646 



MR JAMES MURRAY ON 



In compiling this I am mainly indebted to Richters' " Arktische Tardigraden " (19) 

 and subsequent papers, and to Lance's " Contribution a l'etude " (4). The distribution 

 is given under three heads — Britain ; Polar Regions ; other Regions. The Tardigrade 

 fauna of the Polar Regions has received as much attention as that of any part of the 

 world, except perhaps Germany. Under the heading "Britain" the Orkneys and 

 Shetlands are treated separately from Scotland, as they form important links with the 

 Arctic Region. 



The polar regions are not denned as strictly limited by the polar circles, but include 

 Iceland in the Arctic, and all lands south of the great continents in the Antarctic. 



Distribution in Scotland. 



ECHINISCUS. 



A. Segment V distinct from VI, 

 paired or single. 



1. E. arctomys, Ehr. Perth, Inverness, Orkney, 



Shetland, Edinburgh. 



2. E. mutabilis, Murray. Perth, Inverness, Edin- 



burgh, Orkney, Shetland, St Kilda. 



3. E. islandicus, Richters. Ronas Hill, Shetland. 



B. Segments V and VI fused into one plate. 



4. E. gladiator, Murray. Perth, Inverness. 



var. exarmatus, var. nov. Ronas Hill, 



Shetland. 



5. E. wendti, Richters. Perth, Inverness, Edin- 



burgh. 



6. E. reticulatus, Murray. Perth, Inverness. 



7. E. oiho7inse, Richters. Perth, Inverness. 



8. E. granulatus, Doy.? Perth, Inverness, Shet- 



land, Edinburgh. 



9. E. spitsbergensis, Scourfield. Perth, Inverness, 



Edinburgh. 



10. E. quadrispinosus, Richters 1 



var. cribrosus, var. nov. Perth, Inver- 

 ness, Lanark, Shetland. 

 var. ftssispinosus, var. nov. Peebles, 



Inverness. 



11. E. muscicola, Plate ? Perth. 



Milnesium. 



12. M. tardigradum, Doy. Perth, Inverness, 



Edinburgh, Orkney, Shetland. 



Macrobiotus. 

 A. Eggs smooth, laid in the cast skin. 



13. M. oberhduseri, Doy.? Inverness, Orkney, 



Perth. 



14. M. ornahis, Richters. Inverness, Perth. 



var. verrucosus, Richters. Inverness. 



15. M. zetlandicus, sp. n. Inverness, Shetland. 



16. M. macronyx, Duj. 1 ? All Scotch records 



doubtful. 



17. M. angusti, sp. n. Inverness. 



18. M. annulatus, Murray. Inverness. 



19. M. tuberculatus, Plate. Inverness, Shetland. 



20. M. sattleri, Richters. Perth, Orkney, Nairn. 



21. M. papillifer, Murray. Inverness, Perth. 



B. Eggs (where known) spiny, crescent 

 in front of claws. 



22. M. coronifer, Richters. Shetland. 



23. M. crenulatus, Ritchters. Orkney, Shetland. 



24. M. harmsworthi (Murray 12). Shetland. 



C. Eggs spiny, no hyaline matrix. 



25. M. hufelandi, C. Sch. Common everywhere, 



St Kilda, 



26. M. intermedius, Plate. Inverness, Edin- 



burgh. 



27. M. orcadensis, sp. n. Orkney. 



28. M. echinogenitus, Richters. Common every- 



where, 

 var. ' areolatus (Murray 12). Perth, 



Shetland. 



29. M. islandicus, Richters? All Scotch records 



doubtful. 



30. M. dispar, Murray. Lanark, Edinburgh, 



Perth, Nairn, Shetland, Uist. 



31. M. ambiguus, sp. n. Ronas Hill, Shetland, 



Inverness. 



32. M. pullari, sp. n. Renfrew, Inverness, Edin- 



burgh. 



