of the Fishery Board for Scotland. 



250 



Maea Water. 



In the gathering from Maea Water nineteen species of Entomostraca 

 were obtained : they comprised seven species of Copepoda and twelve 

 species of Cladocera ; no Ostracoda were observed. The somewhat rare 

 Alona neglecta occurred here, and was the only thing of special interest 

 observed. Diaptomus wierzejsMi was more or less frequent in all the 

 three Yell lochs just described. 



(5) Unst. 



Helliers Water. 



The only addition to the Shetland fresh-water fauna obtained during 

 last season was found here. The species alluded to is Diaptomus castor 

 ( Jurine), and its occurrence in this loch is the more interesting as the only 

 other Scottish record for the species, so far as I can remember, is that pub- 

 lished in the * Annals of Scottish Natural History' for July 1892, p. 202. 

 Moreover, this discovery of Diaptomus castor in Helliers Water, Unst, 

 corroborates a remark, in the record in the ' Annals of Scottish Natural 

 History ' referred to, as to the probable distribution of the species, viz. 

 *'This Calanid was formerly considered to be a moderately common 

 species, and as a member of our fauna its distribution was believed to 

 be, and probably is, co-extensive with the British Islands." Diaptomus 

 wierzejskii also occurred in this gathering. The total number of species 

 observed was eighteen, and comprised eight species of Copepoda, nine 

 species of Cladocera, and one Ostracod {Cypria serena). There were also 

 a few beetles, water-mites, boat-flies, fragments of fresh-water sponge 

 (Spongilla), and small rounded masses of a species of Nostoc. One of 

 these masses when examined under a cover-glass formed a very pretty 

 miscroscopic object : the moniliform threads, so distinct amidst the 

 transparent mucus, appeared to intertwine in exquisite confusion. 



The subjoined Table contains a list of all the species observed in the 

 series of Shetland lochs now described, and their distribution in respect 

 of the various lochs : — 



TABLE containing the Names and showing the Distribution of all the 

 Species from the series of Shetland Lochs described in the preceding 

 Notes. 





District 

 of 



Lerwick. 



Northmavine. 



Island 

 of 



Bressay. 



Island of 

 Yell. 



Island 



of 

 Unst. 



ll Names of the Species. 



Loch of Kebister. 



Loch of Flugarth. 



Loch of 

 HouUsquey. 



Loch of 

 Benigarth. 



Moosa Water. 



Mill or Ennis 

 Loch. 



Pettidale Water. 



Innis Loch. 



Loch of 

 Kirkabister. 



Loch of 

 Colvister. 



Loch of 

 Lumbister. 



Maea Water. 



Helliers Water. 



MOLLUSCA. 



























Pisidium(? Jpusillum, Jenyns, 

 Planorbis nautileus (Linne), 

 Limncea peregra (Miiller), . 





X 

 X 















X 







X 



CRUSTACEA. 



























Amphipoda. 



























Gammarus duebeni, Lillje- 

 borg, 



„ pulex (Linne), . 







X 



X 





X 









X 







