542 PYCNOGONIDA 



CHAl'. XXI 



with, Sars' P. producta, a species that scarcely differs from P. hrevirostris, 

 save in its greater attenuation ; the same species has also been recorded from 

 Millport and from Port Erin. 



P. spectrum, Dohrn : Plymouth (A. H. Norman). 



Besides the above, all of which are littoral or more or less 

 shallow- water species, we have another series of forms, or, to 

 speak more correctly, we have two other series of forms, from the 

 deep Atlantic waters within the British area. In the cold area 

 of the Faeroe Channel we have Boreonymiihon rohishim, Bell ; 

 Nymplion elegans, Hansen ; N. slniteri, Hoek ; N. stenocheir, 

 Norman ; Colossendeis j^rohoscidea, Sal)ine ; C. angusta, Sars. In 

 the warm waters south and west of the Wyville-Thomson ridge 

 we have Chaetoni/mjjhon spinosissimum, Norman ; Nymphon 

 gracilipes, Heller (non Fabr.) ; K hirtipes, Hell; N. longitarse, 

 Kr. ; N. macrum, Wilson ; Pallenop)sis tritonis, Hoek { = P. holti, 

 Carpenter) ; 'Anojjlodactylus oculatus, Carpenter, and A. typldops, 

 G. 0. Sars; and to the list under this section Canon Norman 

 has lately made the very interesting addition of Paranympilion 

 splnosum, Caullery, from the Porcupine Station XVII., S.S.E. of 

 Eockall, in 1230 fathoms. Lastly, and less clearly related to 

 temperature, we have Chaetonymplion tcnellum, Sars ; N. gracili2^es, 

 Fabr.; Klejitocheles, Sars; N.in(fC7'onyx,Siivs; K serratum, Suvs; 

 and Cordylochele malleolata, Sars. 



Of the species recorded in the above list as a whole, Anoplo- 

 dactylus virescens, Nymphon gracile, and Pallene spectrum reach 

 their northern limit in the southern parts of our own area ; 

 Ammothea echinata, Ano'p)lodactylus 'petiolcttus, Pallene Irevirostrifi, 

 and Phoxichilus spinosus (or very closely related forms) range from 

 the Mediterranean to Norway, the last three also to the other 

 side of the Atlantic ; JVymphon hrevirostre and N. ruhruni range 

 from Britain, where they are in the main East Coast species, to 

 Norway. Of the Atlantic species, other than the Arctic ones, 

 the majority are known to extend to the New England coast. 



