348 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW, 



numerously represented, and there is also a considerable 

 number of the Ostracoda ; but the Cladocera are represented by 

 only two species. This latter group, though frequently indi- 

 vidually numerous in the sea, and sometimes also in brackish 

 water, does not usually in such situations exhibit much variety of 

 form; but when fresh-water pools or lochs are examined, very 

 different results are obtained — the Cladocera are generally found 

 to be not only numerous individually, but are also represented 

 by a considerable number of species. 



The names of all the Entomostraca, as well as of the Amphi- 

 poda and Isopoda, obtained during our visit to Fairlie and 

 Hunterston, so far as they have been identified, will be found in 

 the annexed list. A glance at the list will show that the 

 Copepoda are represented by thirty-eight named species, several 

 of which have not previously been recorded for the Clyde; and 

 there are at least other two that appear to be undescribed. The 

 Ostracoda are represented by twenty-two species, none of which 

 is new to the Clyde, but a few of them are moderately rare. 

 The Cladocera comprise two species, as already stated. The 

 Amphipoda are also few in number, only three species being 

 observed. The Isopoda observed number eight species. This 

 makes a total of seventy- three species of Crustacea, exclusive of 

 the two or three that appear to be new, and will be described 

 later. A larger number of Amphipoda and Isopoda might have 

 been obtained had a special effort been made to collect these 

 forms, but, as the chief object of my visit was to investigate the 

 Entomostracan fauna of the place, comparatively little attention 

 was given to the other groups. 



List of the Crustacea obtained during a visit to Fairlie and 

 Hunterston, so far as they have been identified. A large propor- 

 tion of the Copepods and Ostracods obtained is from the brackish 

 water pools that have been referred to ; the others were collected 



between tide-marks. 



Copepoda. 



Eurytemora velox (Lillj.). Cycloinna gracilis, Claus. 



Cyclops hisetosus, Rehberg. Ectinosoma melaniceps, Boeck. 



serrulatus, Fischer. curticorne, Boeck. 



Jlmbriatus, Fischer. herdmani, T. and A. Scott. 



cequo7'eus, Fischer. Bradya minor, T. and A. Scott. 



