ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 289 
Arcturus longicornis (Sowerby). Common. 
gracilis (Goodsir). 5-8 miles off Balta, 40-50 fathoms. 
Idotea tricuspidata, Desmarest. 
Spheroma Prideauxianum, Leach. <A single specimen. 
Cymodocea truncata (Montagu). Rare; Bressay Sound and St. Magnus Bay. 
Ligia oceanica (Linn.). 
Oniscus asellus, Linn. 
Porcellio scaber, Latreille. 
These are the only terrestrial Isopoda which I have noticed ; doubtless 
several others occur, and only require to be looked for. 
Order PHYLLOPODA. 
Nebalia bipes (O. Fabr.). Balta Sound, 5—7 fathoms ; 5-8 miles east of Balta, 
40-50 fathoms; St. Magnus Bay. 
Order CLADOCERA. 
Daphnia pulex (Linn.). 
—— vetula, Miiller. 
—— reticulaia (Jurine). 
Bosmina longirostris (Miller). Small lake near Lerwick. 
Acantholeberis curvirostris (Miller). Common, mainland and Unst. 
Iiyocryptus sordidus (Liévin). Pond back ef Lerwick North Loch (My. D. 
Robertson). 
Lynceus harpe, Baird. Lake near Hillswick (A. M. N.); and near Scalloway 
(Mr. D. Robertson). 
elongatus (G. O, Sars). Common. 
—— quadrangularis, Miiller. Common. 
exiguus, Lilljeborg. Lake near Lerwick (A. M.N.); and near Scalloway 
(Mr. D. Robertson). 
—— trigonellus, Miller. Lake near Hillswick. 
nanus (Baird). Pond near Scalloway (Mr. D. Robertson), 
sphericus, Miiller. 
Eurycertus lamellatus (Miller). 
Evadne Nordmanni, Lovén. Open sea, surface-net, common. 
Pleopis polyphemoides, Leuckart. Less common than the last, and procured 
under similar circumstances. 
Order OSTRACODA. 
Cypris ovum (Jurine). 
compressa, Baird. 
Paracypris polita, G. O. Sars. St. Magnus Bay, 1867. 
Pontocypris mytiloides (Norman). Abundant, living among Laminarie, and 
down to 100 fathoms. 
hispida, G. O. Sars, Oversigt af Norges marine Ostracoder, 1865, 
p- 16. Very like the last, smaller, and paler in colour, of a light 
fulvous hue ; a little more produced behind, upper margin less prominent 
in front; ventral margin more concave ; seen from above much more 
tumid, width fully equalling one-third of theleneth. Surface of valves 
clothed with close-set long hair; right valve having only five serra- 
tions at the infero-posterior angle. Sars also describes the animal as 
differing in having the nail of first feet very long and slender, exceed- 
ing in length the four preceding joints, and greatly curved at the extre- 
