Manchester Memoirs, Vol. xlv. (1901), A^^. 14. n 



Nephthys longisetosa, Orsted ; Notoviastus latertceus, Sars ; 

 Scolecolepis vulgaris, Johnst. One, Glycera americana, 

 Leidy.occurs on the east coast of North and South America. 

 Five are common to north and south extra-tropical 

 Atlantic, but have not been taken in the Pacific : Syllides 

 longocirratiis, Orsted ; ChcBtopterns variopedatus, Ren. ; 

 Capitella capitata, Fabr. ; Terebellides strbinii, S. ; Scrpula 

 vennicidaris, L. (to 175 faths.). In addition to these 

 species, there are three southern species which are very 

 closely related to three northern species: (i) A new 

 species of Arenicola {A. assiviilis) from the Straits of 

 Magellan, which Ehlers believes to be identical with a 

 form taken on the Californian coast. It is very probable 

 that A. assimilis will prove to be a variety of ^. marina 

 or A. claparcdii, both of which are European forms. The 

 remarks on the distribution of .4. claparedii (p. 15) would 

 then also apply to this form. (2) Travisia kerguelensis, 

 M'lntosh. This form closely resembles, if it is not entirely 

 identical with, the European T. forbesi. (3) Scoloplos 

 kerguelensis, M'lntosh. Ehlers states that this is clearly 

 very nearly related to 5. arnnger. 



In describing a collection of forms from the Falkland 

 Islands, Pratt ('98) notes four extra-tropical species :— 



(Polyzoa) Beania magellanica ; Cellepora pustulata. 

 (Porifera) Sycon ciliata. (Crustacea) Orchestia chilensis. 



(Gephyrea) Phascolosoma capsi/onne has since been 

 shown to be a variety of the northern P. inargaritaceum, 

 var. capsiforme. 



(Polycha^ta) Lagisca magellanica has been shown to 

 be a synonym of Harmothoe spinosa, which appears to 

 differ from the northern H. imhricata ox\\\ in the position 

 of the eyes. 



I have shown that, in addition to Pfeffer and Murray, 

 the following writers have noted the similarity between 



