to the increase in size and development of the 

 parapodia in this part of the body. 



Colour. The specimen was well preserved in formalin ; 

 dorsal surface, greenish-brown ; ventral surface, brownish. 

 The whole surface of the body, including proboscis, 

 covered with a thin transparent cuticle having an 

 iridescent metallic lustre. In these respects it closely 

 resembles the Norwegian species. 



As this affords a good example of the same species 

 occurring in the north and south temperate regions but not 

 in the tropics, I have given a detailed examination of the 

 form. Through the kindness of Dr. Appellof, of Bergen, 

 I have been able to examine specimens of the species 

 from Norway, and to compare them with the specimen 

 from the Falkland Islands. It was important that an 

 actual comparison of these forms should be made, for, in 

 the discussions on the Bipolar Theory, there has been an 

 uncertainty (due to the vagueness of the published accounts 

 of species) as to the degree of resemblance between extra- 

 tropical forms, and it was doubtful whether some should 

 be classed as varieties or as individual species. 



Prostomiuin. Conical, nearly twice as long as broad, 

 with 9 segments, the basal one being the largest ; at the 

 tip are 4 small tentacles. In form the prostomium closely 



