ON ARCTIC TARDIGRADA. 



671 



With these additions there were, according to Richters' summary in Fauna Arctica 

 (12), 19 species of Tardigrada recorded for Spitsbergen. 



In Mr Bruce's collections I have found 22 species. As 12 of these have not 

 been previously recorded for Spitsbergen, the list of species now numbers 31. 

 Two of the species are new to science, and 7 are species recently discovered 

 in Scotland. 



A curious feature in all Mr Bruce's collections from Spitsbergen is the scarcity of 

 animals of the genus Echiniscus and the abundance of species of Macrobiotus. Only 2 

 species of Echiniscus were found, and 15 of Macrobiotus. This is the more remarkable 

 as there were already 6 species recorded for Spitsbergen, and in Mr Bruce's collections 

 from Franz Josef Land there were also 6 species of Echiniscus. There were 5 species 

 of Diphascon observed. 



List of Spitsbergen Species (Bruce Collection). 





Prince 

 Charles 



Recherche 



Red Bay. 





Foreland. 



Bay. 





Echiniscus arctomijs, Ehr. 







X 



E. mutabilis, Murray 







X 







Macrobiotus oberhduseri, Doy. 







X 







M. zet/andicus, Murray . 







X 







M. ornafus, Richters 











X 



M. tuberculatus, Plate 







X 







M. tetradactylus, Greeff . 







X 







M. hufelandii, C. Sch. . 







X 



X 





M. intermedins, Plate 







X 







M. ec?iinogenitus, Richters 







X 







var. areolatus, var. nov. 











X 



M. dispar, Murray . 







X 







M. ambiguus, Murray 







X 







M. crenulatus, Richters . 







X 







M. harmsworthi, sp. n. . 







X 







M. arcticus, sp. n. . 







X 







M. is/andicus, Richters'? . 







X 



X 





M. pullari, Murray 







X 







Diphascon chilenense, Plate 







X 







D. alpinum, Murray 







X 







D. spitsbergense, Richters 







X 







D. scoticum, Murray 







X 



X 





D. angustatum, Murray . 









X 





Franz Josef Land. 



The collections from Franz Josef Land were more numerous than those from 

 the other Arctic lands visited by Mr Bruce, and represented a greater variety of 

 situation, from ponds nearly at sea-level to moss growing on an old walrus skull 

 found on a raised beach some 400 feet above sea-level. 



