418 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



joint is furnished with five setae. The mandibles are 

 small, dilated at the base, and produced into a long curved 

 stylet-shaped seta ciliated in both margins. Basal part 

 of the anterior foot jaws stout, and produced into a long 

 slender spine, ciliated on its upper margin. There is also 

 a moderately long ciliated spine attached to the outer 

 margin, near the apex of the stout basal part. Posterior 

 foot jaws three-jointed ; last joint very short, and furnished 

 with a claw. Both branches of the first, second, and third 

 pairs of swimming feet three-jointed. The outer branches 

 of the fourth pair of feet are also three- jointed, but the 

 inner branches are composed of two joints; basal joints 

 small. The fifth pair of feet are small, and consist of a 

 single joint, furnished with two setae. The abdomen is 

 composed of four joints, the third joint being smaller than 

 any of the others. Caudal furca nearly as long as the 

 combined lengths of the last three abdominal segments. 



Remarks. — This species is a true Lichomolgus, the genus 

 being now restricted to species having the inner branches 

 of the fourth pair of feet composed of two joints. 

 Formerly the genus included other two types, which have 

 the inner branches of the fourth pair composed of one and 

 three joints respectively, as follows: — 



Pseudanthessius. Inner branches of fourth pair composed of one joint. 

 Lichomolgus. ,, ,, ,, two joints. 



Hermanella. ,, „ ,, three joints. 



Oncea venusta, Phillipi. 

 Occurrence, Nos. 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 

 16, IT, 18. 



Oncea conifer a, Giesbrecht. 

 Occurrence, Nos. 6, 11, 13, 16, 18. 



Oncea venusta has already been recorded by Mr. 

 Thompson from the Eed Sea, but it does not appear to 

 have been previously recorded from the region between 



