200 



MR JAMES MURRAY ON 



species and one variety for Orkney. Twenty-three species and one variety are common 

 to the two groups. 



The two highest hills in the islands, Ward Hill in Hoy and Ronas Hill in Shetland, 

 were specially examined. Both are about 1500 feet in height, and thus combine high 

 latitude and considerable elevation. Saxavord Hill, in Unst, nearly 1000 feet high, and 

 close to the northernmost point of the British Islands, was also carefully studied. 





Orkney. 



Shetland. 



Philodina aculeata, Ehr. .... 





Ronas Hill, Mainland. 



,, macrostyla, Ehr. 



...... 



Mainland; Yell. 



var. tvberculata (Gosse) . 



...... 



Mainland; Yell. 



,, acutieomis, Murray . 





Ronas Hill ; Yell. 



,, brevipes, Murray 



Ward Hill," Hoy! 



Ronas Hill. 



„ flaviceps, Bryce 





Yell. 



,, nemoralis, Bryce 



Hoy ; Rousay 



Unst. 



,, rugosa, Bryce .... 



Ward Hill, Hoy. 



Ronas Hill ; Yell. 



„ alpium (Ehr.) .... 





Saxavord, Unst. 



,, brycei (Weber) .... 



Rousay .... 



Mainland. 



„ humerosa, Murray 





Mainland. 



Callidina aspera, Bryce .... 



Rousay .... 



Mainland ; Yell ; Unst. 



,, roeperi (Milne) .... 





Mainland. 



,, angusticollis, Murray . 





Saxavord, Unst. 



,, lata, Bryce .... 





Ronas Hill. 



,, pulchra, Murray 



Pomona. 





,, const ricta, Duj. .... 



Ward Hill, Hoy. 





,, tridens (Milne) .... 



Pomona. 





,, leitgebii, Zel. .... 



Hoy ; Rousay 



Saxavord, Unst. 



,, cornigera, Bryce 



Ward Hill, Hoy. 





,, plicata, Bryce .... 



Hoy ; Rousay . 



Mainland ; Yell ; Unst. 



var. hirundinella, var. no v. 



Ward Hill, Hoy . 



Ronas Hill. 



„ habit a, Bryce .... 



Ward Hill, Hoy 



Mainland. 



,, quadricomifera (Milne) 



Pomona ; Rousay 



Mainland; Yell; Unst. 



,, ehrenbergii, Janson . 



Pomona .... 



Yell; Unst. 



,, 2 m piU° sa > Thompson . 



Hoy ; Pomona ; Rousay 



Mainland. 



,, muscidosa (Milne) 



Pomona .... 



Mainland. 



,, symbiotica, Zel. 



Pomona .... 



Ronas Hill. 



,, armata, Murray 



Pomona. 





„ tetraodon, Ehr. .... 



Pomona .... 



Ronas Hill. 



,, incrassata, Murray 



Rousay .... 



Mainland. 



,, scarlatina, Ehr. 



Ward Hill, Hoy . . 



Ronas Hill. 



„ russeola, Zel. .... 



Ward Hill, Hoy 



Mainland; Unst. 



Rotifer vulgaris, Schrank .... 





Yell; Unst. 



,, macrurus, Schrank 





Ronas Hill. 



,, citrinus, Ehr. .... 





Saxavord, Unst. 



„ longirostris (Janson) 



Ward Hill, Hoy '. 



Mainland ; Unst. 



Adineta vaga (Davis) .... 



Pomona .... 



Mainland. 



var. major, Bryce 



. 



Mainland. 



,, barbata, Janson .... 



Ward Hill, Hoy 



Mainland ; Unst. 



,, gracilis, Janson .... 



Pomona .... 



Mainland. 



„ tuberculosa, Janson 





Ronas Hill. 



Notommata toruloso (Duj.) . 





Mainland. 



Diglena rosa, Gosse . . • . . 



Pomona. 



... 



,, ferox, Western .... 



• *.... 



Mainland. 



Arthroglena lutkeni, lierg. 



Pomona. 



... 



StepJimiops stylatus, Milne 



Pomona. 





„ tenellus, Bryce 



Pomona .... 



Mainland. 



