DISTRIBUTION OF THE CLYDE CRANGONIDAE. 65 



Association, opportunities for the systematic investigation of 

 special groups in the Firth of Clyde had been few, and dredging 

 was mainly confined to the shallower waters. Prior to that time 

 the principal work carried out in the deeper waters, beyond the 

 fifty-fathom limit, was accomplished (1) by the steam-yacht, 

 " Medusa," under the direction of Sir John Murray, when 

 Dr. J. R. Henderson was enabled to carry out investigations 

 on the distribution of the Malacostraca, and was successful, not 

 only in increasing our knowledge of the distribution of many of 

 the rarer forms of the higher Crustacea, but in recording several 

 species which were new, not only to the Clyde sea-area, but to 

 the British Coasts ;* and (2) by the s.s. " Garland," belonging to 

 the Scottish Fishery Board, with which a considerable amount 

 of general investigation work was carried out from time to 

 time. The Crustacean records are embodied in Dr. Scott's list 

 of the Clyde Crustacea, already referred to. 



Since the " Mermaid " was put into commission I have been able 

 at different times to carry out investigations on the distribution 

 of the Malacostraca on systematic lines. These investigations 

 extended from the Gareloch to the southern boundary of 

 the Clyde sea-area, including all the principal lochs and a 

 considerable part of the Barrier Plateau, dredging being carried 

 out in depths down to 107 fathoms. I have been able, therefore, 

 to gather quite a fair collection in this important group of the 

 Crustacea, which has shown a much more extended distribution 

 for some of the rarer forms, and this I now propose briefly to 

 set forth. 



It may be interesting to note here that quite a number of the 

 Crustacean species, which I have been able to record from time to 

 time as having been observed apparently for the first time in 

 these waters, have been taken in depths within the twenty 

 fathom limit, so that even the shallower waters of the Clyde sea 

 area have not yet been exhausted of their biological treasures, 

 and doubtless many prizes yet await the labours of the 

 enthusiastic investigator. 



In referring to the species in these notes, I have in the 

 meantime adopted the following classification of the genera 



* Trans. Nat. Hist. Soc. Glas., Vol. I. (N. S.), p. 317. 



E 



