ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 289 



Arcturus lonf/icornis (Sowerby). Common. 



graalis (Goodsir). 5-8 miles off Balta, 40-50 fathoms. 



Idotea tricuspidata, Desmarest 



SpJujeroma Prideau&ianum, Leach. A single specimen. 



Cymodocea truncate (Montagu). Bare ; Bressay Sound and St. Magnus Bay. 



Ligia oceanica (Linn.). 



Oniscus asettus, Linn. 



Porcettio scaber, LatreiUe. 



These are the only terrestrial Isopoda which I have noticed ; doubtless 

 several others occur, and only require to be looked for. 



Order PHYLLOPODA. 



ffdaUa Upes (0. Fabr.). Balta Sound, 5-7 fathoms ; 5-8 miles east of Balta, 

 40-50 fathoms ; St. Magnus Bay. 



Order CLADOCEBA. 



Daphniapultx (Linn.). 



vetula, Muller. 



retieulata (Jurine). 



Bosmina longtrostris (Muller). Small lake near Lerwick. 

 AcanthoUberis curvirostris (Muller). Common, mainland and Unst. 

 Uyocryptus sordidus (Lievin). Pond back of Lerwick Xorth Loch (Mr. D. 



Kobertson). 

 Lynceus Jiarpce, Baird. Lake near Hillswick (A. M. X.) ; and near Scalloway 



(Mr. D. Kobertson). 



tlongatw (G. 0. Sars). Common. 



quadrangular is, Muller. Common. 



cxiguus, LOljeborg. Lake near Lerwick (A. M. ^.) ; and near Scalloway 



(Mr.D. Bobertson). 



trigonettus, Muller. Lake near BUlswiek. 



nanus (Baird). Pond near Scalloway (Mr. D. Bobertson). 



sphoBiicus, Muller. 



E"i-ycercus lamettatus (Muller). 



Evadne Nordmanni, Loven. Open sea, surfece-net, common. 



Pleopis polyphcmoidts, Leuckart. Less common than the last, and procured 



under similar circumstances. 



Order OSTBACODA. 



Oypris ovum (Jurine). 



compressa, Baird. 



Paracypris polita, G. 0. Sars. St Magnus Bay, 1867. 



Pontocyjpris mytttoides (Xorman). Abundant, living among Laminarix, and 

 down to 100 fathoms. 



Tiispida, G. 0. Sars, Oversigt af Gorges marine Ostracoder, 1865, 



p. 16. Yery 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 the length. 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 nafl of first feet very long and slender, exceed- 

 ing in length the four preceding joints, and greatly curved at the extre- 



