40 BRITISH COPEPODA. 



Genus 1. LICHOMOLGUS, Thorell (1859). 



(BoecJtia, Brady, Macrocheiron, Brady.) 



Body elongated, 'subpyriform, composed, in the male, 

 of twelve, in the female, of eleven, segments ; cephalo- 

 thorax ovate ; the head large and coalescent with the 

 first thoracic segment ; abdomen slender, first and 

 second segments united in the female, separate in the 

 male. Anterior antennae 6- or 7- jointed, alike in both 

 sexes, posterior shorter, simple, 3- or 4-jointed, and 

 bearing at the apex a few curved setae. Mandible 

 forming a slender ciliated stilet, dilated at the base, 

 but excessively slender and filiform beyond the middle ; 

 no palp. Maxilla springing from near the base of the 

 mandible, composed of a digitiform process, which 

 bears a few small setae. First pair of foot-jaws 2- 

 jointed, basal joint large, apical joint slender and 

 armed with a few terminal and marginal setae, some of 

 which are spine-like ; second pair 2-jointed, robust, in 

 the female bearing three or four spine-like setae, in the 

 male a large uncinate apical claw. First four pairs of 

 feet having both branches 3-jointed, except the fourth, 

 which has the inner branch 1- or 2-jointed ; fifth pair 

 of feet small, 1 -jointed, rudimentary. 



Animals living either free or in the branchial sacs of 

 various simple Ascidians. 



