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Part III. — Eighteenth Annual Report 



XL— NOTES ON SOME GATHERINGS OF CRUSTACEA COL- 

 LECTED FOR THE MOST PART ON BOARD THE 

 FISHERY STEAMER "GARLAND" AND EXAMINED 

 DURING THE PAST YEAR (1899). 



By Thomas Scott, F.L.S., Mem. Zool. Soc. de France. 



K 



(Plates XIII. and XIV.) 



The following " Notes " are intended to supplement a somewhat similar 

 series published in Part III. of the Seventeenth Annual Report. These 

 nctes deal entirely with the Crustacea, and refer to species that have been 

 observed in various gatherings of tow-net and dredged materials examined 

 during the past year, and collected for the most part on board the 

 " Garland." The majority of the species referred to have been obtained 

 in gatherings collected in Loch Fyne and in the seaward portion of the 

 Firth of Clyde, but a few are also from other parts of the Scottish coasts ; 

 moreover, with the exception of one or two brackish-water forms those 

 recorded are all marine species. 



A few of the copepods mentioned in the sequel are apparently 

 undescribed, but most of the other forms have already been recorded. 

 Further information concerning these has, however, been obtained bearing 

 on their structural details or on the distribution of the species, which it 

 will be of interest to notice. 



My sou, Mr. Andrew Scott (assisted by Mrs. Scott), has prepared 

 drawings to illustrate where necessary the various objects described. 

 Several forms other than those mentioned in the sequel have had to stand 

 over, but these will be described later. 



Copepoda. 



Eucalanus crassus, Giesbrecht. 



1888. Eucalanus crassus, Giesb., Atti Acc. Lincei, Rend. (4), 

 vol. iv„ sem. 2, p. 333. 



A considerable number of specimens of this species were obtained in a 

 bottom tow-net* gathering collected in Dornoch Firth, November 19th, 

 1898. The depth at which the tow-net was worked varied from 8 to 16 

 fathoms. A large proportion of the specimens obtained were more or 

 less immature. This Eucalanus has been obtained in the Moray Firth 

 district on several occasions during the past few years, but it was 

 apparently more frequent in the present gathering than in any of those 

 previously examined. It is somewhat difficult to distinguish the 

 immature forms of the species, but the adults are comparatively easily 

 distinguished. When it is remembered that the distribution of Eucalanus 

 crassus extends south as far at least as the Gulf of Guinea, its presence 

 in the Moray Firth from time to time is of more than usual interest. 



* What is here called the "bottom tow-net" is the tow-net that is fastened to the 

 trawl-head in such a way that when the trawl is working the tow-net just clears the sea- 

 bottom. 



