416 Mr. T. Scott on Crustacea 



all over the North Sea, but is usually of rare occurrence on 

 the west coast of Scotland. Durin-]^ the whole of my resi- 

 dence at Tarbert, Loch Fyne, in 1885-86, the only member 

 of the Hypeviidse I observed was Ilyperia (jalha, a few speci- 

 mens of v/hich were obtained in one of the Aurelia aurita 

 that had been cast ashore by the incoming tide. Mr. David 

 Robertson states that he obtained a single specimen of Para- 

 themisto oblivia near the Mull of Cantire; and this was the 

 only one he remembers ever having met with in the Firth of 

 Clyde *. 



Eulhemisto compressa (Goes). 



Themisto compressa, Goes, (Efvers. af Kongl. Svenska Vetensk.-Akad. 



Fiirliandl. (1865). 

 Euthemisto coinpressa, G. 0. Sars, Crust, of Norway, p. 1 2, pi. v. fig. 2 



(1890). 



This is a larger species than the last, and apparently some- 

 what erratic in its movements so far as its presence on the 

 east coasts of England and Scotland is concerned. At one 

 time it may be of frequent occurrence, or even quite common, 

 while at another time not a single specimen can be obtained. 

 A few specimens only were observed in the tow-net gathering 

 from the Dogger Bank. 



Callisoma crenata^ Spence Bate. 



Ccdltsoma crenata, Spence Bate, Cat, Anipbip. Brit. Mu.'j. p. So, pi. xiv. 

 fig. 5 (1862). 



Callisoma crenata appears to be a generally distributed 

 species. If a dead half- decayed fish, sea-urchin, or such like 

 is brought up in the dredge, Callisoma crenata is almost 

 sure to be present, and sometimes in swarms, feeding on the 

 putrid animal matter. 



Hippomedon denticulatus (Spence Bate). 



Anoin/.v denticulatus, Spence Bate, Cat. Aniphip. Crust. Brit. Mus. 



p. to (1862). 

 Jli'ppomcclcn dentictdatus, G. O. Sfrs, Crust, of Nonvav, p. 06, pi. xx. 



(1890). 



This fine species was frequent in the tow-net material from 

 the Dogger l?ank. It is nadily distinguished from its allies 

 *' by the ])Oculiar form of the tooth-like posterior projection 

 of the last c]iinieral plates of the mctasome " f. 



* 'The Aniphipotlii nncl Isopoda of (lie Firth o{ Clyde,' by David 

 Kobert.^ou, K.L.S., F.G.S., p. tio (1888). 

 t (». O. Sars, op. cit. p. o7. 



