140 BRITISH COPEPODA. 
Moreover, it is doubtful whether some other species 
here referred to Thalestris (notably T. rufocincta) 
might not also, considering their general conformation, 
have to accompany T. peltata in any generic migra- 
tion. On these grounds I think it better, for the 
present, to ignore the genus Amenophia. I have not, 
in my single. specimen, been able to observe accurately 
the position of the eyes, and have therefore, in this 
respect, as well as in that of colour, omc y recorded 
the statements of M. Boeck. 
Genus 26. Werstwoopia, Dana, 1855. 
(Harpacticus, in part, Baird.) 
Cephalothorax large and robust; abdomen slender. 
Head and first thoracic ring coalescent; rostrum of 
moderate size; first pair of antenne 6-jointed, second 
pair 2-jointed, with a 2-joited inner branch. Man- 
dibles elongated, slender; palp consisting of a long, 
narrow, basal joint, with two small, 1-joited branches. 
First foot-jaw stout, provided with a strong terminal 
claw and three marginal, setiferous digits. Second 
foot-jaw forming a stout, grasping hand. Inner 
branch of the first foot 1l-jomted, outer branch 3- 
jointed; the first joint much elongated, second and 
third joints rudimentary and terminating in two claws. 
Both branches of second, third, and fourth pairs of 
swimmine-feet 3-jointed ; fifth pair folaceous, two 
branched. 
