88 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Acartia clausii, Giesbrecht. (PI. XV, fig. 6.) 

 Length 1.45 mm. Common in the open sea. 

 Giesbrecht separates^, clausii from^. longiremis, the 

 slight points of difference being chiefly in the 5th feet, the 

 spinal termination of the female 5th foot of A . clausii (b) 

 being much shorter and stronger than that of A . longi- 

 reniis. It is probable that we may have both species but 

 those I have dissected for examination all belong to the 

 former. 



Acartia cliscauclatus , Giesbrecht. (PL XV, fig. 6.) 

 Length 1.'20 mm. Taken frequently off the mouth of 

 the Dee and about the Anglesea coast. It may be readily 

 distinguished from A. clausii by the caudal segments (c) 

 which are about as broad as long. 



Temora longicorms, Miiller. (PI. XV, fig. 7.) 

 Length 1.75 mm. Perhaps the most common British 

 surface species, although rarely or never taken outside 

 British waters. The caudal segments (b) form a suffi- 

 ciently distinguishing feature. 



Eurytemora clausii, Hoek. (PI. XV, fig. 8.) 

 Length 1.40 mm. Generally met with in brackish 

 water estuaries or pools and in salt marshes. Abundant 

 in pools behind Leasowe embankment. 



Eurytemora affinis, Poppe. (PI. XVI, fig. 1.) 

 Length 1.75 mm. A large number of this species were 

 taken by townet off the sandbanks at the mouth of the 

 Mersey in 1886. It was not subsequently recorded in the 

 district until 1891, when the filter beds of the Bootle 

 Corporation baths were found to be swarming with it. 

 Mr. Ascroft has since sent me specimens found in tidal 

 pools at Lytham. The males I have found are conspicu- 

 ous by the number of spermatophores attached to them. 

 Isias clavipes, Boeck. (PI. XVI, fig. 2.) 

 Length 1.60 mm. Frequently taken by townet in the 

 open sea but never abundantly. 



