ON THE TARDIGRADA OF THE SOUTH ORKNEYS. 35 



distinct. In the case of Macrobiotus which lay spiny eggs, the presence of a known 

 species is generally first indicated by the eggs. It is notable that in the S. Orkney moss 

 no single example of such unmistakable eggs as those of M. hufelandi, M. intermedius, 

 and M. echinogenitus (type) was seen. 



The South Orkneys are situated outside the Antarctic Circle, but within the ordinary 

 limits of drift ice. I have found only one record of a Tardigrada from within the Antarctic 

 Circle, viz. Macrobiotus antarcticus, found by Professor RICHTERS in moss from the 

 Gaussberg. 



In the collections made by the German South- Polar Expedition on various islands 

 in the Southern Ocean, Professor RICHTERS has found altogether eleven species, viz. 

 Macrobiotus hufelandi, Sch., M. oberhduseri, Doy., M. tetradactylus, GreefF, M. inter- 

 medius, Plate, M. sattleri, Richters, M. echinogenitus, Richters, M. vanhoffeni, Richters, 

 M. antarcticus, Richters, Echiniscus arctomys, Ehr., E. kerguelensis, Richters, E. sp. ? 

 (not yet named). To this list I understand Professor RICHTERS will make some addi- 

 tions in a more detailed memoir to be published at an early date. EHRENBERG recorded 

 a Macrobiotus from St Paul Island as doubtfully M. hufelandi. 



The meagre materials available for the study of the Tardigrada of the Southern 

 Ocean are still sufficient to indicate a Tardigrada fauna comparable for variety with 

 that of the arctic regions, though the species yet known are not quite so numerous. 



LITERATURE CITED. 



(1) DOYERE, Ann. <L Sei. Nat., ii. Ser., 1839, T. 14, p. 286. 



(2) MURRAY, JAMES, "Tardigrada of the Scottish Lochs," Trans. Roy. Soc. Edin., vol. xli., 1905, 



pp. 677-698. 



(3) "Tardigrada of the Forth Valley," Ann. Scot. Nat. Hist., 1905, p. 160. 



(4) "Scottish Alpine Tardigrada," Ann. Scot. Nat. Hut., 1906, p. 25. 



(5) PLATE, L. H., " Naturgeschichte der Tardigraden," Zool. Jahrb., Bd. Hi., Morph. Abt., 1888, 



pp. 487-550. 



(6) RICHTERS, F., Ber. Senckenby. Nat/. Gee., 1900, p. 40. 



(7) ,, "Fauna der Umgehung von Frankfurt-a-M.," Ber. Senckenbg. Natf. Ges., 1902, 



pp. 8-13. 



(8) "Neue Moosbewohner," Ber. Senckenbg. Nafl. Ges., 1902, pp. 23, 24. 



(9) "Nordische Tardigraden," Zool. Ang., Bd. 27, 1903, p. 168. 



(10) ,, "Eier der Tardigraden," Ber. Senckenbg. Natf. Ges., 1904, p. 59. 



(11) " Verbreitung der Tardigraden," Zool. Aug., Bd. 28, 1904. p. 347. 



(12) ,, " Vorla'ufiger Bericht iiber die Antarktische Moosfauna." 



(13) "Fauna Arctica," Bd. iii., 1904, pp. 495-508. 



(14) SCHULTZE, C. A. S., "Macrobiotus hufelandi," Isis of Oken, 1834, p. 708. 



(ROY. soc. EDIN. TRANS., VOL. XLV., 333.) 



