182 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Acartia claus, Giesbrecht. (Pl. XV, fig. 6.) 
Uength 1.45 mm. Common in the open sea. 
Giesbrecht separates A. clawsw from A. longiremis, the 
slight points of difference being chiefly in the 5th feet, the 
spinal termination of the female 5th foot of A. clawsw (6) 
being much shorter and stronger than that of A. longi- 
remis. It is probable that we may have both species but 
those I have dissected for examination all belong to the 
former. 
Acartia discaudatus, 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. clausi by the caudal segments (¢) 
which are about as broad as long. 
Temora longicorms, Muller. (Pl. 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 (>) form a suffi- 
ciently distinguishing feature. 
Eurytemora clausw, Hoek. (Pl. 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. 
Hurytemora affinis, Poppe. (Pl. 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. 
Isiasvclavipes, Bocclew (2S xQvaly tica2e) 
Length 1.60 mm. Frequently taken by townet in the 
open sea but never abundantly. 
