HIGHER CRUSTACEA OF THE FIRTH OF CLYDE. 317 



has been confined to the past year. In March 

 we carried on a series of dredgings throughout 

 the Firth; and these were repeated, though on 

 a much more extended scale, in the months of 

 July and August. During both these periods, 

 however, there were great facihties in the way of 

 collecting, our investigations being carried on con- 

 tinuously from the steam-yacht "Medusa," of the 

 Scottish Marine Station, Granton, which is fitted up 

 with all modern appliances for the work. We were 

 enabled to form extensive collections in most of the 

 invertebrate groups; and not a little of the success 

 was due to the fact that the operations were under 

 the direct superintendence of Mr. John Murray, of 

 the " Challenger " expedition. 



The naturalists who have made this district the 

 scene of their investigations, ai)pear all without 

 exception to have confined their labours to some 

 special part of the Firth, and little or no work has 

 apparently been done in the deep water beyond the 

 fifty - fathom line. In the present list 'we have 

 arranged together all the previously-known species, 

 and added to these a number which now appear 

 for the first time from the Firth of Clyde, 

 including five not previously recorded from the 

 British coasts. The distribution of the more 

 common forms has also been worked up, and 

 many new localities are added. It can hardly 

 be expected that operations carried on for so short 

 a period can have exhausted even the higher Crus- 

 tacea of so rich a district, and doubtless novelties 

 yet remain to reward the efforts of future inves- 

 tigators. 



Some of the more important features in the 

 distribution of the higher Crustacea in the Firth 

 are worthy of short notice here. Between tide- 

 marks we meet with the ubiqviitous Carcinns 

 inaenas, and this species occurs far up the estuary, 

 even where the water is brackish. It is also found 

 throughout the lochs, where, owing to the sudden 



